diff --git a/pkgs/code_assets/test/code_assets/config_test.dart b/pkgs/code_assets/test/code_assets/config_test.dart
index 6ea73a7746..31a9075600 100644
--- a/pkgs/code_assets/test/code_assets/config_test.dart
+++ b/pkgs/code_assets/test/code_assets/config_test.dart
@@ -23,7 +23,9 @@ void main() async {
   late Uri fakeVcVars;
 
   setUp(() async {
-    final tempUri = Directory.systemTemp.uri;
+    final tempUri =
+        (await Directory.systemTemp.createTemp('code assets config temp '))
+            .uri;
     outFile = tempUri.resolve('output.json');
     outputDirectoryShared = tempUri.resolve('out_shared1/');
     packageName = 'my_package';
diff --git a/pkgs/code_assets/test/code_assets/validation_test.dart b/pkgs/code_assets/test/code_assets/validation_test.dart
index 2139307538..d8dd6591e1 100644
--- a/pkgs/code_assets/test/code_assets/validation_test.dart
+++ b/pkgs/code_assets/test/code_assets/validation_test.dart
@@ -19,7 +19,8 @@ void main() {
   late Uri packageRootUri;
 
   setUp(() async {
-    tempUri = (await Directory.systemTemp.createTemp()).uri;
+    tempUri =
+        (await Directory.systemTemp.createTemp('code assets temp ')).uri;
     outDirUri = tempUri.resolve('out/');
     await Directory.fromUri(outDirUri).create();
     outDirSharedUri = tempUri.resolve('out_shared/');
diff --git a/pkgs/data_assets/test/data_assets/validation_test.dart b/pkgs/data_assets/test/data_assets/validation_test.dart
index b93475bca5..deddc699f9 100644
--- a/pkgs/data_assets/test/data_assets/validation_test.dart
+++ b/pkgs/data_assets/test/data_assets/validation_test.dart
@@ -17,7 +17,8 @@ void main() {
   late Uri packageRootUri;
 
   setUp(() async {
-    tempUri = (await Directory.systemTemp.createTemp()).uri;
+    tempUri =
+        (await Directory.systemTemp.createTemp('data assets temp ')).uri;
     outDirUri = tempUri.resolve('out/');
     await Directory.fromUri(outDirUri).create();
     outDirSharedUri = tempUri.resolve('out_shared/');
diff --git a/pkgs/ffigen/test/test_utils.dart b/pkgs/ffigen/test/test_utils.dart
index d5665b1c89..098afecceb 100644
--- a/pkgs/ffigen/test/test_utils.dart
+++ b/pkgs/ffigen/test/test_utils.dart
@@ -156,7 +156,7 @@ String configPath(String directory, String file) =>
     absPath(configPathForTest(directory, file));
 
 /// Returns the temp directory used to store bindings generated by tests.
-String tmpDir = path.join(packagePathForTests, 'test', '.temp');
+String tmpDir = path.join(packagePathForTests, 'test', '.temp with spaces');
 
 /// Generates actual file using library and tests using [expect] with expected.
 ///
diff --git a/pkgs/hooks/lib/src/test.dart b/pkgs/hooks/lib/src/test.dart
index eb2c9ed7ed..a0db9848a7 100644
--- a/pkgs/hooks/lib/src/test.dart
+++ b/pkgs/hooks/lib/src/test.dart
@@ -52,7 +52,7 @@ Future<void> testBuildHook({
   linkingEnabled ??= false;
   const keepTempKey = 'KEEP_TEMPORARY_DIRECTORIES';
 
