diff --git a/homeassistant/components/number/__init__.py b/homeassistant/components/number/__init__.py
index 9c828d1a32f..dfd14f5257b 100644
--- a/homeassistant/components/number/__init__.py
+++ b/homeassistant/components/number/__init__.py
@@ -199,6 +199,14 @@ class NumberDeviceClass(StrEnum):
     Unit of measurement: `W`, `kW`
     """
 
+    PRECIPITATION = "precipitation"
+    """Precipitation.
+
+    Unit of measurement:
+    - SI / metric: `mm`
+    - USCS / imperial: `in`
+    """
+
     PRECIPITATION_INTENSITY = "precipitation_intensity"
     """Precipitation intensity.
 
diff --git a/homeassistant/components/sensor/__init__.py b/homeassistant/components/sensor/__init__.py
index 0382af7f9f8..a1a7e9ce1a7 100644
--- a/homeassistant/components/sensor/__init__.py
+++ b/homeassistant/components/sensor/__init__.py
@@ -254,6 +254,14 @@ class SensorDeviceClass(StrEnum):
     Unit of measurement: `W`, `kW`
     """
 
+    PRECIPITATION = "precipitation"
+    """Precipitation.
+
+    Unit of measurement:
+    - SI / metric: `mm`
+    - USCS / imperial: `in`
+    """
+
     PRECIPITATION_INTENSITY = "precipitation_intensity"
     """Precipitation intensity.
 
@@ -394,6 +402,7 @@ STATE_CLASSES: Final[list[str]] = [cls.value for cls in SensorStateClass]
 UNIT_CONVERTERS: dict[SensorDeviceClass | str | None, type[BaseUnitConverter]] = {
     SensorDeviceClass.DISTANCE: DistanceConverter,
     SensorDeviceClass.GAS: VolumeConverter,
+    SensorDeviceClass.PRECIPITATION: DistanceConverter,
     SensorDeviceClass.PRESSURE: PressureConverter,
     SensorDeviceClass.SPEED: SpeedConverter,
     SensorDeviceClass.TEMPERATURE: TemperatureConverter,
diff --git a/homeassistant/components/sensor/device_condition.py b/homeassistant/components/sensor/device_condition.py
index e06355dda8c..55e993f46ba 100644
--- a/homeassistant/components/sensor/device_condition.py
+++ b/homeassistant/components/sensor/device_condition.py
@@ -52,6 +52,7 @@ CONF_IS_PM10 = "is_pm10"
 CONF_IS_PM25 = "is_pm25"
 CONF_IS_POWER = "is_power"
 CONF_IS_POWER_FACTOR = "is_power_factor"
+CONF_IS_PRECIPITATION = "is_precipitation"
 CONF_IS_PRECIPITATION_INTENSITY = "is_precipitation_intensity"
 CONF_IS_PRESSURE = "is_pressure"
 CONF_IS_SPEED = "is_speed"
@@ -89,6 +90,7 @@ ENTITY_CONDITIONS = {
     SensorDeviceClass.PM1: [{CONF_TYPE: CONF_IS_PM1}],
     SensorDeviceClass.PM10: [{CONF_TYPE: CONF_IS_PM10}],
     SensorDeviceClass.PM25: [{CONF_TYPE: CONF_IS_PM25}],
+    SensorDeviceClass.PRECIPITATION: [{CONF_TYPE: CONF_IS_PRECIPITATION}],
     SensorDeviceClass.PRECIPITATION_INTENSITY: [
         {CONF_TYPE: CONF_IS_PRECIPITATION_INTENSITY}
     ],
diff --git a/homeassistant/components/sensor/device_trigger.py b/homeassistant/components/sensor/device_trigger.py
index 4f36c8b78cb..ef724881c52 100644
--- a/homeassistant/components/sensor/device_trigger.py
+++ b/homeassistant/components/sensor/device_trigger.py
@@ -51,6 +51,7 @@ CONF_PM10 = "pm10"
 CONF_PM25 = "pm25"
 CONF_POWER = "power"
 CONF_POWER_FACTOR = "power_factor"
+CONF_PRECIPITATION = "precipitation"
 CONF_PRECIPITATION_INTENSITY = "precipitation_intensity"
 CONF_PRESSURE = "pressure"
 CONF_REACTIVE_POWER = "reactive_power"
@@ -88,6 +89,7 @@ ENTITY_TRIGGERS = {
     SensorDeviceClass.PM25: [{CONF_TYPE: CONF_PM25}],
     SensorDeviceClass.POWER: [{CONF_TYPE: CONF_POWER}],
     SensorDeviceClass.POWER_FACTOR: [{CONF_TYPE: CONF_POWER_FACTOR}],
+    SensorDeviceClass.PRECIPITATION: [{CONF_TYPE: CONF_PRECIPITATION}],
     SensorDeviceClass.PRECIPITATION_INTENSITY: [
         {CONF_TYPE: CONF_PRECIPITATION_INTENSITY}
     ],
diff --git a/homeassistant/util/unit_system.py b/homeassistant/util/unit_system.py
index 7e338f8f313..6350d80f3d7 100644
--- a/homeassistant/util/unit_system.py
+++ b/homeassistant/util/unit_system.py
@@ -256,6 +256,8 @@ METRIC_SYSTEM = UnitSystem(
         ("distance", UnitOfLength.YARDS): UnitOfLength.METERS,
         # Convert non-metric volumes of gas meters
         ("gas", UnitOfVolume.CUBIC_FEET): UnitOfVolume.CUBIC_METERS,
+        # Convert non-metric precipitation
+        ("precipitation", UnitOfLength.INCHES): UnitOfLength.MILLIMETERS,
         # Convert non-metric speeds except knots to km/h
         ("speed", UnitOfSpeed.FEET_PER_SECOND): UnitOfSpeed.KILOMETERS_PER_HOUR,
         ("speed", UnitOfSpeed.MILES_PER_HOUR): UnitOfSpeed.KILOMETERS_PER_HOUR,
@@ -286,6 +288,8 @@ US_CUSTOMARY_SYSTEM = UnitSystem(
         ("distance", UnitOfLength.MILLIMETERS): UnitOfLength.INCHES,
         # Convert non-USCS volumes of gas meters
         ("gas", UnitOfVolume.CUBIC_METERS): UnitOfVolume.CUBIC_FEET,
+        # Convert non-USCS precipitation
+        ("precipitation", UnitOfLength.MILLIMETERS): UnitOfLength.INCHES,
         # Convert non-USCS speeds except knots to mph
         ("speed", UnitOfSpeed.METERS_PER_SECOND): UnitOfSpeed.MILES_PER_HOUR,
         ("speed", UnitOfSpeed.KILOMETERS_PER_HOUR): UnitOfSpeed.MILES_PER_HOUR,