WeatherFlow

The WeatherFlow integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] is a local-only integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] that reads weather data from all WeatherFlow Tempest-compatible weather stations on the local network.

Which integration should I use?

There are two integrations for WeatherFlow devices, and you are not limited to selecting just one.

• WeatherFlow is a local-only, UDP-based integration that reads data directly from the device. This integration requires the Home Assistant server and the WeatherFlow device to be on the same subnet.

• WeatherFlow Cloud is a cloud-based integration that closely mirrors the data available in the Tempest app and is likely a good starting place for most users as it provides both forecast and sensor data.

Configuration

To add the WeatherFlow hub to your Home Assistant instance, use this My button:

Sensors

This integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] will expose the following sensors:

Atmospheric sensors

• Air density

  • Description: The mass per unit volume of Earth’s atmosphere.

• Air pressure

  • Description: The atmospheric pressure at the station level.

• Dew point

  • Description: The temperature to which air must be cooled to become saturated with water vapor.

• Feels like

  • Description: An index that combines temperature and humidity to determine the apparent temperature.

• Humidity

  • Description: Percentage of moisture in the air relative to the maximum it can hold at the current temperature.

• Temperature

  • Description: The degree or intensity of heat present in the area.

• Vapor pressure

  • Description: Pressure exerted by water vapor in the air (absolute moisture content).

• Wet bulb temperature

  • Description: The lowest temperature that can be reached under current ambient conditions by the evaporation of water only.

Wind sensors

• Wind direction

  • Description: Wind direction relative to the station direction.

• Wind direction average

  • Description: Average wind direction over the past minute.

• Wind gust

  • Description: Highest 3-second wind speed in the past minute.

• Wind lull

  • Description: Lowest 3-second wind speed in the past minute.

• Wind speed

  • Description: Wind speed at the station.

Precipitation sensors

• Precipitation

  • Description: Precipitation (accumulated over the previous minute).

• Precipitation intensity

  • Description: Precipitation intensity (extrapolated from the accumulation over the previous minute).

• Precipitation type

  • Description: Precipitation type (none, rain, hail, rain_hail).

Lightning sensors

The station detects lightning with an AS3935 lightning sensor. The distances it reports are estimates of how far away the storm is, not measurements of each strike. For details, refer to Known limitations.

• Lightning average distance

  • Description: Average of the estimated distances reported with the lightning strikes detected in the past minute.

• Lightning count

  • Description: Number of lightning strikes detected in the past minute.

• Lightning last distance

  • Description: Estimated distance to the storm, as reported with the most recent detected lightning strike.

• Lightning last energy

  • Description: Value the sensor reports for the most recent detected lightning strike. It has no unit and, according to the sensor’s manufacturer, no physical meaning.

• Lightning last strike

  • Description: Timestamp of the most recent detected lightning strike; unlike the Lightning strike event entity below, this sensor stores the last recorded strike time.

Solar and light sensors

• Illuminance

  • Description: Amount of visible light received, measured in lux.

• Irradiance

  • Description: Total solar radiation received, measured in W/m².

• UV index

  • Description: Intensity of ultraviolet radiation received.

Diagnostic sensors

Additionally, the following diagnostic sensors are available:

• Battery (percentage)

  • Description: Station battery (percentage).

• Battery voltage

  • Description: Battery voltage of the station.

• Signal strength

  • Description: Signal strength between the station and the hub.

• Uptime

  • Description: Uptime of the station.

Event entities

The WeatherFlow Tempest station also sends event triggers when it starts raining and when there is a lightning strike nearby. This integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] will expose these eventEvery time something happens in Home Assistant, an event is fired. Different types of events are fired when, for example, an entity’s state changes, an action such as light.turn_on is performed, or Home Assistant starts. All entities produce state change events. Every time the state or the attributes of an entity change, a state change event is produced. Events can be used to trigger automations. For example, you can trigger an automation to turn on a speaker in a room when a light in that room turns on. [Learn more] entitiesAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more] and can be used for automations. The following entities will be exposed:

• Lightning strike

  • Description: Fires when the station detects a lightning strike.

• Precipitation start

  • Description: Fires when precipitation starts at the station.

Known limitations

Lightning detection

The sensor doesn’t detect every lightning strike, and electrical interference near the station can cause false detections. The station broadcasts every strike it detects, and this integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] uses those broadcasts directly. WeatherFlow checks the strikes against other sources, so the WeatherFlow app and the WeatherFlow Cloud integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] can show a different number of strikes and different distances.

Lightning distance

The sensor estimates the distance to the nearest edge of the storm from the strikes it detected recently. The estimate changes gradually as a storm approaches or moves away, so it can differ from the distance to the most recent strike. The sensor reports the distance in steps of 1 (overhead), 5, 6, 8, 10, 12, 14, 17, 20, 24, 27, 31, 34, 37, and 40 km.

A distance of 63 km means that the strike was out of range and the sensor couldn’t estimate its distance. The Lightning average distance includes these values, so it’s too high for a minute with an out-of-range strike.

Networking notes

This integrationIntegrations connect and integrate Home Assistant with your devices, services, and more. [Learn more] relies on the ability of Home Assistant to receive UDP traffic on port 50222. You may run into trouble if you have a more complex network setup using either VLANs or multiple subnets.

The hub broadcasts each update once and doesn’t resend it. If Home Assistant is connected over Wi-Fi, it can occasionally miss an update. A wired connection is more reliable.