Everything a weather app should do.
Nothing it shouldn't.
Fourteen releases of craft by one hobbyist developer and the open-source community — every feature works without an account or a key. (Psst — move your cursor over the radar tile.)
Animated rain radar
Playback, scrubbing, pinch-zoom and recenter — rendered by a pure-JS tile engine, so there's no Google Maps and nothing to bill you.
Forecasts with honesty built in
A P10–P90 ensemble band shows how sure the models are — plus per-model accuracy scoring and a leaderboard.
Official warnings, two continents
Government alerts from MeteoAlarm across Europe and the US National Weather Service — with opt-in rules for fog, black ice, storms and more.
Material You, plus ten themes
On Android 12+ the whole palette — cards, charts, widgets — follows your wallpaper. Watch this page's own palette shift when you switch the weather above.
Private by architecture
No accounts. No analytics. No crash reporters. Your data lives on your device — by design, not by policy.
16 languages, completely
Every catalog is a full 935-key pass — voices, launcher shortcuts and all. See them.
There is no "our cloud" in this diagram.
Most weather apps route your location through their servers. MU Weather talks straight to public APIs and caches everything on-device — you can verify every hop in the source.
Spoken in 16 tongues
Each catalog is a complete translation — every placeholder, every voice, every launcher shortcut.
Grab v1.4.0
Built reproducibly on Expo EAS, published with SHA-256 checksums. When in doubt, pick arm64.
Fair questions
Is it really free? What's the catch?
There is no catch. MU Weather is MIT-licensed open source with no ads, no accounts and no paid tier. It runs on free public APIs, so there's nothing to sell you and nothing to rate-limit behind a vendor's paywall.
Does it need an internet connection?
It's offline-friendly: forecasts, air quality and more are cached on-device with sensible TTLs, so the app stays useful on the subway or in the mountains — the radar and warnings, being inherently live, need a connection.
What about the "optional AI digest"?
If you paste your own Anthropic or OpenAI key in settings, the daily spoken digest is upgraded to a natural-language summary. Without a key — the default — nothing changes: the built-in template digest still reads your day aloud. Only the digest text is ever sent, never your location history.
Is there an iOS version?
Not yet. MU Weather is Android-first: Material You theming, widgets and launcher shortcuts are the heart of the experience. The codebase is React Native, so iOS isn't off the table eventually.
How accurate is the forecast?
The app measures itself: every forecast is scored against actual observations, you get a per-metric accuracy view and a model leaderboard (ECMWF, GFS, ICON, Météo-France, JMA…), and rain probabilities are locally calibrated from your own reports.
Can I trust the APKs?
Every release ships from reproducible Expo EAS builds with SHA-256 checksums published on the release page. The source of every release tag is public, so builds can be audited end-to-end.
Data sources
Keyless public services that make MU Weather possible.
| Open-Meteo | Forecast, ensemble, archive, air quality and marine data. Free for non-commercial use. |
| RainViewer | Global precipitation radar tiles for the animated map. |
| NOAA SWPC | Space weather: Kp index, solar wind and aurora conditions. |
| MeteoAlarm | Official severe-weather warnings across Europe (EUMETNET). |
| US National Weather Service | Official warnings and advisories for US locations (api.weather.gov). |