diff --git a/xarray/tests/test_backends.py b/xarray/tests/test_backends.py
index 5f8ba83c330..a4585985bdc 100644
--- a/xarray/tests/test_backends.py
+++ b/xarray/tests/test_backends.py
@@ -3548,6 +3548,7 @@ def test_uamiv_format_mfread(self):
         assert_allclose(expected, actual)
         camxfile.close()
 
+    @pytest.mark.xfail(reason="Flaky; see GH3711")
     def test_uamiv_format_write(self):
         fmtkw = {"format": "uamiv"}
 
diff --git a/xarray/tests/test_cftime_offsets.py b/xarray/tests/test_cftime_offsets.py
index 343e059f53c..2352f9e8cdd 100644
--- a/xarray/tests/test_cftime_offsets.py
+++ b/xarray/tests/test_cftime_offsets.py
@@ -1176,6 +1176,7 @@ def test_dayofweek_after_cftime_range(freq):
     np.testing.assert_array_equal(result, expected)
 
 
+@pytest.mark.xfail(reason="See GH3885")
 @pytest.mark.parametrize("freq", ["A", "M", "D"])
 def test_dayofyear_after_cftime_range(freq):
     pytest.importorskip("cftime", minversion="1.0.2.1")