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Hayward Weather by Month
Average temperatures, rainfall and humidity for Hayward, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Hayward month looks like before you travel — then check the live Hayward forecast for the days ahead.
Warmest month
September
27°C average high
Coolest month
January
7°C average low
Wettest month
December
86 mm of rain
Driest month
August
7 mm of rain
Average temperature and rainfall in Hayward by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 15°C | 7°C | -6°C / 26°C | 72 mm | 75% | 10 km/h |
| February | 17°C | 7°C | -2°C / 27°C | 64 mm | 72% | 11 km/h |
| March | 19°C | 8°C | 0°C / 32°C | 66 mm | 72% | 12 km/h |
| April | 21°C | 9°C | 0°C / 32°C | 37 mm | 69% | 14 km/h |
| May | 23°C | 11°C | 3°C / 34°C | 25 mm | 70% | 14 km/h |
| June | 26°C | 13°C | 6°C / 38°C | 13 mm | 68% | 13 km/h |
| July | 27°C | 14°C | 8°C / 37°C | 12 mm | 70% | 12 km/h |
| August | 27°C | 15°C | 9°C / 39°C | 7 mm | 71% | 12 km/h |
| September | 27°C | 14°C | 8°C / 41°C | 9 mm | 68% | 11 km/h |
| October | 24°C | 12°C | 3°C / 38°C | 17 mm | 66% | 9 km/h |
| November | 19°C | 9°C | -3°C / 32°C | 44 mm | 71% | 9 km/h |
| December | 15°C | 7°C | -4°C / 22°C | 86 mm | 75% | 10 km/h |
Best time to visit Hayward
The most comfortable time to visit Hayward is generally May to June and October, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around December, totalling about 452 mm a year.
Travellers who prefer heat should aim for September, when highs average 27°C. December is the month to avoid if rain would spoil your plans — it averages 86 mm, roughly 12× the rainfall of the driest month (August).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Hayward forecast for what is happening now.