Add kPa as a valid unit of measurement for pressure in weather entity (#165519)

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

homeassistant/components/weather/const.py

@@ -81,6 +81,7 @@ INTENT_GET_WEATHER = "HassGetWeather"
 
 VALID_UNITS_PRESSURE: set[str] = {
     UnitOfPressure.HPA,
+    UnitOfPressure.KPA,
     UnitOfPressure.MBAR,
     UnitOfPressure.INHG,
     UnitOfPressure.MMHG,

homeassistant/components/weather/significant_change.py

@@ -145,6 +145,8 @@ def async_check_significant_change(
                 UnitOfPressure.MMHG,  # 1hPa = 0.75mmHg
             ):
                 absolute_change = 1.0
+            elif unit == UnitOfPressure.KPA:  # 1hPa = 0.1 kPa
+                absolute_change = 0.1
             elif unit == UnitOfPressure.INHG:  # 1hPa = 0.03inHg
                 absolute_change = 0.05
 

tests/components/weather/test_significant_change.py

@@ -168,6 +168,14 @@ async def test_significant_state_change() -> None:
             },
             False,
         ),
+        (
+            {ATTR_WEATHER_PRESSURE: 100},
+            {
+                ATTR_WEATHER_PRESSURE: 100.09,
+                ATTR_WEATHER_PRESSURE_UNIT: UnitOfPressure.KPA,
+            },
+            False,
+        ),
         (
             {ATTR_WEATHER_PRESSURE: 29.5},
             {
@@ -280,6 +288,14 @@ async def test_significant_state_change() -> None:
             },
             True,
         ),
+        (
+            {ATTR_WEATHER_PRESSURE: 100},
+            {
+                ATTR_WEATHER_PRESSURE: 100.11,
+                ATTR_WEATHER_PRESSURE_UNIT: UnitOfPressure.KPA,
+            },
+            True,
+        ),
         (
             {ATTR_WEATHER_PRESSURE: 29.5},
             {

tests/components/weather/test_websocket_api.py

@@ -30,7 +30,7 @@ async def test_device_class_units(
     assert msg["result"] == {
         "units": {
             "precipitation_unit": ["in", "mm"],
-            "pressure_unit": ["hPa", "inHg", "mbar", "mmHg"],
+            "pressure_unit": ["hPa", "inHg", "kPa", "mbar", "mmHg"],
             "temperature_unit": ["°C", "°F"],
             "visibility_unit": ["km", "mi"],
             "wind_speed_unit": ["Beaufort", "ft/s", "km/h", "kn", "m/s", "mph"],