September is a transition month in Tokyo, sitting between the intense heat of summer and the calmer, cooler days of autumn. Early in the month, the city can still feel hot and humid, with lingering summer weather and a higher chance of typhoons or heavy rain.
As the weeks pass, temperatures gradually become more comfortable, the busiest summer festival season winds down, and Tokyo begins to shift into its autumn rhythm. This complete guide explains what Tokyo is like in September, including the weather, typhoon risk, what to wear, seasonal events, crowds, and practical travel tips.
September Weather in Tokyo
Early September: Still hot and humid, averaging 28 to 31°C (82 to 88°F). Feels similar to August, especially in the first two weeks.
Mid-September: A noticeable shift. Daily highs drop to 25 to 28°C (77 to 82°F). Humidity begins to ease. The evenings become genuinely comfortable for the first time since May.
Late September: Highs of 22 to 26°C (72 to 79°F). Lows of 18 to 20°C (64 to 68°F). Excellent conditions for outdoor sightseeing, a light jacket is needed in the evenings.
Rain: Tokyo averages 12 to 15 rainy days in September. Rain comes both from lingering summer thunderstorms and from typhoon-related systems. Carry a compact umbrella throughout the month.
Typhoon Season in September
September is statistically the peak typhoon month for the Tokyo region. Most typhoons in the Pacific track north through the Philippine Sea and approach Japan from the southwest. Tokyo-direct typhoon hits are relatively infrequent (roughly every 3 to 5 years for a significant impact). Still, indirect effects, including heavy rain, strong winds, and occasional transport disruption, can affect any September.
What to do if a typhoon approaches: The Japan Meteorological Agency (jma.go.jp) provides English-language typhoon tracking. Tokyo’s public transport typically suspends service when strong typhoons approach. Major attractions close. Hotel rooms are safest during passage. Most typhoons that affect Tokyo do so for 12 to 24 hours before conditions improve.
Probability: The statistical chance of a significant typhoon disrupting any given September week in Tokyo is roughly 10 to 15 percent. Most September visits are not affected. It is worth knowing the procedure without being alarmed by the risk.
What to Wear in Tokyo in September
Early September: summer clothing from August still applies. Light breathable fabrics, shorts, and sun protection.
Mid-September onward: start adding a light long-sleeve layer for evening, and a light jacket for the final week. The transition is gradual. Layering works well as temperatures can vary significantly between morning and afternoon.
Why Late September Is One of Tokyo’s Best Periods
The final 10 days of September represent some of the best visiting conditions in the Tokyo calendar. The summer crowds have thinned (most international summer visitors have left), the temperature is comfortable, the light is warm without the summer haze, and accommodation prices often dip from August peaks. The autumn foliage is still 4 to 6 weeks away, so this is the low-demand period before the autumn rush begins.
Silver Week (a cluster of public holidays in the third week of September) can cause domestic crowding. Check the Japanese holiday calendar when planning.
See the best time to visit Tokyo guide for the full year breakdown.
