Weather in Japan for September 2025
In general, the average temperature in Japan at the beginning of September is 30.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 26.7 °C by the end of September.
Expect significant rainfall in Japan during September, with an average of 16 rainy days.
Is September a good time to visit Japan? check out the best time to travel to Japan page.
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Japan in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  31° | 2 32° | 3  30° | 4  28° | 5  31° | 6 31° | 7 31° |
| 8 28° | 9 31° | 10 31° | 11 30° | 12 31° | 13 32° | 14 31° |
| 15  32° | 16 30° | 17 31° | 18 32° | 19 32° | 20 32° | 21 31° |
| 22 30° | 23 23° | 24  25° | 25 25° | 26 29° | 27 29° | 28 28° |
| 29 25° | 30 26° |
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Temperatures trend during September in Japan
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Sunny | 31° /26° | 1 mm | 8 | |
| 2 Sept. | Sunny | 32° /26° | 1.1 mm | 8 | |
| 3 Sept. | Light rain | 30° /24° | 18.2 mm | 7 | |
| 4 Sept. | Light rain shower | 28° /23° | 35.9 mm | 6 | |
| 5 Sept. | Partly cloudy | 31° /24° | 1.4 mm | 8 | |
| 6 Sept. | Patchy rain possible | 31° /26° | 0.8 mm | 8 | |
| 7 Sept. | Partly cloudy | 31° /26° | 1 mm | 8 | |
| 8 Sept. | Light rain shower | 28° /24° | 70 mm | 6 | |
| 9 Sept. | Light rain shower | 31° /24° | 8.2 mm | 7 | |
| 10 Sept. | Partly cloudy | 31° /25° | 2.6 mm | 8 | |
| 11 Sept. | Light rain shower | 30° /26° | 0.9 mm | 7 | |
| 12 Sept. | Partly cloudy | 31° /26° | 0.3 mm | 8 | |
| 13 Sept. | Sunny | 32° /26° | 0.1 mm | 8 | |
| 14 Sept. | Sunny | 31° /26° | 0.1 mm | 8 | |
| 15 Sept. | Overcast | 32° /26° | 0.1 mm | 7 | |
| 16 Sept. | Patchy rain possible | 30° /25° | 7.4 mm | 7 | |
| 17 Sept. | Light rain shower | 31° /26° | 0.4 mm | 8 | |
| 18 Sept. | Sunny | 32° /27° | 0.5 mm | 8 | |
| 19 Sept. | Sunny | 32° /27° | 1.7 mm | 8 | |
| 20 Sept. | Patchy light drizzle | 32° /27° | 1.1 mm | 8 | |
| 21 Sept. | Patchy rain possible | 31° /25° | 0.2 mm | 7 | |
| 22 Sept. | Light rain shower | 30° /23° | 9.4 mm | 6 | |
| 23 Sept. | Light rain shower | 23° /20° | 8.2 mm | 5 | |
| 24 Sept. | Cloudy | 25° /20° | 0 mm | 6 | |
| 25 Sept. | Partly cloudy | 25° /20° | 0.1 mm | 7 | |
| 26 Sept. | Sunny | 29° /21° | 0.1 mm | 7 | |
| 27 Sept. | Patchy rain possible | 29° /23° | 3.6 mm | 6 | |
| 28 Sept. | Patchy rain possible | 28° /22° | 3.9 mm | 7 | |
| 29 Sept. | Patchy light drizzle | 25° /22° | 3.3 mm | 6 | |
| 30 Sept. | Patchy rain possible | 26° /22° | 0.4 mm | 6 | |
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Guide for Japan in September
In September, Japan experiences a transition from summer to autumn, resulting in varied weather conditions across the country. At the beginning of the month, the northern regions such as Hokkaido may still have remnants of summer with temperatures around 20° and occasional rainfall.
In contrast, central areas like Tokyo and Kyoto can expect milder temperatures around 25° with decreasing humidity, making it a pleasant time for outdoor activities and sightseeing.
Moving towards the end of September, the weather in Japan begins to cool down further. In Hokkaido, temperatures may drop to around 15° as autumn sets in, creating picturesque landscapes with the changing colors of the leaves.
In central regions, the temperatures continue to decrease to around 22°, and the skies become clearer, providing comfortable conditions for exploring the cultural and historical attractions.
Overall, September in Japan offers a transition from the warmth of summer to the crispness of autumn, making it an ideal time to experience the country's natural beauty and cultural richness.
Japan in September - FAQ
What to pack to Japan in September?
As you prepare for your trip to Japan in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Japan, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Sandals/Flip-flops: Comfortable for warm climates
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
September rainfall patterns in Japan
UV exposure in Japan during September
Quick links
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