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 26.7 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 24 °C by the end of September.
Nagano experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 217.7 mm.
Is September a good time to visit Nagano? check out the best time to travel to Nagano page.
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Temperatures
Rain 🌧️
More
4
Dry days
26
Rainy days
0
Snow days
26°/14°
Temperatures
8 km/h
Avg max wind
84 %
Avg humidity
Nagano in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2 25° | 3 26° | 4 27° | 5 28° | 6 27° | 7  26° |
| 8 23° | 9 27° | 10  29° | 11 28° | 12 29° | 13  28° | 14 29° |
| 15 27° | 16 28° | 17 28° | 18 28° | 19 27° | 20 26° | 21  24° |
| 22 23° | 23 22° | 24 22° | 25 25° | 26 24° | 27 24° | 28 23° |
| 29 24° | 30 26° |
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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. | Moderate or heavy rain shower | 28° /15° | 7.3 mm | 6 | |
| 2 Sept. | Moderate rain at times | 25° /17° | 12.7 mm | 6 | |
| 3 Sept. | Moderate or heavy rain shower | 26° /15° | 11.8 mm | 6 | |
| 4 Sept. | Moderate or heavy rain shower | 27° /15° | 11 mm | 6 | |
| 5 Sept. | Moderate or heavy rain shower | 28° /16° | 12.3 mm | 6 | |
| 6 Sept. | Moderate or heavy rain shower | 27° /15° | 8.1 mm | 6 | |
| 7 Sept. | Overcast | 26° /13° | 1.3 mm | 6 | |
| 8 Sept. | Moderate or heavy rain shower | 23° /15° | 23.7 mm | 5 | |
| 9 Sept. | Moderate or heavy rain shower | 27° /15° | 11.3 mm | 6 | |
| 10 Sept. | Patchy rain possible | 29° /16° | 3.8 mm | 7 | |
| 11 Sept. | Moderate or heavy rain shower | 28° /15° | 5.1 mm | 7 | |
| 12 Sept. | Patchy rain possible | 29° /16° | 1 mm | 7 | |
| 13 Sept. | Partly cloudy | 28° /15° | 3.1 mm | 6 | |
| 14 Sept. | Patchy rain possible | 29° /15° | 0.7 mm | 7 | |
| 15 Sept. | Patchy rain possible | 27° /17° | 2.1 mm | 6 | |
| 16 Sept. | Patchy rain possible | 28° /15° | 3.3 mm | 6 | |
| 17 Sept. | Light rain shower | 28° /15° | 4.8 mm | 6 | |
| 18 Sept. | Moderate or heavy rain shower | 28° /16° | 12.4 mm | 6 | |
| 19 Sept. | Patchy rain possible | 27° /15° | 5.1 mm | 6 | |
| 20 Sept. | Partly cloudy | 26° /14° | 18.8 mm | 6 | |
| 21 Sept. | Sunny | 24° /13° | 2 mm | 6 | |
| 22 Sept. | Light rain shower | 23° /12° | 18 mm | 5 | |
| 23 Sept. | Patchy rain possible | 22° /10° | 13.5 mm | 5 | |
| 24 Sept. | Moderate rain at times | 22° /10° | 7.3 mm | 5 | |
| 25 Sept. | Partly cloudy | 25° /9° | 0.1 mm | 6 | |
| 26 Sept. | Moderate or heavy rain shower | 24° /11° | 3 mm | 6 | |
| 27 Sept. | Partly cloudy | 24° /12° | 7.8 mm | 6 | |
| 28 Sept. | Patchy rain possible | 23° /12° | 5.2 mm | 5 | |
| 29 Sept. | Partly cloudy | 24° /10° | 0.3 mm | 6 | |
| 30 Sept. | Moderate rain at times | 26° /11° | 0.7 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 26° 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 217.7 mm is expected in Nagano during September, occurring over more than 26 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
September rainfall patterns in Nagano
Explore the daily rainfall trends and prepare for Naganos September weather 💧
UV exposure in Nagano during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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