Weather forecasts, official weather warnings, fire-risk forecasts and ocean observations from SMHI for Homey. Weather forecasts use SNOW1gv1, warnings use SMHI's official impact-based warning feed, fire risk uses the daily FWIF1G point forecast, and sea-level/wave devices use SMHI Oceanographic Observations.
- Create multiple weather devices with independent settings.
- Use Homey's geolocation or a custom latitude/longitude.
- Select forecast offsets from now up to 36 hours.
- Weather, temperature and feels-like temperature.
- Wind direction, wind speed and gust speed.
- Relative humidity, air pressure and visibility.
- Thunderstorm probability.
- Total, low, medium and high cloud cover.
- Precipitation type and precipitation statistics.
- Flow triggers for weather changes and selected sensor changes.
- Flow conditions for weather, temperature, wind, cloud cover and precipitation.
- Forecast-oriented conditions such as rain, maximum wind speed and minimum temperature within the next hours.
- A separate SMHI Weather Warnings device for official Yellow, Orange and Red warnings at the configured location.
- Warning Flow triggers for issued, updated and ended warnings, plus conditions for current warning state and severity.
- A separate SMHI Fire Risk device with daily forest fire risk, grass fire risk and forest fuel dryness forecasts from today through five days ahead.
- Fire-risk Flow triggers for class changes and conditions for minimum risk/dryness levels.
- Separate SMHI Sea Level and SMHI Waves devices bound to named SMHI ocean observation stations.
- Sea-level RH2000, observation age/quality, significant and maximum wave height, wave period and wave direction where available.
- Ocean Flow cards for sea-level threshold crossings and wave-height thresholds.
The app is intended for locations within SMHI's SNOW forecast area and is primarily presented for Sweden, Norway, Denmark and Finland.
v0.9.0 adds a separate SMHI Weather Warnings device. It matches the configured/Homey coordinates against SMHI's actual GeoJSON warning areas and exposes the highest-priority matching warning, validity period, warning area, warning count and SMHI as the source.
The driver intentionally handles official Yellow, Orange and Red weather warnings. SMHI MESSAGE entries are excluded from this device. Official warning text is shown from SMHI without machine translation or rewriting.
v0.10.0 adds a separate SMHI Fire Risk device using SMHI's daily FWIF1G point forecast. It keeps three SMHI concepts separate: forest fire risk, grass fire risk and forest fuel dryness.
The device supports today through five days ahead, Homey's geolocation or custom coordinates, and displays the source approval time. Forest fire risk and forest fuel dryness preserve SMHI's 1–5E presentation; API class 6 is displayed as 5E. Missing/off-season model values are not treated as low risk.
If a reliable forecast cannot be obtained for the selected location/day, the device becomes unavailable rather than presenting stale data as current.
Fire risk is a forecast, not an official fire ban. Users must follow fire bans and restrictions issued by the responsible authorities.
v0.11.0 adds two station-based ocean observation devices:
- SMHI Sea Level — measured sea level in RH2000 from a selected SMHI/Sjöfartsverket station, including observation time, age, quality and source.
- SMHI Waves — measured significant wave height from a selected wave buoy/station, with maximum wave height, mean period and wave direction when those measurements are available at the same station.
Pairing lists actual stations rather than silently choosing a nearby station. The station ID is the Homey device identity, and the station name/owner are shown on the device.
Sea Level reads the latest RH2000 minute observations and allows normal publication latency before declaring data stale. Waves requires a recent significant-wave-height measurement; optional wave fields may be absent without making the device unavailable.
Wave direction prefers SMHI's mean direction when fresh and falls back to direction at Tp/peak wave energy when that is the current direction series for the buoy. The displayed compass direction follows SMHI's convention: the direction from which the waves come.
Existing Flow card IDs and capability IDs are preserved for backwards compatibility. v0.8.0 also adds:
- Weather changes to ...
- Weather changes from ... to ...
- Forecast conditions for rain, maximum wind speed and minimum temperature in the coming hours.
- A Severe weather condition trigger based on forecast symbols. This is an app-level condition and not an official SMHI weather warning.
v0.8.0 corrects several interpretation problems introduced during the v0.7.0 migration to SNOW1gv1, including wind heading and precipitation classification.
