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Hayward, CA Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Hayward, CA?
Hayward, CA gets 16.0 in of precipitation a year over about 60 rainy days. September is the warmest month (average high 76°F) and January the coldest (average low 43°F).
Mediterranean climate
Hayward, CA has warm summers and mild winters. Daytime highs range from about 59°F in January to 76°F in September. December is usually the wettest month. The most comfortable time to visit is typically March to November, when daytime highs sit near 71°F.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 44° | 59° |
| Spring | Mar–May | 50° | 66° |
| Summer | Jun–Aug | 57° | 74° |
| Autumn | Sep–Nov | 53° | 71° |
How much rain does Hayward get?
Hayward gets 16.0 in of precipitation in an average year, spread over about 60 days with measurable rain. That is fewer rainy days than 76% of the US.
December is the wettest month, with 3.2 in. July is the driest, with 0.0 in. December has the most rainy days, about 10.
The longest dry spell in the last five years lasted 119 days, to September 8, 2025.
From September 2025 to August 2026 Hayward got 19.6 in of rain, against a normal of 16.0 in for those months. April 2026 had the most, with 3.9 in.
See where Hayward ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in California.
Hayward weather by month
Hayward weather in January
In January, Hayward averages a high of 59°F and a low of 43°F. It gets 2.9 in of precipitation over about 10 rainy days. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. The January record high is 79°F (2021) and the record low is 28°F (2007).
Hayward weather in February
In February, Hayward averages a high of 61°F and a low of 45°F. It gets 3.1 in of precipitation over about 9 rainy days. Estimated sunshine is 58% of daylight hours, derived from ERA5 cloud cover. The February record high is 81°F (2018) and the record low is 33°F (2018).
Hayward weather in March
In March, Hayward averages a high of 64°F and a low of 47°F. It gets 2.4 in of precipitation over about 9 rainy days. Estimated sunshine is 47% of daylight hours, derived from ERA5 cloud cover. The March record high is 88°F (2026) and the record low is 36°F (2002). March is one of the most comfortable months to visit.
Hayward weather in April
In April, Hayward averages a high of 66°F and a low of 50°F. It gets 1.2 in of precipitation over about 6 rainy days. Estimated sunshine is 59% of daylight hours, derived from ERA5 cloud cover. The April record high is 95°F (2009) and the record low is 36°F (1999). April is one of the most comfortable months to visit.
Hayward weather in May
In May, Hayward averages a high of 69°F and a low of 53°F. It gets 0.6 in of precipitation over about 3 rainy days. Estimated sunshine is 65% of daylight hours, derived from ERA5 cloud cover. The May record high is 99°F (2008) and the record low is 41°F (2022). May is one of the most comfortable months to visit.
Hayward weather in June
In June, Hayward averages a high of 73°F and a low of 56°F. It gets 0.1 in of precipitation over about 1 rainy days. Estimated sunshine is 69% of daylight hours, derived from ERA5 cloud cover. The June record high is 104°F (2000) and the record low is 47°F (2014). June is one of the most comfortable months to visit.
Hayward weather in July
In July, Hayward averages a high of 75°F and a low of 58°F. It gets 0.0 in of precipitation over about 0 rainy days. Estimated sunshine is 73% of daylight hours, derived from ERA5 cloud cover. The July record high is 105°F (2006) and the record low is 53°F (1999). July is one of the most comfortable months to visit.
Hayward weather in August
In August, Hayward averages a high of 75°F and a low of 59°F. It gets 0.1 in of precipitation over about 0 rainy days. Estimated sunshine is 73% of daylight hours, derived from ERA5 cloud cover. The August record high is 103°F (2020) and the record low is 53°F (2012). August is one of the most comfortable months to visit.
Hayward weather in September
In September, Hayward averages a high of 76°F and a low of 58°F. It gets 0.1 in of precipitation over about 1 rainy days. Estimated sunshine is 72% of daylight hours, derived from ERA5 cloud cover. The September record high is 108°F (2017) and the record low is 47°F (2013). September is one of the most comfortable months to visit.
Hayward weather in October
In October, Hayward averages a high of 73°F and a low of 54°F. It gets 0.8 in of precipitation over about 3 rainy days. Estimated sunshine is 68% of daylight hours, derived from ERA5 cloud cover. The October record high is 102°F (2024) and the record low is 43°F (2002). October is one of the most comfortable months to visit.
