Weather in Nagano for September 2026
Until now, September 2026 in Nagano has been significantly cooler than historical averages by 5.1 °C, with average temperature of 21.1 °C.
Expect cooler weather in the next days in Nagano with the forecast suggesting a temperature of 22.1 °C, lower than the historical average.
In general, the average temperature in Nagano at the beginning of September is 26.4 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 23.6 °C by the end of September.
Nagano experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 217.5 mm.
Is September a good time to visit Nagano? check out the best time to travel to Nagano page.
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Nagano Weather September
What’s the Weather Like in Nagano This September?
Temperatures trend during September in Nagano
September weather in Nagano day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 29° /16° | 6 mm | 6 | |
| 2 Sept. | Light rain shower | 27° /17° | 10.4 mm | 5 | |
| 3 Sept. | Light rain shower | 26° /15° | 12 mm | 5 | |
| 4 Sept. |  Moderate or heavy rain shower | 25° /15° | 9.6 mm | 5 | |
| 5 Sept. | Moderate or heavy rain shower | 26° /15° | 15.9 mm | 6 | |
| 6 Sept. | Moderate or heavy rain shower | 26° /14° | 7 mm | 5 | |
| 7 Sept. | Patchy rain possible | 26° /14° | 5.8 mm | 5 | |
| 8 Sept. | Light rain shower | 23° /15° | 27 mm | 5 | |
| 9 Sept. | Moderate or heavy rain shower | 27° /15° | 14.3 mm | 5 | |
| 10 Sept. | Patchy rain possible | 27° /15° | 4.6 mm | 6 | |
| 11 Sept. | Moderate or heavy rain shower | 26° /15° | 7.3 mm | 6 | |
| 12 Sept. | Patchy rain possible | 28° /15° | 2.3 mm | 6 | |
| 13 Sept. |  Mist | 25° /18° | 5.5 mm | 7.8 | |
| 14 Sept. | Light rain shower | 26° /17° | 2.8 mm | 8.7 | |
| 15 Sept. | Light rain shower | 18° /16° | 11.7 mm | 3.2 | |
| 16 Sept. | Light rain shower | 19° /17° | 14.5 mm | 2.8 | |
| 17 Sept. | Light rain shower | 17° /16° | 16.9 mm | 1.8 | |
| 18 Sept. |  Partly cloudy | 22° /16° | 0 mm | 6 | |
| 19 Sept. | Patchy rain possible | 22° /16° | 4 mm | 5 | |
| 20 Sept. | Light rain shower | 19° /16° | 12.1 mm | 4 | |
| 21 Sept. |  Overcast | 24° /19° | 0 mm | 5 | |
| 22 Sept. | Overcast | 26° /20° | 3 mm | 6 | |
| 23 Sept. | Light rain shower | 24° /14° | 12.2 mm | 5 | |
| 24 Sept. | Patchy rain possible | 27° /17° | 1.6 mm | 6 | |
| 25 Sept. | Patchy rain possible | 18° /15° | 0.8 mm | 5 | |
| 26 Sept. | Overcast | 22° /14° | 0 mm | 6 | |
| 27 Sept. | Patchy rain possible | 24° /11° | 6.3 mm | 5 | |
| 28 Sept. | Patchy rain possible | 24° /11° | 4.2 mm | 5 | |
| 29 Sept. | Partly cloudy | 25° /10° | 2.1 mm | 6 | |
| 30 Sept. | Patchy rain possible | 25° /11° | 0.8 mm | 6 | |
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Nagano weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Patchy rain possible |
| Temperatures | 30°/18° | 26°/14° | 18°/6° |
| Rainfall | 256 mm | 218 mm | 152 mm |
| Wind | 8.7 km/h | 8.1 km/h | 8.8 km/h |
| Humidity | 82% | 84% | 80% |
| Rainy days | 30 days | 28 days | 28 days |
| Dry days | 1 days | 2 days | 3 days |
Planning a trip to Nagano? Discover the best time to visit
Nagano in September - FAQ
What are the expected maximum and minimum temperatures in Nagano during September?
How much rainfall should be expected in Nagano during September?
What are the typical wind conditions in Nagano during September?
September rainfall patterns in Nagano
UV exposure in Nagano during September
What to pack to Nagano in September?
Warm & sunny · highs around 26 °C, frequent showers
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
👟 Footwear
🎒 Accessories
🧴 Personal Items
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Where is Nagano?Get accurate weather forecasts for Nagano, located at latitude 36.65 and longitude 138.183. Stay updated with localized weather information tailored for Nagano.