-  final tempDir = await Directory.systemTemp.createTemp();
+  final tempDir = await Directory.systemTemp.createTemp('hooks test ');
 
   try {
     // Deal with Windows temp folder aliases.
diff --git a/pkgs/hooks/test/api/build_test.dart b/pkgs/hooks/test/api/build_test.dart
index fae5715186..9b791625da 100644
--- a/pkgs/hooks/test/api/build_test.dart
+++ b/pkgs/hooks/test/api/build_test.dart
@@ -20,7 +20,8 @@ void main() async {
   late BuildInput input;
 
   setUp(() async {
-    tempUri = (await Directory.systemTemp.createTemp()).uri;
+    tempUri = (await Directory.systemTemp.createTemp('hooks api temp '))
+        .uri;
     outFile = tempUri.resolve('output.json');
     outDirUri = tempUri.resolve('out1/');
     await Directory.fromUri(outDirUri).create();
diff --git a/pkgs/hooks/test/build_input_test.dart b/pkgs/hooks/test/build_input_test.dart
index c8ea74ce1e..50259ab8df 100644
--- a/pkgs/hooks/test/build_input_test.dart
+++ b/pkgs/hooks/test/build_input_test.dart
@@ -20,7 +20,9 @@ void main() async {
   late Map<String, Object?> inputJson;
 
   setUp(() async {
-    final tempUri = Directory.systemTemp.uri;
+    final tempUri =
+        (await Directory.systemTemp.createTemp('hooks build_input temp '))
+            .uri;
     outFile = tempUri.resolve('output.json');
     outDirUri = tempUri.resolve('out1/');
     outputDirectoryShared = tempUri.resolve('out_shared1/');
diff --git a/pkgs/hooks/test/example/native_add_library_test.dart b/pkgs/hooks/test/example/native_add_library_test.dart
index 3efe75d83e..e9738045bc 100644
--- a/pkgs/hooks/test/example/native_add_library_test.dart
+++ b/pkgs/hooks/test/example/native_add_library_test.dart
@@ -19,7 +19,8 @@ void main() async {
   const name = 'native_add_library';
 
   setUp(() async {
-    tempUri = (await Directory.systemTemp.createTemp()).uri;
+    tempUri = (await Directory.systemTemp.createTemp('hooks example temp '))
+        .uri;
   });
 
   tearDown(() async {
diff --git a/pkgs/hooks/test/example/native_dynamic_linking_test.dart b/pkgs/hooks/test/example/native_dynamic_linking_test.dart
index 27c4ad2dbb..4e9c56a624 100644
--- a/pkgs/hooks/test/example/native_dynamic_linking_test.dart
+++ b/pkgs/hooks/test/example/native_dynamic_linking_test.dart
@@ -23,7 +23,8 @@ void main() async {
   const name = 'native_dynamic_linking';
 
   setUp(() async {
-    tempUri = (await Directory.systemTemp.createTemp()).uri;
+    tempUri = (await Directory.systemTemp.createTemp('hooks example temp '))
+        .uri;
   });
 
   tearDown(() async {
diff --git a/pkgs/hooks/test/helpers.dart b/pkgs/hooks/test/helpers.dart
index 1a65f31688..7fea9715a9 100644
--- a/pkgs/hooks/test/helpers.dart
+++ b/pkgs/hooks/test/helpers.dart
@@ -18,7 +18,10 @@ Future<void> inTempDir(
   String? prefix,
   bool keepTemp = false,
 }) async {
-  final tempDir = await Directory.systemTemp.createTemp(prefix);
+  final basePrefix = prefix ?? 'hooks_test';
+  final effectivePrefix =
+      basePrefix.contains(' ') ? basePrefix : '$basePrefix with spaces ';
+  final tempDir = await Directory.systemTemp.createTemp(effectivePrefix);
   // Deal with Windows temp folder aliases.
   final tempUri = Directory(
     await tempDir.resolveSymbolicLinks(),
diff --git a/pkgs/hooks/test/link_input_test.dart b/pkgs/hooks/test/link_input_test.dart
index 25925702b0..bf35e79a0f 100644
--- a/pkgs/hooks/test/link_input_test.dart
+++ b/pkgs/hooks/test/link_input_test.dart
@@ -18,7 +18,9 @@ void main() async {
   late Map<String, Object?> inputJson;
 