Hayward weather in November
In November, Hayward averages a high of 64°F and a low of 48°F. It gets 1.5 in of precipitation over about 7 rainy days. Estimated sunshine is 57% of daylight hours, derived from ERA5 cloud cover. The November record high is 85°F (2008) and the record low is 33°F (2010). November is one of the most comfortable months to visit.
Hayward weather in December
In December, Hayward averages a high of 59°F and a low of 43°F. It gets 3.2 in of precipitation over about 10 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The December record high is 76°F (2020) and the record low is 27°F (1998).
Sunshine, humidity and wind in Hayward
July is the sunniest month in Hayward, with estimated sunshine of 73% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 36%. The annual cloud-cover estimate is 60% of daylight hours; it is not a measurement of sunshine duration. Hayward is sunnier than 85% of the US.
Humidity peaks in December at 78% and is lowest in October at 58%.
Wind averages 7 mph over the year, and May is the windiest month at 9 mph.
Hayward has about 9 days a year above 90°F. Hayward is cooler than 81% of the US.
Thunderstorms occur on about 5 days a year.
See where Hayward ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
Hayward weather records
These records cover HAYWARD AIR TERMINAL during 1998–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Hayward station is 108°F, on September 2, 2017. The coldest is 27°F, on December 23, 1998.
The wettest day in the available station history brought 4.3 in of precipitation, on December 31, 2022.
The best time to visit Hayward
The most comfortable time to visit is typically March to November, when daytime highs sit near 71°F.
Winter (December–February) is mild, with average highs around 59°F and lows near 44°F.
Spring (March–May) is mild, with average highs around 66°F and lows near 50°F.
Summer (June–August) is warm, with average highs around 74°F and lows near 57°F.
Autumn (September–November) is warm, with average highs around 71°F and lows near 53°F.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Wind | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|---|
| January | 43° | 59° | 2.9 in | 10 | 5 mph | 76% | 37% | 79° | 28° |
| February | 45° | 61° | 3.1 in | 9 | 6 mph | 63% | 58% | 81° | 33° |
| March | 47° | 64° | 2.4 in | 9 | 7 mph | 66% | 47% | 88° | 36° |
| April | 50° | 66° | 1.2 in | 6 | 8 mph | 65% | 59% | 95° | 36° |
| May | 53° | 69° | 0.58 in | 3 | 9 mph | 62% | 65% | 99° | 41° |
| June | 56° | 73° | 0.15 in | 1 | 8 mph | 61% | 69% | 104° | 47° |
| July | 58° | 75° | 0.00 in | 0 | 8 mph | 63% | 73% | 105° | 53° |
| August | 59° | 75° | 0.10 in | 0 | 8 mph | 64% | 73% | 103° | 53° |
| September | 58° | 76° | 0.08 in | 1 | 7 mph | 64% | 72% | 108° | 47° |
| October | 54° | 73° | 0.81 in | 3 | 6 mph | 58% | 68% | 102° | 43° |
| November | 48° | 64° | 1.5 in | 7 | 5 mph | 65% | 57% | 85° | 33° |
| December | 43° | 59° | 3.2 in | 10 | 5 mph | 78% | 36% | 76° | 27° |
Station: HAYWARD AIR TERMINAL, 4 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1998–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Hayward climate questions
How much rain does Hayward get?
Hayward gets 16.0 in of precipitation in an average year, over about 60 rainy days.
What is the wettest month in Hayward?
December is the wettest month in Hayward, with 3.2 in. July is the driest, with 0.0 in.
How many rainy days does Hayward have a year?
Hayward has about 60 days with measurable rain in an average year. December has the most, about 10.
What is the hottest month in Hayward?
September is the warmest month in Hayward, with an average high of 76°F.
What is the coldest month in Hayward?
January is the coldest month in Hayward, with an average low of 43°F.
What is the record high temperature in Hayward?
Within the available 1998–2026 station history, the record high at the Hayward station is 108°F, set on September 2, 2017. The record low is 27°F, on December 23, 1998.
What is the sunniest month in Hayward?
July is the sunniest month in Hayward, with estimated sunshine of 73% of daylight hours from ERA5 cloud cover. December is the cloudiest.
What is the best time to visit Hayward?
The most comfortable time to visit is typically March to November, when daytime highs sit near 71°F.