If you changed a Flow to compensate for incorrect values in v0.7.0, review that Flow after upgrading. For example, a wind direction that was previously shown with the wrong compass heading is now mapped correctly.
Weather data is fetched from SMHI's SNOW1gv1 point forecast API. Each device refreshes automatically and also refreshes immediately when its forecast time or location settings change.
Transient API/network failures are retried. If a fetch fails completely, the app keeps the last successfully received capability values and logs the error.
The app has zero third-party runtime dependencies. Network access uses Node's built-in HTTPS module and the feels-like calculation is implemented locally with regression tests.
package-lock.json is intentionally kept even with zero dependencies so CI can verify the dependency graph deterministically. .npmrc uses save-exact=true so any future dependency must be added explicitly and pinned.
Before switching branches or starting a new test cycle, verify that the local working tree is clean:
npm run clean-checkThen prepare npm metadata and run the regression tests:
npm ci
npm testRun the app on a connected Homey:
homey app run- Community discussion: Swedish Weather Forecast
- Bugs and feature requests: GitHub Issues
- Added separate SMHI Sea Level and SMHI Waves devices.
- Pairing uses named active ocean observation stations and wave buoys.
- Sea Level exposes measured RH2000 level, station, observation time/age, quality and source.
- Waves exposes significant and maximum wave height, mean wave period and wave direction where supported.
- Wave direction falls back from mean direction to direction at Tp/peak energy when needed.
- Added Flow triggers for sea-level threshold crossings and wave-height threshold crossings.
- Added corresponding conditions for current sea level and wave height.
- Added freshness handling so stale primary measurements make the relevant device unavailable.
- Added dedicated ocean, sea-level and wave icons plus regression coverage for station selection, observation age and direction fallback.
- Added a separate SMHI Fire Risk device.
- Daily forecasts for today through five days ahead.
- Shows forest fire risk, grass fire risk and forest fuel dryness as separate SMHI model outputs.
- Preserves SMHI's 1–5E presentation for forest fire risk and fuel dryness.
- Added Flow triggers when a fire-risk/dryness class changes to a selected level.
- Added Flow conditions for minimum forest-fire risk, grass-fire risk and forest dryness.
- Added point-response caching, source freshness validation and safe unavailable handling when reliable data is missing.
- Added dedicated fire-risk icons and regression tests.
- Fire-risk forecasts are explicitly kept separate from official fire bans.
- Added a separate SMHI Weather Warnings device.
- Matches locations against SMHI GeoJSON warning polygons, including marine warning areas.
- Supports official Yellow, Orange and Red warning levels.
- Shows warning status, level, event, area, validity period, count and source.
- Added Flow triggers for warning issued, updated and ended.
- Added Flow conditions for warning present, active now and minimum warning level.
- Added shared warning-feed caching and regression tests for geometry and state transitions.
- Added dedicated warning icons.
- Added
npm run clean-checkto prevent branch/test work from starting with a dirty working tree.
- Removed all third-party runtime dependencies.
- Replaced
node-fetchwith Node's built-in HTTPS module. - Replaced
feelswith a local implementation that preserves the previous formulas and outputs. - Added regression coverage for feels-like calculations and a CI guard enforcing zero runtime dependencies.
- Updated to npm lockfile version 3 and added exact-version policy for any future dependencies.
- Stabilized the SNOW1gv1 migration.
- Corrected wind direction headings and precipitation type handling.
- Corrected cloud-cover handling.
- Fixed forecast settings being applied one change late.
- Completed previously declared forecast Flow conditions and severe-weather trigger.
- Added weather changed-to and changed-from/to triggers.
- Improved retry, timeout, timer and timezone handling.
- Added regression tests and GitHub Actions CI.
- Removed committed dependencies from the repository.
- Compatibility note: Flows created to compensate for incorrect v0.7.0 wind headings or precipitation classification may need review.
- Migrated the weather backend from the retired PMP3gv2 API to SMHI SNOW1gv1.
See the Git history and Homey changelog for older release notes.