Chiba has a warm temperate climate with warm summers and mild winters.
Chiba has an average annual temperature of 16.2°C across all 59 cities, with approximately 1583 mm of annual precipitation and average humidity of 78%. Temperatures peak in August and drop to their lowest in January, while rainfall is highest during autumn months.
The warmest city is Sakae with average July highs of 30.7°C, while Sakae is the coldest with average January lows of -1.4°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 | 🌤️ | 9.6°C | 6.3°C | 3.0°C | 20.4°C | -5.3°C | 73% | 61 | 4.0 | 2.60 |
| February | 🌤️ | 10.1°C | 6.6°C | 3.1°C | 22.8°C | -7.6°C | 73% | 68 | 4.2 | 3.30 |
| March | ⛅ | 13.3°C | 9.5°C | 5.8°C | 26.1°C | -4.9°C | 74% | 129 | 4.2 | 3.90 |
| April | ⛅ | 17.7°C | 14.0°C | 10.3°C | 29.9°C | -2.7°C | 76% | 133 | 4.0 | 4.70 |
| May | ⛅ | 21.6°C | 18.3°C | 14.9°C | 33.9°C | 2.0°C | 79% | 146 | 3.6 | 5.00 |
| June | 🌧️ | 24.5°C | 21.6°C | 18.8°C | 37.2°C | 8.6°C | 83% | 186 | 3.2 | 4.60 |
| July | 🌧️ | 27.9°C | 25.2°C | 22.5°C | 39.0°C | 12.3°C | 85% | 153 | 3.1 | 5.00 |
| August | ⛅ | 29.5°C | 26.8°C | 24.1°C | 37.9°C | 15.5°C | 83% | 138 | 3.1 | 5.20 |
| September | 🌧️ | 26.7°C | 24.0°C | 21.4°C | 38.4°C | 8.6°C | 82% | 206 | 3.5 | 3.90 |
| October | 🌧️ | 21.9°C | 18.9°C | 16.0°C | 32.9°C | 2.5°C | 79% | 200 | 3.6 | 3.00 |
| November | ⛅ | 17.2°C | 13.9°C | 10.7°C | 26.3°C | -2.2°C | 77% | 102 | 3.6 | 2.50 |
| December | 🌤️ | 12.3°C | 9.0°C | 5.6°C | 24.0°C | -4.9°C | 75% | 61 | 3.8 | 2.40 |
Showing average climate conditions across 45 years (1981–2025) · averaged across all 59 cities in Chiba
🧥 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 59 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 78%
Monthly averages · 1981–2025
Across 45 years, Chiba's temperature shows a slight warming trend over the past decade. 2024 was the warmest year overall and 1984 the coolest.
The warmest year on record was 2024 (avg: 17.8°C), while the coldest year was 1984 (avg: 14.9°C).
Averaged across all 59 cities in Chiba · Last 30 years · °C
Averaged across all 59 cities in Chiba · Last 30 years · mm/year
🔥 hottest · ❄️ coldest · 🌧️ wettest
ℹ️ Values are averages across all 59 cities in Chiba for each year.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|---|---|
2025 | 20.4°C | 17.3°C | 14.2°C | 36.8°C | -3.2°C | 1678 | 79% | 3.7 m/s |
2024 🔥 🌧️ | 20.8°C | 17.8°C | 14.7°C | 37.6°C | -3.7°C | 2146 | 80% | 3.6 m/s |
2023 | 20.7°C | 17.6°C | 14.4°C | 37.0°C | -4.9°C | 1720 | 78% | 3.5 m/s |
2022 | 19.5°C | 16.5°C | 13.4°C | 37.7°C | -3.5°C | 1632 | 80% | 3.7 m/s |
2021 | 19.9°C | 16.8°C | 13.6°C | 35.7°C | -3.8°C | 2021 | 78% | 3.7 m/s |
2020 | 19.8°C | 16.8°C | 13.8°C | 36.5°C | -3.6°C | 1705 | 80% | 3.6 m/s |
2019 | 19.9°C | 16.8°C | 13.6°C | 36.1°C | -3.7°C | 1868 | 78% | 3.6 m/s |
2018 | 20.1°C | 17.0°C | 13.8°C | 37.8°C | -5.1°C | 1486 | 79% | 3.7 m/s |
2017 | 19.2°C | 16.1°C | 12.9°C | 36.7°C | -3.4°C | 1526 | 78% | 3.6 m/s |
2016 | 19.8°C | 16.7°C | 13.5°C | 35.7°C | -3.9°C | 1738 | 79% | 3.5 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.