   setUp(() async {
-    final tempUri = Directory.systemTemp.uri;
+    final tempUri =
+        (await Directory.systemTemp.createTemp('hooks link_input temp '))
+            .uri;
     outFile = tempUri.resolve('output.json');
     outDirUri = tempUri.resolve('out1/');
     outputDirectoryShared = tempUri.resolve('out_shared1/');
diff --git a/pkgs/hooks/test/validation_test.dart b/pkgs/hooks/test/validation_test.dart
index 810f38d5e4..65051706b9 100644
--- a/pkgs/hooks/test/validation_test.dart
+++ b/pkgs/hooks/test/validation_test.dart
@@ -15,7 +15,8 @@ void main() {
   late Uri packageRootUri;
 
   setUp(() async {
-    tempUri = (await Directory.systemTemp.createTemp()).uri;
+    tempUri = (await Directory.systemTemp.createTemp('hooks test temp '))
+        .uri;
     outDirUri = tempUri.resolve('out/');
     await Directory.fromUri(outDirUri).create();
     outDirSharedUri = tempUri.resolve('out_shared/');
diff --git a/pkgs/hooks_runner/test/helpers.dart b/pkgs/hooks_runner/test/helpers.dart
index 00ec3fb2c2..4aba06f446 100644
--- a/pkgs/hooks_runner/test/helpers.dart
+++ b/pkgs/hooks_runner/test/helpers.dart
@@ -33,7 +33,10 @@ Future<void> inTempDir(
   String? prefix,
   bool keepTemp = false,
 }) async {
-  final tempDir = await Directory.systemTemp.createTemp(prefix);
+  final basePrefix = prefix ?? 'hooks_runner_test';
+  final effectivePrefix =
+      basePrefix.contains(' ') ? basePrefix : '$basePrefix with spaces ';
+  final tempDir = await Directory.systemTemp.createTemp(effectivePrefix);
   // Deal with Windows temp folder aliases.
   final tempUri = Directory(
     await tempDir.resolveSymbolicLinks(),
@@ -58,7 +61,10 @@ Future<void> inTempDir(
 }
 
 Future<Uri> tempDirForTest({String? prefix, bool keepTemp = false}) async {
-  final tempDir = await Directory.systemTemp.createTemp(prefix);
+  final basePrefix = prefix ?? 'hooks_runner_test';
+  final effectivePrefix =
+      basePrefix.contains(' ') ? basePrefix : '$basePrefix with spaces ';
+  final tempDir = await Directory.systemTemp.createTemp(effectivePrefix);
   // Deal with Windows temp folder aliases.
   final tempUri = Directory(
     await tempDir.resolveSymbolicLinks(),
diff --git a/pkgs/jni/bin/setup.dart b/pkgs/jni/bin/setup.dart
index 0c38dea7b9..8ba102380c 100644
--- a/pkgs/jni/bin/setup.dart
+++ b/pkgs/jni/bin/setup.dart
@@ -267,7 +267,8 @@ void main(List<String> arguments) async {
     final jniDirUri = Uri.directory('.dart_tool').resolve('jni');
     final jniDir = Directory.fromUri(jniDirUri);
     await jniDir.create(recursive: true);
-    final tempDir = await jniDir.createTemp('jni_native_build_');
+    final tempDir =
+        await jniDir.createTemp('jni native build ');
     final cmakeArgs = <String>[];
     cmakeArgs.addAll(options.cmakeArgs);
 
