The radar uses the Japan Meteorological Agency's official rain data, with its standard colours from light rain to over 80 mm per hour.
Drag the slider to go back 3 hours or forward up to 15 hours. The first hour is a detailed short-term forecast, then hourly steps.
Switch to Clouds or Satellite photo to see Himawari satellite images of the last 2 hours.
Everything is in English (and 5 other languages), so you do not need to read the Japanese JMA site.
Everything else in the app
Hour-by-hour forecast with rain timing, feels-like temperature, UV and daily tips.
Rain radar from JMA, 3 hours back and 15 hours ahead, plus live Himawari satellite clouds.
Official warnings: heavy rain, heatstroke alerts, earthquakes, tsunami and typhoons, in plain English.
Trip planner: the weather for every stop of your trip, and ideas for sunny days, rainy days and food.
Road trips: every service area, parking area and 道の駅 on your route, with the weather on arrival.
7 languages: English, 日本語, Deutsch, Français, Italiano, Español, with romaji under Japanese names.
Questions
Is the japan rain radar in english free?
Yes. Japan Weather Today is free, with no sign-up and no ads. It runs in your browser on phone or computer.
Where does the data come from?
Official warnings, radar and typhoon data come from the Japan Meteorological Agency (JMA). Forecasts come from Open-Meteo, which blends national weather models including JMA's.