diff --git a/.coveragerc b/.coveragerc
index 52350a498d9..d160efb776c 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -410,6 +410,7 @@ omit =
     homeassistant/components/gardena_bluetooth/const.py
     homeassistant/components/gardena_bluetooth/coordinator.py
     homeassistant/components/gardena_bluetooth/number.py
+    homeassistant/components/gardena_bluetooth/sensor.py
     homeassistant/components/gardena_bluetooth/switch.py
     homeassistant/components/gc100/*
     homeassistant/components/geniushub/*
diff --git a/homeassistant/components/gardena_bluetooth/__init__.py b/homeassistant/components/gardena_bluetooth/__init__.py
index 2954a5fe377..98869019d29 100644
--- a/homeassistant/components/gardena_bluetooth/__init__.py
+++ b/homeassistant/components/gardena_bluetooth/__init__.py
@@ -20,7 +20,7 @@ import homeassistant.util.dt as dt_util
 from .const import DOMAIN
 from .coordinator import Coordinator, DeviceUnavailable
 
-PLATFORMS: list[Platform] = [Platform.NUMBER, Platform.SWITCH]
+PLATFORMS: list[Platform] = [Platform.NUMBER, Platform.SENSOR, Platform.SWITCH]
 LOGGER = logging.getLogger(__name__)
 TIMEOUT = 20.0
 DISCONNECT_DELAY = 5
diff --git a/homeassistant/components/gardena_bluetooth/coordinator.py b/homeassistant/components/gardena_bluetooth/coordinator.py
index fa7639dece0..997c78d0f00 100644
--- a/homeassistant/components/gardena_bluetooth/coordinator.py
+++ b/homeassistant/components/gardena_bluetooth/coordinator.py
@@ -80,7 +80,7 @@ class Coordinator(DataUpdateCoordinator[dict[str, bytes]]):
                 ) from exception
         return data
 
-    def read_cached(
+    def get_cached(
         self, char: Characteristic[CharacteristicType]
     ) -> CharacteristicType | None:
         """Read cached characteristic."""
diff --git a/homeassistant/components/gardena_bluetooth/sensor.py b/homeassistant/components/gardena_bluetooth/sensor.py
new file mode 100644
index 00000000000..0c8558419e2
--- /dev/null
+++ b/homeassistant/components/gardena_bluetooth/sensor.py
@@ -0,0 +1,125 @@
+"""Support for switch entities."""
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from datetime import datetime, timedelta, timezone
+
+from gardena_bluetooth.const import Battery, Valve
+from gardena_bluetooth.parse import Characteristic
+
+from homeassistant.components.sensor import (
+    SensorDeviceClass,
+    SensorEntity,
+    SensorEntityDescription,
+    SensorStateClass,
+)
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import PERCENTAGE, EntityCategory
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+import homeassistant.util.dt as dt_util
+
+from .const import DOMAIN
+from .coordinator import Coordinator, GardenaBluetoothEntity
+
+
+@dataclass
+class GardenaBluetoothSensorEntityDescription(SensorEntityDescription):
+    """Description of entity."""
+
+    char: Characteristic = field(default_factory=lambda: Characteristic(""))
+
+
+DESCRIPTIONS = (
+    GardenaBluetoothSensorEntityDescription(
+        key=Valve.activation_reason.uuid,
+        translation_key="activation_reason",
+        state_class=SensorStateClass.MEASUREMENT,
+        entity_category=EntityCategory.DIAGNOSTIC,
+        entity_registry_enabled_default=False,
+        char=Valve.activation_reason,
+    ),
+    GardenaBluetoothSensorEntityDescription(
+        key=Battery.battery_level.uuid,
+        state_class=SensorStateClass.MEASUREMENT,
+        device_class=SensorDeviceClass.BATTERY,
+        entity_category=EntityCategory.DIAGNOSTIC,
+        native_unit_of_measurement=PERCENTAGE,
+        char=Battery.battery_level,
+    ),
+)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant, entry: ConfigEntry, async_add_entities: AddEntitiesCallback
+) -> None:
+    """Set up Gardena Bluetooth sensor based on a config entry."""
+    coordinator: Coordinator = hass.data[DOMAIN][entry.entry_id]
+    entities: list[GardenaBluetoothEntity] = [
+        GardenaBluetoothSensor(coordinator, description)
+        for description in DESCRIPTIONS
+        if description.key in coordinator.characteristics
+    ]
+    entities.append(GardenaBluetoothRemainSensor(coordinator))
+    async_add_entities(entities)
+
+
+class GardenaBluetoothSensor(GardenaBluetoothEntity, SensorEntity):
+    """Representation of a sensor."""
+
+    entity_description: GardenaBluetoothSensorEntityDescription
+
+    def __init__(
+        self,
+        coordinator: Coordinator,
+        description: GardenaBluetoothSensorEntityDescription,
+    ) -> None:
+        """Initialize the sensor."""
+        super().__init__(coordinator, {description.key})
+        self._attr_native_value = None
+        self._attr_unique_id = f"{coordinator.address}-{description.key}"
+        self.entity_description = description
+
+    def _handle_coordinator_update(self) -> None:
+        value = self.coordinator.get_cached(self.entity_description.char)
+        if isinstance(value, datetime):
+            value = value.replace(
+                tzinfo=dt_util.get_time_zone(self.hass.config.time_zone)
+            )
+        self._attr_native_value = value
+        super()._handle_coordinator_update()
+
+
+class GardenaBluetoothRemainSensor(GardenaBluetoothEntity, SensorEntity):
+    """Representation of a sensor."""
+
+    _attr_device_class = SensorDeviceClass.TIMESTAMP
+    _attr_native_value: datetime | None = None
+    _attr_translation_key = "remaining_open_timestamp"
+
+    def __init__(
+        self,
+        coordinator: Coordinator,
+    ) -> None:
+        """Initialize the sensor."""
+        super().__init__(coordinator, {Valve.remaining_open_time.uuid})
+        self._attr_unique_id = f"{coordinator.address}-remaining_open_timestamp"
+
+    def _handle_coordinator_update(self) -> None:
+        value = self.coordinator.get_cached(Valve.remaining_open_time)
+        if not value:
+            self._attr_native_value = None
+            super()._handle_coordinator_update()
+            return
+
+        time = datetime.now(timezone.utc) + timedelta(seconds=value)
+        if not self._attr_native_value:
+            self._attr_native_value = time
+            super()._handle_coordinator_update()
+            return
+
+        error = time - self._attr_native_value
+        if abs(error.total_seconds()) > 10:
+            self._attr_native_value = time
+            super()._handle_coordinator_update()
+            return
diff --git a/homeassistant/components/gardena_bluetooth/strings.json b/homeassistant/components/gardena_bluetooth/strings.json
index 0a9677b1f92..3548412e04f 100644
--- a/homeassistant/components/gardena_bluetooth/strings.json
+++ b/homeassistant/components/gardena_bluetooth/strings.json
@@ -36,6 +36,14 @@
         "name": "Season pause"
       }
     },
+    "sensor": {
+      "activation_reason": {
+        "name": "Activation reason"
+      },
+      "remaining_open_timestamp": {
+        "name": "Valve closing"
+      }
+    },
     "switch": {
       "state": {
         "name": "[%key:common::state::open%]"