Tokyo Cloudy, Sapporo Sunny: Japan Weather for September 17

Tokyo: cloudy with a 60% rain chance

Tokyo's weather on September 17, 2026 is cloudy, occasionally sunny, with a daily high of 25°C and a low of 19°C. The 06:00 forecast is 19°C, and the 15:00 forecast is 24°C. A stationary front is expected to extend across the area from late morning through evening. The precipitation probability is 60%, with 8 mm of precipitation expected for the day, so an umbrella is a reasonable precaution.

Wind speed is 4 m/s. Air quality is rated Good. The Clothing Index recommends long sleeves, and the Activity Index is rated Good.

Osaka and Fukuoka: warm days in the south

Osaka's weather on September 17, 2026 is sunny then cloudy, with a high of 29°C, a low of 21°C, and relative humidity near 73%. A stationary front is expected to extend across the area from late morning through evening, and the precipitation probability is 60%. The Heatstroke Index (WBGT) is rated Attention.

Fukuoka's weather is sunny then cloudy, with a high of 28°C, a low of 23°C, and a precipitation probability of 40%. Air quality in Fukuoka is rated Good. The Activity Index is rated Good in Fukuoka, while it is rated Slightly poor in Osaka.

Sapporo: sunny and cooler than the south

Sapporo's weather on September 17, 2026 is sunny, with a daily high of 25°C and a low of 15°C. The 06:00 forecast is 15°C, and the 15:00 forecast is 24°C. Relative humidity is near 71%, the precipitation probability is 20% with 0 mm expected for the day, and wind speed is 2 m/s.

Air quality is rated Good, and the Heatstroke Index (WBGT) shows Low risk. The Clothing Index recommends long sleeves, and the Activity Index is rated Excellent for the day.