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Weather in Gunma for September 2025

Your guide to Gunma weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Gunma is slightly cooler than the historical average by -0.6 °C.

  • The forecast for the next days in Gunma predicts temperatures to be around 18 °C, close to the historical average.

  • In general, the average temperature in Gunma at the beginning of September is 26.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.1 °C by the end of September.

    • Rain 🌧️

  • Gunma experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 140.7 mm.

    • More

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

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

Average dry days
6
Dry days
Average rainy days
24
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/16°
Temperatures
Average wind speed
8 km/h
Avg max wind
Average humidity
86 %
Avg humidity

Gunma Weather September

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

What’s the Weather Like in Gunma This September?

Discover the average temperatures and weather trends across Gunma’s cities this September.
Patchy rain possibleKusatsu24 °C / 16 °CPatchy rain possibleMinakami24 °C / 16 °CMore Locations

Temperatures trend during September in Gunma

See the weather trend as well as the moving average line

September weather in Gunma day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 29° /18° 1.6 mm 7
2 Sept. Patchy rain possible
Patchy rain possible
 30° /18° 3.7 mm 7
3 Sept. Light rain shower
Light rain shower
 25° /17° 10.9 mm 6
4 Sept. Patchy rain possible
Patchy rain possible
 22° /15° 3.6 mm 5
5 Sept. Patchy rain possible
Patchy rain possible
 24° /16° 27.7 mm 6
6 Sept. Patchy rain possible
Patchy rain possible
 27° /16° 0 mm 7
7 Sept. Patchy rain possible
Patchy rain possible
 28° /17° 1.9 mm 6
8 Sept. Light rain shower
Light rain shower
 26° /18° 14.4 mm 6
9 Sept. Light rain shower
Light rain shower
 26° /18° 6.7 mm 6
10 Sept. Light rain shower
Light rain shower
 24° /18° 8.5 mm 6
11 Sept. Light rain shower
Light rain shower
 24° /17° 10 mm 6
12 Sept. Light rain shower
Light rain shower
 22° /17° 8.8 mm 5
13 Sept. Light rain shower
Light rain shower
 24° /18° 7.8 mm 6
14 Sept. Light rain shower
Light rain shower
 26° /18° 4.7 mm 6
15 Sept. Light rain shower
Light rain shower
 24° /18° 5.4 mm 6
16 Sept. Light rain shower
Light rain shower
 25° /18° 3.8 mm 6
17 Sept. Light rain shower
Light rain shower
 26° /19° 3.8 mm 6
18 Sept. Patchy rain possible
Patchy rain possible
 26° /16° 1.9 mm 1.1
19 Sept. Patchy rain possible
Patchy rain possible
 16° /13° 4.6 mm 0.2
20 Sept. Moderate rain
Moderate rain
 18° /14° 7.2 mm 0.2
21 Sept. Patchy rain possible
Patchy rain possible
 21° /13° 2.1 mm 1.6
22 Sept. Patchy rain possible
Patchy rain possible
 14° /12° 3 mm 3
23 Sept. Patchy rain possible
Patchy rain possible
 16° /11° 0.3 mm 3
24 Sept. Patchy rain possible
Patchy rain possible
 17° /12° 0.1 mm 3
25 Sept. Moderate rain
Moderate rain
 13° /12° 6.9 mm 3
26 Sept. Patchy rain possible
Patchy rain possible
 22° /12° 0.7 mm 4
27 Sept. Sunny
Sunny
 20° /12° 0 mm 4
28 Sept. Patchy rain possible
Patchy rain possible
 17° /12° 0.2 mm 3
29 Sept. Moderate rain
Moderate rain
 15° /13° 10.4 mm 3
30 Sept. Patchy rain possible
Patchy rain possible
 16° /15° 1.5 mm 4
Next
Important Notice
Our weather forecast for Gunma 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 Gunma forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Gunma weather in September vs August vs October

Compare September weather in Gunma 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
Temperatures26°/19°24°/16°16°/10°
Rainfall294 mm141 mm168 mm
Wind7.5 km/h8.4 km/h8.6 km/h
Humidity85%86%85%
Rainy days27 days24 days14 days
Dry days4 days6 days17 days

Planning a trip to Gunma? Discover the best time to visit

Gunma in September - FAQ

What are the expected maximum and minimum temperatures in Gunma during September?
During September, expect a variety of temperatures with highs around 24° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Gunma during September?
Significant rainfall exceeding 140.7 mm is expected in Gunma during September, occurring over more than 24 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Gunma during September?
The average wind speed in Gunma during September is 8 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Gunma in September?

As you prepare for your trip to Gunma 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 Gunma, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants
    • Rain Gear: Lightweight, waterproof clothing
  • Footwear
    • Waterproof Shoes
  • Accessories
    • Sunglasses: For sun protection
    • Sun Hats: Wide-brimmed hats for sun protection in warm weather
    • Umbrellas/Raincoats: For rainy days

September rainfall patterns in Gunma

Explore the daily rainfall trends and prepare for Gunmas September weather 💧

UV exposure in Gunma during September

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

Get accurate weather forecasts for Gunma, located at latitude 36.617 and longitude 138.6. Stay updated with localized weather information tailored for Gunma.

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