Hayward (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Hayward.
Climate overview of Hayward
Temperatures in Hayward, California, United States of America, vary greatly throughout the year. September is the hottest month at 25°C (77°F), while December is the coldest at 14°C (57°F).
Hayward sees a moderate amount of rainfall, totalling around 505 mm (20 in) per year. It experiences a distinct dry season from May to October, creating some seasonal variation. Sunshine peaks in May, when the city sees around 10.8 hours of sunshine per day.
Hayward Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Hayward — and find the best time to visit.
Monthly Temperature in Hayward
The climate in Hayward is known for significant temperature differences throughout the year, making the weather dynamic. Average maximum daytime temperatures range from a comfortable 25°C (77°F) in September, the warmest time of the year, to a moderate 14°C (57°F) during cooler months like December.
At night, you can expect temperatures ranging from 13°C (55°F) in September to around 5°C (41°F) during December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Hayward
Generally, Hayward receives mid-range precipitation levels, with 505 mm (20 in) annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, December it receives high rainfall, averaging 109 mm (4.3 in) of precipitation, recorded across 14 rainy days. In contrast, the driest month August brings less rainfall, with 0.1 mm (0 in) over 0 rainy days. For more details, please visit our Hayward Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Hayward
Seasonal changes in sunshine hours are quite dramatic in Hayward. While May receives considerable daily sunshine with up to 10.8 hours, December marks the darkest time of the year, where sunshine is scarce with only 5.3 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Hayward by Month
The relative humidity is high throughout the year in Hayward.
The city experiences its highest humidity in January, reaching 80%. In June, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Hayward
Frequently asked questions about the climate in Hayward
What is the best time to visit Hayward?
May, June, July, August, September and October typically offer the most optimal weather in Hayward. In contrast, December tends to have less optimal conditions. Hayward has a distinct dry season from May to October.
What temperatures can I expect in Hayward?
Daytime highs range from 14°C (57°F) in December to 25°C (77°F) in September. Nighttime lows range from 5°C (41°F) to 13°C (55°F). Temperatures vary considerably through the year.
How much rain does Hayward get?
Annual rainfall is around 505 mm (20 in). December is the wettest month with 109 mm (4.3 in), while August is the driest with 0.1 mm (0 in).
How sunny is Hayward?
Hayward receives around 3,058 hours of sunshine per year. May is the sunniest month with 324 hours, while December is the cloudiest with just 160 hours. Overall, Hayward enjoys abundant sunshine.
Hayward 3-Day Forecast
Hayward (CA) 3-Day Forecast
Hayward on the map
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