Rain Radar
· v2.6
About
Rain Radar — will it rain, in how long, and for how long
Five screens, no menus. Press down to go through them.
1. SUMMARY — temperature and one sentence: raining now, rain in 18 minutes, or
nothing for the next 90.
2. NEXT 90 MINUTES — five-minute steps, so you can see the gap between showers
rather than guess at it.
3. HOURLY — the next two days: temperature, chance of rain, wind, humidity,
cloud, UV. Open any hour for the detail.
4. RADAR — the actual precipitation map, with the coastline drawn so you can
tell where the cloud is. It plays itself forward once on opening, and you
can scrub two hours ahead or an hour back.
5. AIR — air quality, UV index, dew point and humidity.
WHAT IT ACTUALLY KNOWS
The nowcast and the radar map are measured, not modelled: minute-by-minute
precipitation from weather radar, and real forecast frames every ten minutes.
Where there is no radar, the app says so instead of inventing a dry afternoon.
"No radar here" and "radar unavailable" are different sentences on purpose —
one is about the place, the other about the minute.
Radar coverage comes from Rainbow's fused radar-and-satellite pipeline — one-
kilometre resolution, refreshed every ten minutes — and it is wide, though not
everywhere. Across Europe it follows the continental radar composite: London,
Dublin, Paris, Madrid, Lisbon, Rome, Berlin, Warsaw, Vienna, Stockholm, Oslo,
Helsinki, and the western Balkans down to Zagreb, Belgrade, Bucharest and
Sofia, with Saint Petersburg and Kaliningrad at the Russian edge. The Americas
are covered end to end in the north — New York, Los Angeles, Toronto, Mexico
City — and in Brazil, from Sao Paulo. In Asia it reaches Japan, South Korea,
Taiwan and Hong Kong, and across South-East Asia: Bangkok, Singapore, Kuala
Lumpur, Jakarta, Manila, Hanoi and Ho Chi Minh City. Australia and New Zealand
are covered throughout — Sydney, Melbourne, Perth, Auckland.
Where the radar does not reach, the app says so rather than inventing weather,
and the gaps are worth knowing before you lean on it: mainland China, India,
the Middle East, Central Asia (Almaty and Tashkent included), most of Africa,
the Andes and southern South America, and the interior of Russia along with
Turkey, Greece, Ukraine and the Caucasus.
The hourly forecast and the air screen work everywhere, radar or no radar: they
come from your watch's own weather and from a separate global source.
BATTERY
Nothing runs in the background. No timers, no background service, no GPS wake —
the app only does anything while it is on the screen, and the last known
position is read from what the watch already has.
CREDITS
Precipitation radar by Rainbow. Air quality by Open-Meteo. Base map
(c) OpenStreetMap contributors, (c) CARTO. Hourly forecast, dew point,
humidity and UV index come from your watch's own weather.
FREE
The whole app, every screen, nothing held back and nothing to pay. It may not
stay free forever, but it is now.
It touches the network only for the forecast and the radar map — never in the
background — and no reading of yours leaves the watch.
What's new
1.6
• New daily screen: a full week's forecast right after the hourly one —
weekday, weather icon, chance of rain, and the day's high and low.
• The hourly forecast now scrolls across both days, with a scrollbar.
• Cleaner layout on the summary, hourly and daily screens.
• The radar no longer sticks on "loading" when a frame is dropped —
it falls back to now.
• A new app icon — a cloud.
1.7 - 2.0
• Finnish (Suomi) language. Contributed by Juha Viheriäkoski
2.0
New "Sweep" radar (optional, enable in settings): the rain as a
field three hours ahead — the front's direction and speed, when
it reaches you, and nearby towns — smoothly animated with a
scanning beam. Works even where the map radar has no coverage.
2.1 - 2.5 - fix bugs
2.6 - fix fonts