Nagano
September
Weather in Nagano for September 2025
Your guide to Nagano weather in September - trends and predictions
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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9
Dry days
21
Rainy days
0
Snow days
27°/14°
Temperatures
8 km/h
Avg max wind
83 %
Avg humidity
Nagano in September average weather
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| 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
See the weather trend as well as the moving average line
September weather day by day
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| 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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Important Notice
Our weather forecast for Nagano in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Nagano forecast closer to your planned date for the most up-to-date weather information.
Nagano in September - FAQ
What are the expected maximum and minimum temperatures in Nagano during September?
Enjoy moderate daytime temperatures of up to 27° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Nagano during September?
Significant rainfall exceeding 155.3 mm is expected in Nagano during September, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Nagano during September?
The average wind speed in Nagano during September is 8 km/h, suggesting breezy to windy conditions, depending on your activities.
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
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