We provide the following information published by the Japan Meteorological Agency (JMA) as an easy-to-use API. Because these forecasts are generated specifically within Japan, you can obtain highly accurate weather data.

(1) Today’s and Tomorrow’s Weather Forecast
Weather forecasts for today and tomorrow, updated daily at 5:00, 11:00, and 17:00.
Note: Additional updates may be issued outside of these scheduled times during severe weather conditions.
Data can be retrieved for 142 locations nationwide. Available parameters include:
Forecast issue date and time, weather conditions, wind, probability of precipitation, maximum and minimum temperatures, and more.

(2) Weekly Weather Forecast
Weather forecasts for up to one week in advance, updated daily at 11:00 and 17:00.
Data can be retrieved at the prefecture level. Available parameters include:
Forecast issue date and time, weather conditions, probability of precipitation, maximum and minimum temperatures, forecast confidence, and more.