diff --git a/.github/workflows/python_unit_tests.yaml b/.github/workflows/python_unit_tests.yaml
index ae1d8def..bad24106 100644
--- a/.github/workflows/python_unit_tests.yaml
+++ b/.github/workflows/python_unit_tests.yaml
@@ -69,6 +69,14 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6.1.0
 
+      # The default Windows temp dir is a network disk, ~5x slower at small files than RUNNER_TEMP (apify/actor-templates#907).
+      - name: Use the runner's local disk for temp files
+        if: runner.os == 'Windows'
+        shell: bash
+        run: |
+          echo "TMP=$RUNNER_TEMP" >> "$GITHUB_ENV"
+          echo "TEMP=$RUNNER_TEMP" >> "$GITHUB_ENV"
+
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
         with: