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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Australia Data Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
If you’re travelling to Japan in September, plan for lingering summer heat and humidity, especially in the first half, but also prepare for the peak of typhoon season. The live forecast above shows current conditions; below we break down what you’ll encounter across the country.
What’s the weather like in Japan during September?
September is a transitional month – the sticky, humid summer hasn’t fully released its grip, especially in Tokyo and Kyoto, but cooler autumn air begins to edge in by late in the month. Tokyo’s average high sits around 27°C, with humidity levels still noticeable, particularly in the first couple of weeks. The Japan Meteorological Agency notes that September is also the peak of the typhoon season, so you can expect several days of heavy rain and strong winds, especially across southern and western regions like Okinawa and Kyushu.
If you’re wondering about tokyo weather september humidity, it typically sits above 70%, so light, breathable fabrics are a must. By contrast, october weather japan brings lower humidity and more crisp, sunny days. For more on how conditions change, see our Australia weather hub for comparison with home conditions, or check severe weather warnings for typhoon advisories.
Should you visit Japan in September or October?
If you prefer warm days and don’t mind occasional downpours, September offers lower crowds and lower prices – just pack a sturdy umbrella. October, on the other hand, brings cooler, drier weather and stunning autumn foliage, making it more popular for sightseeing. For those considering japan in september or october, October is generally the safer bet for outdoor activities, but September can reward you with a more relaxed travel experience.
Is September a good time to visit Japan?
Yes, if you’re comfortable with high humidity and the risk of typhoons. It’s less crowded than October and often cheaper, but you’ll need to be flexible with plans if a storm approaches.
What should I pack for Japan in September?
Light, moisture-wicking clothing for humidity, a lightweight rain jacket, an umbrella, comfortable walking shoes, and a light sweater for cooler evenings. Don’t forget sunscreen – the sun can still be strong.
How humid is Tokyo in September?
Tokyo’s relative humidity in September averages around 70–75%, making it feel stickier than the actual temperature suggests. Morning and evening humidity can be especially high, so stay hydrated and choose breathable fabrics.