diff --git a/homeassistant/components/control4/climate.py b/homeassistant/components/control4/climate.py
index 2640a5cd02c63f..afc45d33aba01a 100644
--- a/homeassistant/components/control4/climate.py
+++ b/homeassistant/components/control4/climate.py
@@ -272,7 +272,10 @@ def current_humidity(self) -> int | None:
         if data is None:
             return None
         humidity = data.get(CONTROL4_HUMIDITY)
-        return int(humidity) if humidity is not None else None
+        try:
+            return int(humidity) if humidity is not None else None
+        except ValueError, TypeError:
+            return None
 
     @property
     def hvac_mode(self) -> HVACMode:
diff --git a/tests/components/control4/test_climate.py b/tests/components/control4/test_climate.py
index c77ebee1f654b0..d7e348db9bb59e 100644
--- a/tests/components/control4/test_climate.py
+++ b/tests/components/control4/test_climate.py
@@ -385,6 +385,40 @@ async def test_climate_missing_variables(
     assert state.attributes["temperature"] == 68.0
 
 
+@pytest.mark.parametrize(
+    "mock_climate_variables",
+    [
+        {
+            123: {
+                "HVAC_STATE": "Off",
+                "HVAC_MODE": "Heat",
+                "TEMPERATURE_F": 72.0,
+                "HUMIDITY": "Undefined",
+                "COOL_SETPOINT_F": 75.0,
+                "HEAT_SETPOINT_F": 68.0,
+                "SCALE": "FAHRENHEIT",
+            }
+        }
+    ],
+)
+@pytest.mark.usefixtures(
+    "mock_c4_account",
+    "mock_c4_director",
+    "mock_climate_update_variables",
+    "init_integration",
+)
+async def test_climate_undefined_humidity(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test climate entity handles 'Undefined' humidity string gracefully."""
+    state = hass.states.get(ENTITY_ID)
+    assert state is not None
+    assert state.state == HVACMode.HEAT
+    assert state.attributes.get("current_temperature") == 72.0
+    assert state.attributes.get("current_humidity") is None
+
+
 @pytest.mark.parametrize(
     "mock_climate_variables",
     [