Shimane has a warm temperate climate with warm summers and mild winters.
Shimane has an average annual temperature of 14.8°C across all 15 cities, with approximately 1639 mm of annual precipitation and average humidity of 79%. Temperatures peak in August and drop to their lowest in February, while rainfall is highest during summer months.
The warmest city is Masuda with average July highs of 28.6°C, while Okuizumo is the coldest with average January lows of -2.4°C. Humidity remains high throughout the year creating warm and humid conditions. These seasonal patterns offer comfortable conditions year-round, with warm summers and mild winters.
| Month | 🌤️ | Avg High | Avg Temp | Avg Low | Record High | Record Low | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|---|---|
| January | ⛅ | 6.8°C | 4.6°C | 2.5°C | 18.1°C | -9.0°C | 79% | 102 | 4.9 | 1.80 |
| February | ⛅ | 7.3°C | 4.9°C | 2.4°C | 18.5°C | -11.2°C | 77% | 93 | 4.7 | 2.50 |
| March | ⛅ | 10.7°C | 7.7°C | 4.6°C | 21.7°C | -6.5°C | 76% | 117 | 4.4 | 3.70 |
| April | ⛅ | 15.7°C | 12.3°C | 8.9°C | 26.2°C | -3.8°C | 77% | 119 | 4.0 | 4.80 |
| May | ⛅ | 19.9°C | 16.7°C | 13.4°C | 29.4°C | 1.1°C | 79% | 138 | 3.5 | 5.30 |
| June | 🌧️ | 23.6°C | 20.8°C | 17.9°C | 33.3°C | 6.7°C | 82% | 198 | 3.0 | 4.90 |
| July | 🌧️ | 27.1°C | 24.7°C | 22.2°C | 35.5°C | 10.3°C | 85% | 221 | 3.2 | 4.90 |
| August | ⛅ | 28.7°C | 26.2°C | 23.7°C | 37.1°C | 12.8°C | 82% | 137 | 3.3 | 5.10 |
| September | 🌧️ | 25.2°C | 22.7°C | 20.2°C | 35.1°C | 5.9°C | 80% | 192 | 3.7 | 4.00 |
| October | ⛅ | 20.0°C | 17.3°C | 14.6°C | 28.9°C | 0.9°C | 77% | 114 | 3.8 | 3.30 |
| November | ⛅ | 14.9°C | 12.3°C | 9.6°C | 25.4°C | -3.0°C | 77% | 102 | 4.2 | 2.30 |
| December | ⛅ | 9.6°C | 7.2°C | 4.9°C | 21.3°C | -6.8°C | 79% | 106 | 4.8 | 1.70 |
Showing average climate conditions across 45 years (1981–2025) · averaged across all 15 cities in Shimane
🧥 Light layers are sufficient — this Mild Winter stays cool without prolonged hard freezes.
🌤️ Conditions are ideal for outdoor activities throughout the day in this Mild Summer.
☔ Heavy Rainfall expected — carry rain gear and plan outdoor activities around these months.
Region-wide monthly averages across 15 cities · 1981–2025 · °C
Temperatures rise steadily from spring, peak in August, and gradually decline through autumn into winter.
These seasonal patterns offer comfortable conditions year-round, with warm summers and mild winters.
Region-wide monthly rainfall · 1981–2025 · mm/month
💧 Humidity peaks at 85% in July · annual avg 79%
Monthly averages · 1981–2025
Across 45 years, Shimane's temperature shows a slight warming trend over the past decade. 2024 was the warmest year overall and 1986 the coolest.
The warmest year on record was 2024 (avg: 16.2°C), while the coldest year was 1986 (avg: 13.7°C).
Averaged across all 15 cities in Shimane · Last 30 years · °C
Averaged across all 15 cities in Shimane · Last 30 years · mm/year
🔥 hottest · ❄️ coldest · 🌧️ wettest
ℹ️ Values are averages across all 15 cities in Shimane for each year.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|---|---|
2025 | 18.3°C | 15.7°C | 13.1°C | 34.6°C | -7.2°C | 1957 | 79% | 4.0 m/s |
2024 🔥 🌧️ | 18.8°C | 16.2°C | 13.6°C | 34.3°C | -5.2°C | 2216 | 81% | 4.0 m/s |
2023 | 18.8°C | 16.1°C | 13.4°C | 33.6°C | -8.9°C | 2074 | 79% | 3.8 m/s |
2022 | 18.2°C | 15.5°C | 12.8°C | 35.1°C | -5.0°C | 1347 | 77% | 3.9 m/s |
2021 | 18.2°C | 15.6°C | 12.9°C | 33.2°C | -7.0°C | 2080 | 79% | 4.1 m/s |
2020 | 18.0°C | 15.4°C | 12.7°C | 34.6°C | -4.9°C | 2042 | 79% | 4.0 m/s |
2019 | 18.3°C | 15.6°C | 12.8°C | 34.4°C | -4.2°C | 1490 | 78% | 3.7 m/s |
2018 | 17.8°C | 15.1°C | 12.4°C | 35.5°C | -9.4°C | 2049 | 79% | 3.9 m/s |
2017 | 17.4°C | 14.8°C | 12.2°C | 33.2°C | -6.7°C | 1878 | 78% | 4.0 m/s |
2016 | 18.0°C | 15.3°C | 12.6°C | 33.8°C | -8.8°C | 2101 | 81% | 3.8 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.
