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Nagano Shi (Nagano)
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Weather in Nagano Shi for September 2025

Your guide to Nagano Shi weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Nagano Shi has been nearly identical to the historical average, with a temperature of 27.9 °C (showing only a slight deviation of 0.5 °C).

  • The forecast for the next days in Nagano Shi predicts temperatures to be around 21 °C, close to the historical average.

  • In general, the average temperature in Nagano Shi at the beginning of September is 27.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.6 °C by the end of September.

    • Rain 🌧️

  • Nagano Shi experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 217.7 mm.

    • More

  • Is September a good time to visit Nagano Shi? check out the best time to travel to Nagano Shi page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
4
Dry days
Average rainy days
26
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/14°
Temperatures
Average wind speed
8 km/h
Avg max wind
Average humidity
84 %
Avg humidity

Nagano Shi Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
29°
2
Moderate rain at times
27°
3
Light rain shower
27°
4
Moderate or heavy rain shower
27°
5
Moderate or heavy rain shower
27°
6
Moderate or heavy rain shower
27°
7
Patchy rain possible
27°
8
Moderate or heavy rain shower
24°
9
Light rain shower
28°
10
Patchy rain possible
29°
11
Light rain shower
27°
12
Light rain shower
28°
13
Light rain shower
28°
14
Patchy rain possible
28°
15
Light rain shower
27°
16
Patchy rain possible
28°
17
Light rain shower
28°
18
Moderate or heavy rain shower
28°
19
Patchy rain possible
22°
20
Moderate rain
20°
21
Moderate rain
19°
22
Patchy rain possible
21°
23
Patchy rain possible
22°
24
Patchy rain possible
19°
25
Patchy rain possible
20°
26
Patchy rain possible
23°
27
Patchy rain possible
21°
28
Patchy rain possible
22°
29
Patchy rain possible
24°
30
Patchy rain possible
22°

Temperatures trend during September in Nagano Shi

See the weather trend as well as the moving average line

September weather in Nagano Shi day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Patchy rain possible
Patchy rain possible
 29° /16° 6 mm 6
2 Sept. Moderate rain at times
Moderate rain at times
 27° /16° 11.3 mm 6
3 Sept. Light rain shower
Light rain shower
 27° /15° 11.2 mm 6
4 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 27° /15° 10.8 mm 6
5 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 27° /15° 19 mm 6
6 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 27° /14° 6.5 mm 6
7 Sept. Patchy rain possible
Patchy rain possible
 27° /13° 1.1 mm 6
8 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 24° /15° 19.2 mm 5
9 Sept. Light rain shower
Light rain shower
 28° /15° 9.8 mm 6
10 Sept. Patchy rain possible
Patchy rain possible
 29° /16° 5.5 mm 6
11 Sept. Light rain shower
Light rain shower
 27° /15° 7.5 mm 6
12 Sept. Light rain shower
Light rain shower
 28° /15° 1.9 mm 7
13 Sept. Light rain shower
Light rain shower
 28° /15° 3.6 mm 6
14 Sept. Patchy rain possible
Patchy rain possible
 28° /15° 4.7 mm 6
15 Sept. Light rain shower
Light rain shower
 27° /16° 2.9 mm 6
16 Sept. Patchy rain possible
Patchy rain possible
 28° /15° 2.8 mm 6
17 Sept. Light rain shower
Light rain shower
 28° /15° 4.4 mm 6
18 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 28° /16° 12.4 mm 6
19 Sept. Patchy rain possible
Patchy rain possible
 22° /17° 0.6 mm 0.9
20 Sept. Moderate rain
Moderate rain
 20° /16° 19.4 mm 0.6
21 Sept. Moderate rain
Moderate rain
 19° /14° 10.1 mm 0.9
22 Sept. Patchy rain possible
Patchy rain possible
 21° /11° 0.6 mm 1.6
23 Sept. Patchy rain possible
Patchy rain possible
 22° /11° 0.1 mm 1.6
24 Sept. Patchy rain possible
Patchy rain possible
 19° /14° 0.3 mm 4
25 Sept. Patchy rain possible
Patchy rain possible
 20° /13° 4.5 mm 4
26 Sept. Patchy rain possible
Patchy rain possible
 23° /15° 3.6 mm 4
27 Sept. Patchy rain possible
Patchy rain possible
 21° /9° 1 mm 4
28 Sept. Patchy rain possible
Patchy rain possible
 22° /7° 0.1 mm 3
29 Sept. Patchy rain possible
Patchy rain possible
 24° /9° 0.5 mm 4
30 Sept. Patchy rain possible
Patchy rain possible
 22° /11° 2.8 mm 3
Next
Important Notice
Our weather forecast for Nagano Shi 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 Shi forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Nagano Shi weather in September vs August vs October

Compare September weather in Nagano Shi with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
AugustSeptemberOctober
WeatherPatchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures30°/18°26°/14°18°/6°
Rainfall264 mm218 mm152 mm
Wind8.5 km/h8 km/h8.8 km/h
Humidity82%84%80%
Rainy days29 days26 days26 days
Dry days2 days4 days5 days

Planning a trip to Nagano Shi? Discover the best time to visit

Nagano Shi in September - FAQ

What are the expected maximum and minimum temperatures in Nagano Shi 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 Shi during September?
Significant rainfall exceeding 217.7 mm is expected in Nagano Shi 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 Shi during September?
The average wind speed in Nagano Shi during September is 8 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Nagano Shi in September?

As you prepare for your trip to Nagano Shi 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 Shi, 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 Shi

Explore the daily rainfall trends and prepare for Nagano Shis September weather 💧

UV exposure in Nagano Shi during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Nagano Shi?

Get accurate weather forecasts for Nagano Shi, located at latitude 36.65 and longitude 138.183. Stay updated with localized weather information tailored for Nagano Shi.

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