diff --git a/homeassistant/components/mqtt/light/schema_json.py b/homeassistant/components/mqtt/light/schema_json.py
index 4473385d550..d18da9e917a 100644
--- a/homeassistant/components/mqtt/light/schema_json.py
+++ b/homeassistant/components/mqtt/light/schema_json.py
@@ -31,7 +31,6 @@ from homeassistant.components.light import (
     LightEntity,
     LightEntityFeature,
     brightness_supported,
-    color_supported,
     valid_supported_color_modes,
 )
 from homeassistant.const import (
@@ -293,7 +292,7 @@ class MqttLightJson(MqttEntity, LightEntity, RestoreEntity):
         elif values["state"] is None:
             self._attr_is_on = None
 
-        if color_supported(self.supported_color_modes) and "color_mode" in values:
+        if "color_mode" in values:
             self._update_color(values)
 
         if brightness_supported(self.supported_color_modes):
diff --git a/tests/components/mqtt/test_light_json.py b/tests/components/mqtt/test_light_json.py
index bcf9d4bd736..67d382826ae 100644
--- a/tests/components/mqtt/test_light_json.py
+++ b/tests/components/mqtt/test_light_json.py
@@ -432,6 +432,65 @@ async def test_brightness_only(
     assert state.state == STATE_OFF
 
 
+@pytest.mark.parametrize(
+    "hass_config",
+    [
+        {
+            mqtt.DOMAIN: {
+                light.DOMAIN: {
+                    "schema": "json",
+                    "name": "test",
+                    "state_topic": "test_light_rgb",
+                    "command_topic": "test_light_rgb/set",
+                    "supported_color_modes": ["color_temp"],
+                }
+            }
+        },
+    ],
+)
+async def test_color_temp_only(
+    hass: HomeAssistant, mqtt_mock_entry: MqttMockHAClientGenerator
+) -> None:
+    """Test a light that only support color_temp as supported color mode."""
+    await mqtt_mock_entry()
+
+    state = hass.states.get("light.test")
+    assert state.state == STATE_UNKNOWN
+    assert state.attributes.get(light.ATTR_SUPPORTED_COLOR_MODES) == [
+        light.ColorMode.COLOR_TEMP
+    ]
+    expected_features = (
+        light.LightEntityFeature.FLASH | light.LightEntityFeature.TRANSITION
+    )
+    assert state.attributes.get(ATTR_SUPPORTED_FEATURES) == expected_features
+    assert state.attributes.get("rgb_color") is None
+    assert state.attributes.get("brightness") is None
+    assert state.attributes.get("color_temp_kelvin") is None
+    assert state.attributes.get("effect") is None
+    assert state.attributes.get("xy_color") is None
+    assert state.attributes.get("hs_color") is None
+
+    async_fire_mqtt_message(
+        hass,
+        "test_light_rgb",
+        '{"state":"ON", "color_mode": "color_temp", "color_temp": 250, "brightness": 50}',
+    )
+
+    state = hass.states.get("light.test")
+    assert state.state == STATE_ON
+    assert state.attributes.get("rgb_color") == (255, 206, 166)
+    assert state.attributes.get("brightness") == 50
+    assert state.attributes.get("color_temp_kelvin") == 4000
+    assert state.attributes.get("effect") is None
+    assert state.attributes.get("xy_color") == (0.42, 0.365)
+    assert state.attributes.get("hs_color") == (26.812, 34.87)
+
+    async_fire_mqtt_message(hass, "test_light_rgb", '{"state":"OFF"}')
+
+    state = hass.states.get("light.test")
+    assert state.state == STATE_OFF
+
+
 @pytest.mark.parametrize(
     "hass_config",
     [