diff --git a/ecowitt2mqtt/const.py b/ecowitt2mqtt/const.py
index 40a46fa3..547f6274 100644
--- a/ecowitt2mqtt/const.py
+++ b/ecowitt2mqtt/const.py
@@ -117,6 +117,7 @@
 DATA_POINT_SIMMER_ZONE: Final = "simmerzone"
 DATA_POINT_SOLARRADIATION: Final = "solarradiation"
 DATA_POINT_SOLARRADIATION_PERCEIVED: Final = "solarradiation_perceived"
+DATA_POINT_S_RAIN_PIEZO: Final = "srain_piezo"
 DATA_POINT_TEMP: Final = "temp"
 DATA_POINT_TEMPIN: Final = "tempin"
 DATA_POINT_TF_CO2: Final = "tf_co2"
diff --git a/ecowitt2mqtt/data.py b/ecowitt2mqtt/data.py
index 7cf530ba..de12f396 100644
--- a/ecowitt2mqtt/data.py
+++ b/ecowitt2mqtt/data.py
@@ -49,6 +49,7 @@
     DATA_POINT_RELATIVE_STRAIN_INDEX,
     DATA_POINT_RELATIVE_STRAIN_INDEX_PERCEPTION,
     DATA_POINT_RUNTIME,
+    DATA_POINT_S_RAIN_PIEZO,
     DATA_POINT_SAFE_EXPOSURE_TIME_SKIN_TYPE_1,
     DATA_POINT_SAFE_EXPOSURE_TIME_SKIN_TYPE_2,
     DATA_POINT_SAFE_EXPOSURE_TIME_SKIN_TYPE_3,
@@ -95,6 +96,7 @@
     PrecipitationRateCalculator,
 )
 from ecowitt2mqtt.helpers.calculator.pressure import PressureCalculator
+from ecowitt2mqtt.helpers.calculator.rainstate import RainStateCalculator
 from ecowitt2mqtt.helpers.calculator.temperature import (
     DewPointCalculator,
     FeelsLikeCalculator,
@@ -170,6 +172,7 @@
     DATA_POINT_RELATIVE_STRAIN_INDEX_PERCEPTION: RsiPerceptionCalculator,
     DATA_POINT_RUNTIME: RuntimeCalculator,
     DATA_POINT_R_RAIN_PIEZO: PrecipitationRateCalculator,
+    DATA_POINT_S_RAIN_PIEZO: RainStateCalculator,
     DATA_POINT_SAFE_EXPOSURE_TIME_SKIN_TYPE_1: SafeExposureCalculator,
     DATA_POINT_SAFE_EXPOSURE_TIME_SKIN_TYPE_2: SafeExposureCalculator,
     DATA_POINT_SAFE_EXPOSURE_TIME_SKIN_TYPE_3: SafeExposureCalculator,
diff --git a/ecowitt2mqtt/helpers/calculator/rainstate.py b/ecowitt2mqtt/helpers/calculator/rainstate.py
new file mode 100644
index 00000000..8ac77e71
--- /dev/null
+++ b/ecowitt2mqtt/helpers/calculator/rainstate.py
@@ -0,0 +1,41 @@
+"""Define rain state calculators."""
+
+from __future__ import annotations
+
+from ecowitt2mqtt.backports.enum import StrEnum
+from ecowitt2mqtt.helpers.calculator import (
+    CalculatedDataPoint,
+    Calculator,
+    DataPointType,
+)
+from ecowitt2mqtt.helpers.typing import PreCalculatedValueType
+
+
+class RainState(StrEnum):
+    """Define types of rain state configuration."""
+
+    OFF = "Dry"
+    ON = "Wet"
+
+
+class RainStateCalculator(Calculator):
+    """Define a boolean rain state calculator."""
+
+    def calculate_from_value(
+        self, value: PreCalculatedValueType
+    ) -> CalculatedDataPoint:
+        """Perform the calculation.
+
+        Args:
+            value: calculated value.
+
+        Returns:
+            A parsed CalculatedDataPoint object.
+        """
+        if value == 0.0:
+            return self.get_calculated_data_point(
+                RainState.OFF, data_type=DataPointType.BOOLEAN
+            )
+        return self.get_calculated_data_point(
+            RainState.ON, data_type=DataPointType.BOOLEAN
+        )