Weather in Nagano for September 2025
In general, the average temperature in Nagano at the beginning of September is 29.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24.6 °C by the end of September.
Nagano experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
Is September a good time to visit Nagano? check out the best time to travel to Nagano page.
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Nagano in September average weather
Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
---|---|---|---|---|---|---|
1 32° | 2 30° | 3 30° | 4 29° | 5 30° | 6 26° | 7 28° |
8 25° | 9 29° | 10 31° | 11 28° | 12 30° | 13 30° | 14 31° |
15 28° | 16 29° | 17 31° | 18 29° | 19 26° | 20 28° | 21 25° |
22 20° | 23 21° | 24 23° | 25 24° | 26 26° | 27 25° | 28 25° |
29 24° | 30 25° |
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Temperatures trend during September in Nagano
September weather day by day
Date | Weather | Temperatures | Rain | UV | More |
---|---|---|---|---|---|
1 Sept. | Patchy rain possible | 32° /14° | 0.6 mm | 7 | |
2 Sept. | Patchy rain possible | 30° /18° | 2.2 mm | 7 | |
3 Sept. | Patchy rain possible | 30° /14° | 10.9 mm | 7 | |
4 Sept. | Light drizzle | 29° /14° | 1 mm | 6 | |
5 Sept. | Moderate or heavy rain shower | 30° /15° | 14 mm | 7 | |
6 Sept. | Moderate or heavy rain shower | 26° /14° | 12 mm | 6 | |
7 Sept. | Partly cloudy | 28° /13° | 1.1 mm | 7 | |
8 Sept. | Light rain shower | 25° /15° | 17.4 mm | 6 | |
9 Sept. | Light rain shower | 29° /16° | 4.3 mm | 7 | |
10 Sept. | Moderate or heavy rain shower | 31° /16° | 6.9 mm | 7 | |
11 Sept. | Light rain shower | 28° /16° | 3.2 mm | 7 | |
12 Sept. | Cloudy | 30° /17° | 1.8 mm | 7 | |
13 Sept. | Mist | 30° /17° | 4.6 mm | 7 | |
14 Sept. | Mist | 31° /16° | 1.1 mm | 7 | |
15 Sept. | Mist | 28° /19° | 3.6 mm | 6 | |
16 Sept. | Light rain shower | 29° /17° | 6.2 mm | 6 | |
17 Sept. | Light rain shower | 31° /17° | 8.2 mm | 7 | |
18 Sept. | Patchy rain possible | 29° /16° | 5.6 mm | 7 | |
19 Sept. | Patchy rain possible | 26° /15° | 9.1 mm | 6 | |
20 Sept. | Light rain shower | 28° /15° | 2.5 mm | 6 | |
21 Sept. | Patchy light drizzle | 25° /17° | 3.7 mm | 6 | |
22 Sept. | Light rain shower | 20° /13° | 20.2 mm | 5 | |
23 Sept. | Patchy rain possible | 21° /7° | 0.8 mm | 5 | |
24 Sept. | Partly cloudy | 23° /6° | 0.1 mm | 6 | |
25 Sept. | Overcast | 24° /6° | 0 mm | 6 | |
26 Sept. | Patchy rain possible | 26° /10° | 1 mm | 6 | |
27 Sept. | Patchy light rain | 25° /13° | 2.8 mm | 6 | |
28 Sept. | Light rain shower | 25° /13° | 3.5 mm | 6 | |
29 Sept. | Patchy rain possible | 24° /11° | 0.6 mm | 5 | |
30 Sept. | Light rain shower | 25° /12° | 1 mm | 6 | |
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Nagano in September - FAQ
What to pack to Nagano in September?
As you prepare for your trip to Nagano 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 Nagano, 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
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold 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 Nagano
UV exposure in Nagano during September
Quick links
Get accurate weather forecasts for Nagano, located at latitude 36.65 and longitude 138.183. Stay updated with localized weather information tailored for Nagano.