diff --git a/libcxx/utils/ssh.py b/libcxx/utils/ssh.py
--- a/libcxx/utils/ssh.py
+++ b/libcxx/utils/ssh.py
@@ -41,6 +41,7 @@
     parser = argparse.ArgumentParser()
     parser.add_argument('--host', type=str, required=True)
     parser.add_argument('--execdir', type=str, required=True)
+    parser.add_argument('--tempdir', type=str, required=False, default='/tmp')
     parser.add_argument('--extra-ssh-args', type=str, required=False)
     parser.add_argument('--extra-scp-args', type=str, required=False)
     parser.add_argument('--codesign_identity', type=str, required=False, default=None)
@@ -51,7 +52,7 @@
 
     # Create a temporary directory where the test will be run.
     # That is effectively the value of %T on the remote host.
-    tmp = subprocess.check_output(ssh(args, 'mktemp -d /tmp/libcxx.XXXXXXXXXX'), universal_newlines=True).strip()
+    tmp = subprocess.check_output(ssh(args, 'mktemp -d {}/libcxx.XXXXXXXXXX'.format(args.tempdir)), universal_newlines=True).strip()
 
     # HACK:
     # If an argument is a file that ends in `.tmp.exe`, assume it is the name