diff --git a/pkgs/jni/tool/generate_ide_files.dart b/pkgs/jni/tool/generate_ide_files.dart
index a973d245d1..a4d71a47a2 100644
--- a/pkgs/jni/tool/generate_ide_files.dart
+++ b/pkgs/jni/tool/generate_ide_files.dart
@@ -45,7 +45,8 @@ void main(List<String> arguments) {
     return;
   }
   final generator = cmakeGeneratorNames[argResults['generator']];
-  final tempDir = Directory.current.createTempSync('clangd_setup_temp_');
+  final tempDir =
+      Directory.current.createTempSync('clangd setup temp ');
   final src = Directory.current.uri.resolve('src/');
   try {
     runCommand(
diff --git a/pkgs/jnigen/lib/src/tools/gradle_tools.dart b/pkgs/jnigen/lib/src/tools/gradle_tools.dart
index afe2f9e187..96767da782 100644
--- a/pkgs/jnigen/lib/src/tools/gradle_tools.dart
+++ b/pkgs/jnigen/lib/src/tools/gradle_tools.dart
@@ -45,7 +45,7 @@ class GradleTools {
       deps,
       targetPath,
     );
-    final tempDir = await currentDir.createTemp('maven_temp_');
+    final tempDir = await currentDir.createTemp('maven temp ');
     await createStubProject(tempDir);
     final tempGradle = join(tempDir.path, 'temp_build.gradle.kts');
     log.finer('using Gradle stub:\n$gradle');
diff --git a/pkgs/jnigen/test/generation_test.dart b/pkgs/jnigen/test/generation_test.dart
index f5c065038b..f7a4afe36a 100644
--- a/pkgs/jnigen/test/generation_test.dart
+++ b/pkgs/jnigen/test/generation_test.dart
@@ -10,7 +10,8 @@ import 'package:test/test.dart';
 
 void main() {
   test('Warn if non-jnigen-generated files exist in directory', () async {
-    final root = await Directory.current.createTemp();
+    final root =
+        await Directory.current.createTemp('jnigen generation test ');
     final nonGenerated =
         await File.fromUri(root.uri.resolve('non_gen.dart')).create();
     await nonGenerated.writeAsString('void main() {}');
diff --git a/pkgs/jnigen/test/test_util/bindings_test_setup.dart b/pkgs/jnigen/test/test_util/bindings_test_setup.dart
index 508fc66acc..c90bc87d81 100644
--- a/pkgs/jnigen/test/test_util/bindings_test_setup.dart
+++ b/pkgs/jnigen/test/test_util/bindings_test_setup.dart
@@ -32,7 +32,9 @@ Future<void> bindingsTestSetup() async {
     'jni:setup',
   ]);
   tempClassDir =
-      Directory.current.createTempSync('jnigen_runtime_test_classpath_');
+      Directory.current.createTempSync(
+        'jnigen_runtime_test_classpath with spaces ',
+      );
   await compileJavaFiles(Directory(simplePackageTestJava), tempClassDir);
   await runCommand('dart', [
     'run',
diff --git a/pkgs/jnigen/test/test_util/test_util.dart b/pkgs/jnigen/test/test_util/test_util.dart
index cb74c7f9a4..1db00b10e4 100644
--- a/pkgs/jnigen/test/test_util/test_util.dart
+++ b/pkgs/jnigen/test/test_util/test_util.dart
@@ -19,7 +19,10 @@ const largeTestTag = 'large_test';
 const summarizerTestTag = 'summarizer_test';
 
 Directory getTempDir(String prefix) {
-  return _currentDirectory.createTempSync(prefix);
+  final basePrefix = prefix.isEmpty ? 'jnigen_test_temp' : prefix;
+  final effectivePrefix =
+      basePrefix.contains(' ') ? basePrefix : '$basePrefix with spaces ';
+  return _currentDirectory.createTempSync(effectivePrefix);
 }
 
 Future<bool> isEmptyOrNotExistDir(String path) async {
@@ -117,7 +120,8 @@ Future<void> generateAndCompareBindings(Config config) async {
   final dartReferenceBindings =
       config.outputConfig.dartConfig.path.toFilePath();
   final currentDir = Directory.current;
-  final tempDir = currentDir.createTempSync('jnigen_test_temp');
+  final tempDir =
+      currentDir.createTempSync('jnigen_test_temp with spaces ');
   final singleFile =
       config.outputConfig.dartConfig.structure == OutputStructure.singleFile;
   final tempLib = singleFile
@@ -133,7 +137,8 @@ Future<void> generateAndCompareBindings(Config config) async {
 
