Hercules
California, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Hercules, CA

January, like December, is a moderate winter month in Hercules, California, with temperature in the range of an average high of 56.3°F (13.5°C) and an average low of 43.9°F (6.6°C). In Hercules, the average high-temperature is relatively the same as in December - a still moderate 56.3°F (13.5°C). Weather in January »

The last month of the winter, February, is also a moderate month in Hercules, California, with temperature in the range of an average low of 44.2°F (6.8°C) and an average high of 58.8°F (14.9°C). In Hercules, the average high-temperature is almost the same as in January - a still mild 58.8°F (14.9°C). Weather in February »

March, the first month of the spring, in Hercules, is a comfortable month, with average temperature fluctuating between 46°F (7.8°C) and 61°F (16.1°C). In March, the average high-temperature is practically the same as in February - an enjoyable 61°F (16.1°C). Weather in March »

April, like March, in Hercules, California, is another enjoyable spring month, with temperature in the range of an average high of 65.7°F (18.7°C) and an average low of 47.8°F (8.8°C). In April, the average high-temperature is relatively the same as in March - a still enjoyable 65.7°F (18.7°C). Weather in April »

The last month of the spring, May, is a pleasant month in Hercules, California, with average temperature varying between 50.5°F (10.3°C) and 69.3°F (20.7°C). In Hercules, California, the average high-temperature in May is essentially the same as in April - an agreeable 69.3°F (20.7°C). Weather in May »

June, the first month of the summer, in Hercules, is a moderately hot month, with temperature in the range of an average high of 74.8°F (23.8°C) and an average low of 54.3°F (12.4°C). In June, the average high-temperature slightly increases, from a pleasant 69.3°F (20.7°C) in May, to a moderately hot 74.8°F (23.8°C). Weather in June »

July, like June, in Hercules, California, is another warm summer month, with average temperature varying between 55.4°F (13°C) and 76.6°F (24.8°C). In Hercules, the average high-temperature in July is practically the same as in June - a still moderately hot 76.6°F (24.8°C). Weather in July »

The last month of the summer, August, is also a moderately hot month in Hercules, California, with temperature in the range of an average low of 56.8°F (13.8°C) and an average high of 76.6°F (24.8°C). In August, the average high-temperature remains the same as in July - a still moderately hot 76.6°F (24.8°C). Weather in August »

The first month of the autumn, September, is still a warm month in Hercules, California, with temperature in the range of an average low of 56.7°F (13.7°C) and an average high of 77.5°F (25.3°C). With an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 56.7°F (13.7°C), September is the warmest month. Weather in September »

October, the same as September, in Hercules, California, is another pleasant autumn month, with average temperature varying between 54.7°F (12.6°C) and 71.4°F (21.9°C). In October, the average high-temperature slightly decreases, from a warm 77.5°F (25.3°C) in September, to an agreeable 71.4°F (21.9°C). Weather in October »

November, the last month of the autumn, in Hercules, is another comfortable month, with temperature in the range of an average low of 48.7°F (9.3°C) and an average high of 62.6°F (17°C). In November, the average high-temperature marginally drops, from a pleasant 71.4°F (21.9°C) in October, to an enjoyable 62.6°F (17°C). Weather in November »

December, the first month of the winter, in Hercules, is still a mild month, with average temperature fluctuating between 55.4°F (13°C) and 43.9°F (6.6°C). With an average high-temperature of 55.4°F (13°C) and an average low-temperature of 43.9°F (6.6°C), December is the coldest month. Weather in December »

How much does it rain in Hercules?

Throughout the year, in Hercules, California, there are 72.2 rainfall days, and 12.83" (326mm) of precipitation is accumulated.

What are the months with the lowest UV index in Hercules?

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Hercules.

What is the rainiest month in Hercules?

The month with the most rainfall in Hercules is February when the rain falls for 8.3 days and typically aggregates up to 2.76" (70mm) of precipitation.

What is the most humid month in Hercules?

March is the most humid month in Hercules, with an average relative humidity of 74%.

What month is the ocean coldest in Hercules?

With an average ocean temperature of 52.7°F (11.5°C), April is the month with the coldest seawater in Hercules.

When is the highest UV index in Hercules?

April through September, with an average maximum UV index of 5, are months with the highest UV index in Hercules, California.

When are the longest days in Hercules?

June has the longest days of the year in Hercules, California, with an average of 14.8h of daylight.

What is the driest month in Hercules?

July and August are months with the least rain in Hercules when the rain falls for 1.7 days and typically aggregates up to 0.04" (1mm) of rain.

What month has the most sunshine in Hercules?

The month with the most sunshine in Hercules is July, with an average of 11.9h of sunshine.

What is the warmest month in Hercules?

With an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 56.7°F (13.7°C), September is the warmest month in Hercules, California.

What is the least humid month in Hercules?

Months with the lowest humidity are September and October, with an average relative humidity of 63%.

What is the month with the warmest ocean in Hercules?

The month with the warmest seawater is September, with an average ocean temperature of 57°F (13.9°C).

What is the coldest month in Hercules?

With an average high-temperature of 55.4°F (13°C) and an average low-temperature of 43.9°F (6.6°C), December is the coldest month in Hercules, California.

What is the month with the shortest days in Hercules?

December has the shortest days of the year in Hercules, California, with an average of 9.6h of daylight.

What is the month with the least sunshine in Hercules?

With an average of 5.7h of sunshine, December has the least sunshine of the year in Hercules.
Average temperature - Hercules, CA
Average humidity - Hercules, CA
Average rainfall - Hercules, CA

The wettest month (with the highest rainfall) is February (2.76").
Driest months (with the lowest rainfall) are July and August (0.04").

Average rainfall days - Hercules, CA

The month with the highest number of rainy days is March (12.6 days).
The month with the lowest number of rainy days is August (1.1 days).

Average sea temperature - Hercules, CA

The best month for swimming (with the highest average sea temperature) is September (57°F).
The coldest month (with the lowest average sea temperature) is April (52.6°F).

Average daylight / Average sunshine - Hercules, CA

The month with the longest days is June (Average daylight: 14.8h).
The month with shortest days is December (Average daylight: 9.6h).

The month with most sunshine is July (Average sunshine: 11.9h).
The month with least sunshine is December (Average sunshine: 5.7h).

Average UV index - Hercules, CA

Months with the highest UV index are April, May, June, July, August and September (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 3).