Gunma has a temperate climate with warm summers and cold winters.
Gunma has an average annual temperature of 11.4°C across all 26 cities, with approximately 1385 mm of annual precipitation and average humidity of 82%. Temperatures peak in August and drop to their lowest in February, while rainfall is highest during autumn months.
The warmest city is Meiwa with average July highs of 34.6°C, while Higashiagatsuma is the coldest with average January lows of -12.8°C. Humidity remains high throughout the year, especially in autumn, creating cold and damp conditions. These seasonal patterns make summer pleasant for travel, while winters can bring frost and occasional snowfall.
| Month | 🌤️ | High | Low | Avg | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|
| January | ❄️ | 7.9°C | -9.5°C | -0.8°C | 84% | 57 | 2.5 | 2.50 |
| February | 🌤️ | 10.5°C | -9.7°C | 0.4°C | 83% | 54 | 2.7 | 3.30 |
| March | ⛅ | 16.6°C | -7.4°C | 4.6°C | 80% | 88 | 2.6 | 4.10 |
| April | ⛅ | 22.6°C | -3.3°C | 9.6°C | 77% | 98 | 2.3 | 4.90 |
| May | ⛅ | 26.3°C | 2.1°C | 14.2°C | 77% | 116 | 1.9 | 5.10 |
| June | 🌧️ | 28.8°C | 8.4°C | 18.6°C | 81% | 157 | 1.6 | 4.60 |
| July | 🌧️ | 31.5°C | 14.1°C | 22.8°C | 83% | 177 | 1.5 | 4.60 |
| August | 🌧️ | 31.7°C | 15.3°C | 23.5°C | 83% | 168 | 1.5 | 4.70 |
| September | 🌧️ | 29.4°C | 9.2°C | 19.3°C | 85% | 193 | 1.6 | 3.70 |
| October | ⛅ | 24.5°C | 2.4°C | 13.4°C | 84% | 143 | 1.7 | 3.10 |
| November | 🌤️ | 18.5°C | -2.7°C | 7.9°C | 84% | 76 | 1.8 | 2.60 |
| December | 🌤️ | 12.9°C | -6.8°C | 3.0°C | 84% | 58 | 2.1 | 2.30 |
Showing average climate conditions across 45 years (1981–2025) · averaged across all 26 cities in Gunma
🧥 Expect frosty nights and below-freezing temperatures during this Cold Winter period.
🌤️ Early mornings and evenings are most comfortable during this Hot Summer season.
☔ Heavy Rainfall expected — carry rain gear and plan outdoor activities around these months.
Region-wide monthly averages across 26 cities · 1981–2025 · °C
Temperatures rise steadily from spring, peak in August, and gradually decline through autumn into winter.
These seasonal patterns make summer pleasant for travel, while winters can bring frost and occasional snowfall.
Region-wide monthly rainfall · 1981–2025 · mm/month
Monthly averages · 1981–2025
💧 Humidity peaks at 85% in September · annual avg 82%
The warmest year on record was 2024 (avg: 13.1°C), while the coldest year was 1984 (avg: 10.1°C).
Averaged across all 26 cities in Gunma · Last 10 years · °C
Averaged across all 26 cities in Gunma · Last 10 years · mm/year
🔥 hottest · ❄️ coldest · 🌧️ wettest
ℹ️ Values are averages across all 26 cities in Gunma for each year.
| Year | Min Temp | Avg Temp | Max Temp | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|
2025 | 2.1°C | 12.7°C | 23.3°C | 1529 | 83% | 1.9 m/s |
2024 | 2.6°C | 13.1°C | 23.6°C | 1754 | 83% | 1.9 m/s |
2023 | 2.8°C | 13.1°C | 23.4°C | 1533 | 81% | 1.9 m/s |
2022 | 1.7°C | 11.9°C | 22.0°C | 1436 | 83% | 1.9 m/s |
2021 | 2.0°C | 12.0°C | 22.0°C | 1623 | 83% | 2.0 m/s |
2020 | 2.4°C | 12.1°C | 21.9°C | 1529 | 83% | 1.9 m/s |
2019 | 2.1°C | 12.4°C | 22.6°C | 1541 | 82% | 2.0 m/s |
2018 | 1.5°C | 12.3°C | 23.1°C | 1355 | 82% | 1.9 m/s |
2017 | 1.4°C | 11.4°C | 21.3°C | 1382 | 82% | 2.0 m/s |
2016 | 0.8°C | 11.6°C | 22.4°C | 1487 | 83% | 1.9 m/s |
Showing 1 to 10 of 45 years
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.