 Future<void> generateAndAnalyzeBindings(Config config,
     {Iterable<String> confirmExists = const []}) async {
-  final tempDir = Directory.current.createTempSync('jnigen_test_temp');
+  final tempDir =
+      Directory.current.createTempSync('jnigen_test_temp with spaces ');
   try {
     await _generateTempBindings(config, tempDir);
     final analyzeResult = Process.runSync('dart', ['analyze', tempDir.path]);
diff --git a/pkgs/native_doc_dartifier/lib/src/code_processor.dart b/pkgs/native_doc_dartifier/lib/src/code_processor.dart
index ec087e2d7f..8bed20d814 100644
--- a/pkgs/native_doc_dartifier/lib/src/code_processor.dart
+++ b/pkgs/native_doc_dartifier/lib/src/code_processor.dart
@@ -9,7 +9,8 @@ class CodeProcessor {
   final String _dartifiedCodeFileName = 'dartified_code.dart';
   final String _helperCodeFileName = 'helper_code.dart';
 
-  CodeProcessor() : _tempDir = Directory('${Directory.current.path}/temp') {
+  CodeProcessor()
+      : _tempDir = Directory('${Directory.current.path}/temp dir') {
     if (!_tempDir.existsSync()) {
       _tempDir.createSync(recursive: true);
     }
diff --git a/pkgs/native_toolchain_c/test/helpers.dart b/pkgs/native_toolchain_c/test/helpers.dart
index 4485ef5049..2b34f887a3 100644
--- a/pkgs/native_toolchain_c/test/helpers.dart
+++ b/pkgs/native_toolchain_c/test/helpers.dart
@@ -45,7 +45,10 @@ String testSuffix(List<Object> tags) => switch (tags) {
 const keepTempKey = 'KEEP_TEMPORARY_DIRECTORIES';
 
 Future<Uri> tempDirForTest({String? prefix, bool keepTemp = false}) async {
-  final tempDir = await Directory.systemTemp.createTemp(prefix);
+  final basePrefix = prefix ?? 'native_toolchain_c_test';
+  final effectivePrefix =
+      basePrefix.contains(' ') ? basePrefix : '$basePrefix with spaces ';
+  final tempDir = await Directory.systemTemp.createTemp(effectivePrefix);
   // Deal with Windows temp folder aliases.
   final tempUri = Directory(
     await tempDir.resolveSymbolicLinks(),
diff --git a/pkgs/objective_c/test/hook_build_path_test.dart b/pkgs/objective_c/test/hook_build_path_test.dart
index ee08fe490f..778bfd0de7 100644
--- a/pkgs/objective_c/test/hook_build_path_test.dart
+++ b/pkgs/objective_c/test/hook_build_path_test.dart
@@ -17,7 +17,7 @@ void main() {
     'build hook decodes percent-encoded package root paths',
     () async {
       final tempDir = await Directory.systemTemp.createTemp(
-        'objective_c_hook_path',
+        'objective_c_hook path',
       );
       addTearDown(() => tempDir.delete(recursive: true));
 
diff --git a/pkgs/swift2objc/lib/src/config.dart b/pkgs/swift2objc/lib/src/config.dart
index 4899983c1c..ab0fd5b401 100644
--- a/pkgs/swift2objc/lib/src/config.dart
+++ b/pkgs/swift2objc/lib/src/config.dart
@@ -6,7 +6,7 @@ import 'package:path/path.dart' as path;
 
 import 'ast/_core/interfaces/declaration.dart';
 
