diff --git a/homeassistant/components/unifi/sensor.py b/homeassistant/components/unifi/sensor.py
index 7a161a9d7c2..4f3e8528256 100644
--- a/homeassistant/components/unifi/sensor.py
+++ b/homeassistant/components/unifi/sensor.py
@@ -300,13 +300,22 @@ def make_wan_latency_sensors() -> tuple[UnifiSensorEntityDescription, ...]:
 @callback
 def async_device_temperatures_value_fn(
     temperature_name: str, hub: UnifiHub, device: Device
-) -> float:
+) -> float | None:
     """Retrieve the temperature of the device."""
-    return_value: float = 0
     if device.temperatures:
-        temperature = _device_temperature(temperature_name, device.temperatures)
-        return_value = temperature if temperature is not None else 0
-    return return_value
+        return _device_temperature(temperature_name, device.temperatures)
+    return None
+
+
+@callback
+def async_device_temperatures_available_fn(
+    temperature_name: str, hub: UnifiHub, obj_id: str
+) -> bool:
+    """Determine if a device temperature has a value."""
+    device = hub.api.devices[obj_id]
+    if not async_device_available_fn(hub, obj_id):
+        return False
+    return _device_temperature(temperature_name, device.temperatures or []) is not None
 
 
 @callback
@@ -315,7 +324,11 @@ def async_device_temperatures_supported_fn(
 ) -> bool:
     """Determine if an device have a temperatures."""
     if (device := hub.api.devices[obj_id]) and device.temperatures:
-        return _device_temperature(temperature_name, device.temperatures) is not None
+        return any(
+            temperature_name in temperature["name"]
+            for temperature in device.temperatures
+        )
+
     return False
 
 
@@ -326,7 +339,8 @@ def _device_temperature(
     """Return the temperature of the device."""
     for temperature in temperatures:
         if temperature_name in temperature["name"]:
-            return temperature["value"]
+            if (value := temperature.get("value")) is not None:
+                return value
     return None
 
 
@@ -344,7 +358,7 @@ def make_device_temperatur_sensors() -> tuple[UnifiSensorEntityDescription, ...]
             native_unit_of_measurement=UnitOfTemperature.CELSIUS,
             entity_registry_enabled_default=False,
             api_handler_fn=lambda api: api.devices,
-            available_fn=async_device_available_fn,
+            available_fn=partial(async_device_temperatures_available_fn, name),
             device_info_fn=async_device_device_info_fn,
             name_fn=lambda device: f"{device.name} {name} Temperature",
             object_fn=lambda api, obj_id: api.devices[obj_id],
diff --git a/tests/components/unifi/test_sensor.py b/tests/components/unifi/test_sensor.py
index 4aef840982f..0788f32dd63 100644
--- a/tests/components/unifi/test_sensor.py
+++ b/tests/components/unifi/test_sensor.py
@@ -1774,6 +1774,75 @@ async def test_device_temperatures(
     assert hass.states.get(entity_id).state == updated_state
 
 
+@pytest.mark.parametrize(
+    "device_payload",
+    [
+        [
+            {
+                "board_rev": 3,
+                "device_id": "mock-id",
+                "has_fan": True,
+                "fan_level": 0,
+                "ip": "10.0.1.1",
+                "last_seen": 1562600145,
+                "mac": "00:00:00:00:01:01",
+                "model": "US16P150",
+                "name": "Device",
+                "next_interval": 20,
+                "overheating": True,
+                "state": 1,
+                "type": "usw",
+                "upgradable": True,
+                "uptime": 60,
+                "version": "4.0.42.10433",
+                "temperatures": [
+                    {"name": "CPU", "type": "cpu", "value": 66.0},
+                ],
+            }
+        ]
+    ],
+)
+@pytest.mark.usefixtures("config_entry_setup")
+async def test_device_temperature_with_missing_value(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    mock_websocket_message,
+    device_payload: list[dict[str, Any]],
+) -> None:
+    """Verify that device temperatures sensors are working as expected."""
+    entity_id = "sensor.device_device_cpu_temperature"
+
+    temperature_entity = entity_registry.async_get(entity_id)
+    assert temperature_entity.disabled_by == RegistryEntryDisabler.INTEGRATION
+
+    # Enable entity
+    entity_registry.async_update_entity(entity_id=entity_id, disabled_by=None)
+
+    await hass.async_block_till_done()
+
+    async_fire_time_changed(
+        hass,
+        dt_util.utcnow() + timedelta(seconds=RELOAD_AFTER_UPDATE_DELAY + 1),
+    )
+    await hass.async_block_till_done()
+
+    # Verify sensor state
+    assert hass.states.get(entity_id).state == "66.0"
+
+    # Remove temperature value from payload
+    device = deepcopy(device_payload[0])
+    device["temperatures"][0].pop("value")
+
+    mock_websocket_message(message=MessageKey.DEVICE, data=device)
+
+    assert hass.states.get(entity_id).state == STATE_UNAVAILABLE
+
+    # Send original payload again to verify sensor recovers
+    mock_websocket_message(message=MessageKey.DEVICE, data=device_payload[0])
+
+    assert hass.states.get(entity_id).state == "66.0"
+
+
 @pytest.mark.parametrize(
     "device_payload",
     [