Hayward has a warm temperate climate with warm summers and mild winters.
Temperatures peak in August and drop to their lowest in December, while rainfall is highest during winter months.
Humidity remains moderate throughout the year, especially during winter months, creating cold and damp conditions.
| Month | 🌤️ | Avg High | Avg Temp | Avg Low | Record High | Record Low | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|---|---|
| January | ☔ | 57.2°F | 48.4°F | 39.5°F | 74.1°F | 22.6°F | 83% | 105 | 1.7 | 2.42 |
| February | ☔ | 58.8°F | 49.7°F | 40.6°F | 76.5°F | 20.1°F | 83% | 100 | 1.8 | 3.31 |
| March | ☔ | 61.3°F | 51.7°F | 42.0°F | 83.3°F | 29.3°F | 82% | 87 | 1.9 | 4.62 |
| April | 🌤️ | 65.9°F | 54.8°F | 43.6°F | 92.3°F | 30.6°F | 78% | 35 | 2.1 | 6.02 |
| May | ☀️ | 72.3°F | 59.8°F | 47.3°F | 100.4°F | 37.4°F | 73% | 16 | 2.5 | 6.74 |
| June | ☀️ | 80.2°F | 65.4°F | 50.7°F | 105.8°F | 41.9°F | 65% | 4 | 2.8 | 7.12 |
| July | ☀️ | 86.2°F | 69.8°F | 53.3°F | 113.5°F | 46.0°F | 60% | 0 | 2.8 | 6.53 |
| August | ☀️ | 87.1°F | 70.6°F | 54.1°F | 111.6°F | 46.6°F | 61% | 1 | 2.5 | 5.85 |
| September | ☀️ | 85.2°F | 69.5°F | 53.8°F | 114.8°F | 44.2°F | 61% | 6 | 2.1 | 5.04 |
| October | ☀️ | 77.3°F | 63.8°F | 50.2°F | 106.7°F | 35.4°F | 64% | 29 | 1.8 | 3.90 |
| November | 🌤️ | 65.1°F | 54.5°F | 43.9°F | 90.0°F | 24.1°F | 74% | 65 | 1.7 | 2.83 |
| December | ☔ | 57.3°F | 48.3°F | 39.4°F | 74.3°F | 20.1°F | 81% | 106 | 1.8 | 2.18 |
Showing average climate conditions across 45 years (1981–2025)
🧥 Light layers are sufficient — this Mild Winter stays cool without prolonged hard freezes.
🌤️ Early mornings and evenings are most comfortable during this Hot Summer season.
☔ Moderate Rainfall expected — carry rain gear and plan outdoor activities around these months.
Monthly averages · 1981–2025 climate normals · °F
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.
Monthly rainfall · 1981–2025 seasonal trends · mm/month
Rainfall is concentrated in the winter months. Humidity stays moderate (around 72%), peaking during winter months, which creates cold and damp conditions.
☔ Moderate Rainfall expected — carry rain gear and plan outdoor activities around these months.
Monthly averages · 1981–2025
Across 45 years of records, Hayward's temperature has remained relatively stable over the past decade. Its hottest day reached 114.8°F in September 2022, and its coldest dropped to 20.1°F in December 1990. 2014 was the warmest year overall and 1982 the coolest.
The warmest year in Hayward's recorded history was 2014 (avg: 61.7°F), while the coldest was 1982 (avg: 56.1°F).
Average annual high/low · Last 30 years · °F
Total annual precipitation · Last 30 years · mm/year
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|---|---|
2025 | 71.1°F | 59.2°F | 47.5°F | 103.5°F | 30.4°F | 502 | 76% | 2.2 m/s |
2024 | 72.0°F | 60.1°F | 48.2°F | 109.8°F | 33.3°F | 674 | 74% | 2.2 m/s |
2023 | 69.4°F | 58.1°F | 46.8°F | 102.7°F | 28.2°F | 757 | 75% | 2.2 m/s |
2022 | 72.0°F | 59.4°F | 46.6°F | 114.8°F | 27.5°F | 440 | 71% | 2.1 m/s |
2021 | 71.8°F | 59.2°F | 46.6°F | 105.8°F | 30.6°F | 568 | 71% | 2.3 m/s |
2020 | 73.9°F | 60.8°F | 47.7°F | 112.6°F | 26.1°F | 246 | 69% | 2.0 m/s |
2019 | 70.5°F | 59.0°F | 47.5°F | 104.7°F | 26.2°F | 741 | 73% | 2.2 m/s |
2018 | 72.0°F | 59.4°F | 46.9°F | 99.5°F | 29.3°F | 481 | 70% | 2.1 m/s |
2017 | 71.2°F | 59.5°F | 47.8°F | 112.6°F | 28.2°F | 783 | 72% | 2.1 m/s |
2016 | 70.9°F | 59.2°F | 47.7°F | 104.5°F | 26.2°F | 686 | 75% | 2.1 m/s |
Showing 1 to 10 of 45 years
Based on 45 years of data (1981–2025), August is typically the hottest month in Hayward, California, with average high temperatures around 87.1°F.
December is the coldest month in Hayward, with average low temperatures around 39.4°F.
December receives the most rainfall with approximately 106 mm, while July is the driest with 0 mm.
The highest recorded temperature was 114.8°F in September 2022. This is part of the historical record spanning 1981–2025.
The lowest recorded temperature was 20.1°F in December 1990.
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
Hayward receives the most sunlight in June with an average solar radiation of 7.12 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning and agriculture in California.
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
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.