-const defaultTempDirPrefix = 'swift2objc_temp_';
+const defaultTempDirPrefix = 'swift2objc temp_';
 const symbolgraphFileSuffix = '.symbols.json';
 
 class Command {
diff --git a/pkgs/swift2objc/test/integration/integration_test.dart b/pkgs/swift2objc/test/integration/integration_test.dart
index 0a6f6c0757..8263f99a5d 100644
--- a/pkgs/swift2objc/test/integration/integration_test.dart
+++ b/pkgs/swift2objc/test/integration/integration_test.dart
@@ -27,7 +27,7 @@ void main([List<String>? args]) {
   const outputSuffix = '_output.swift';
 
   final thisDir = path.join(testDir, 'integration');
-  final tempDir = path.join(thisDir, 'temp');
+  final tempDir = path.join(thisDir, 'temp dir');
 
   var regen = false;
   final testNames = <String>[];
diff --git a/pkgs/swift2objc/test/unit/filter_test.dart b/pkgs/swift2objc/test/unit/filter_test.dart
index aefc6301ca..df248374bd 100644
--- a/pkgs/swift2objc/test/unit/filter_test.dart
+++ b/pkgs/swift2objc/test/unit/filter_test.dart
@@ -20,7 +20,7 @@ void main([List<String>? args]) {
 
   group('Unit test for filter', () {
     final thisDir = p.join(testDir, 'unit');
-    final tempDir = p.join(thisDir, 'temp');
+    final tempDir = p.join(thisDir, 'temp dir');
     final inputFile = p.join(thisDir, 'filter_test_input.swift');
 
     void filterTest(
diff --git a/pkgs/swift2objc/test/utils.dart b/pkgs/swift2objc/test/utils.dart
index a80b7dc4ab..592e5d4edf 100644
--- a/pkgs/swift2objc/test/utils.dart
+++ b/pkgs/swift2objc/test/utils.dart
@@ -31,7 +31,10 @@ Future<void> expectValidSwift(List<String> files) async {
       '-emit-symbol-graph-dir',
       '.',
     ],
-    workingDirectory: Directory.systemTemp.createTempSync().absolute.path,
+    workingDirectory:
+        Directory.systemTemp.createTempSync('swift2objc swiftc temp ')
+            .absolute
+            .path,
   );
 
   if (processResult.exitCode != 0) {
diff --git a/pkgs/swiftgen/example/generate_code.dart b/pkgs/swiftgen/example/generate_code.dart
index f85b532e19..619b03653e 100644
--- a/pkgs/swiftgen/example/generate_code.dart
+++ b/pkgs/swiftgen/example/generate_code.dart
@@ -51,7 +51,7 @@ Future<void> main() async {
         ),
       ),
     ),
-  ).generate(logger: logger, tempDirectory: Uri.directory('temp'));
+  ).generate(logger: logger, tempDirectory: Uri.directory('temp dir'));
 
   final result = Process.runSync('swiftc', [
     '-emit-library',
diff --git a/pkgs/swiftgen/lib/src/util.dart b/pkgs/swiftgen/lib/src/util.dart
index 9f180009bd..076266f77e 100644
--- a/pkgs/swiftgen/lib/src/util.dart
+++ b/pkgs/swiftgen/lib/src/util.dart
@@ -22,4 +22,6 @@ Future<void> run(
 }
 
 Uri createTempDirectory() =>
-    Uri.directory(Directory.systemTemp.createTempSync().path);
+    Uri.directory(
+      Directory.systemTemp.createTempSync('swiftgen temp ').path,
+    );
diff --git a/pkgs/swiftgen/test/integration/util.dart b/pkgs/swiftgen/test/integration/util.dart
index 2f76de7dea..ea41684a38 100644
--- a/pkgs/swiftgen/test/integration/util.dart
+++ b/pkgs/swiftgen/test/integration/util.dart
@@ -42,7 +42,7 @@ class TestGenerator {
   TestGenerator(this.name)
     : isObjCCompatible = objCCompatibleTests.contains(name) {
     testDir = path.absolute(path.join(pkgDir, 'test/integration'));
-    tempDir = path.join(testDir, 'temp');
+  tempDir = path.join(testDir, 'temp dir');
     inputFile = path.join(testDir, '$name.swift');
     wrapperFile = path.join(tempDir, '${name}_wrapper.swift');
     outputFile = path.join(tempDir, '${name}_output.dart');