Yamaguchi has a warm temperate climate with warm summers and cold winters.
Yamaguchi has an average annual temperature of 16.3°C across all 16 cities, with approximately 1639 mm of annual precipitation and average humidity of 79%. Temperatures peak in August and drop to their lowest in January, while rainfall is highest during summer months.
The warmest city is Mine with average July highs of 33.4°C, while Mine is the coldest with average January lows of -1.8°C. Humidity remains high throughout the year 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 | 🌤️ | 14.2°C | -0.8°C | 6.7°C | 76% | 63 | 2.9 | 2.10 |
| February | 🌤️ | 15.5°C | -0.4°C | 7.6°C | 75% | 75 | 2.8 | 2.90 |
| March | ⛅ | 18.5°C | 1.5°C | 10.0°C | 76% | 121 | 2.5 | 3.80 |
| April | ⛅ | 22.5°C | 4.8°C | 13.6°C | 77% | 136 | 2.0 | 4.90 |
| May | 🌧️ | 26.0°C | 9.9°C | 17.9°C | 79% | 158 | 1.7 | 5.30 |
| June | 🌧️ | 28.8°C | 14.7°C | 21.8°C | 83% | 253 | 1.4 | 4.80 |
| July | 🌧️ | 32.0°C | 19.9°C | 25.9°C | 85% | 256 | 1.4 | 5.00 |
| August | 🌧️ | 32.8°C | 21.4°C | 27.1°C | 83% | 165 | 1.7 | 5.10 |
| September | 🌧️ | 30.5°C | 16.7°C | 23.6°C | 81% | 181 | 2.0 | 4.10 |
| October | ⛅ | 26.0°C | 10.8°C | 18.4°C | 78% | 95 | 2.3 | 3.50 |
| November | 🌤️ | 21.7°C | 5.7°C | 13.7°C | 76% | 77 | 2.4 | 2.60 |
| December | 🌤️ | 16.9°C | 1.2°C | 9.1°C | 76% | 60 | 2.8 | 2.00 |
Showing average climate conditions across 45 years (1981–2025) · averaged across all 16 cities in Yamaguchi
🧥 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 16 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 July · annual avg 79%
The warmest year on record was 2024 (avg: 17.7°C), while the coldest year was 1986 (avg: 15.4°C).
Averaged across all 16 cities in Yamaguchi · Last 10 years · °C
Averaged across all 16 cities in Yamaguchi · Last 10 years · mm/year
🔥 hottest · ❄️ coldest · 🌧️ wettest
ℹ️ Values are averages across all 16 cities in Yamaguchi for each year.
| Year | Min Temp | Avg Temp | Max Temp | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|
2025 | 9.4°C | 17.0°C | 24.6°C | 2016 | 79% | 2.1 m/s |
2024 🔥 | 10.4°C | 17.7°C | 24.9°C | 2249 | 81% | 2.1 m/s |
2023 | 9.9°C | 17.4°C | 24.9°C | 2033 | 79% | 2.0 m/s |
2022 | 9.2°C | 16.5°C | 23.9°C | 1450 | 77% | 2.0 m/s |
2021 | 9.2°C | 16.7°C | 24.1°C | 2034 | 79% | 2.1 m/s |
2020 | 9.6°C | 16.7°C | 23.7°C | 2065 | 79% | 2.1 m/s |
2019 | 9.7°C | 17.0°C | 24.3°C | 1737 | 79% | 2.0 m/s |
2018 | 8.7°C | 16.7°C | 24.6°C | 1865 | 79% | 2.1 m/s |
2017 | 9.2°C | 16.3°C | 23.3°C | 1660 | 78% | 2.1 m/s |
2016 🌧️ | 9.2°C | 16.7°C | 24.2°C | 2305 | 81% | 2.0 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.
