Climate and monthly weather forecastHercules, CA
Climate and monthly weather forecast
Weather in January
January, the same as December, in Hercules, California, is another mild winter month, with an average temperature ranging between min 43.9°F (6.6°C) and max 56.3°F (13.5°C). The average high-temperature for January is a still moderate 56.3°F (13.5°C), closely aligning with the temperature of the preceding month. Weather in January »Weather in February
February, the last month of the winter in Hercules, is another mild month, with an average temperature varying between 44.2°F (6.8°C) and 58.8°F (14.9°C). Hercules, California, commences February with an average high-temperature of a still mild 58.8°F (14.9°C), maintaining a close resemblance to the previous month. Weather in February »Weather in March
The first month of the spring, March, is an enjoyable month in Hercules, California, with an average temperature fluctuating between 46°F (7.8°C) and 61°F (16.1°C). March's onset brings an average high-temperature of a comfortable 61°F (16.1°C), showing a minute difference from February's 58.8°F (14.9°C). Weather in March »Weather in April
April, like March, in Hercules, California, is another refreshing spring month, with an average temperature fluctuating between 65.7°F (18.7°C) and 47.8°F (8.8°C). The beginning of April records an average high-temperature of a still refreshing 65.7°F (18.7°C), marking a negligible difference from March's 61°F (16.1°C). Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Hercules, California, with an average temperature ranging between max 69.3°F (20.7°C) and min 50.5°F (10.3°C). Hercules transitions into May recording an average high-temperature of an agreeable 69.3°F (20.7°C), closely aligning with the preceding month's temperature. Weather in May »Weather in June
The first month of the summer, June, is a warm month in Hercules, California, with temperature in the range of an average low of 54.3°F (12.4°C) and an average high of 74.8°F (23.8°C). The coming of June brings a minor shift in Hercules's weather, with average high-temperatures adjusting from May's agreeable 69.3°F (20.7°C) to a moderately hot 74.8°F (23.8°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Hercules, California, with an average temperature varying between 76.6°F (24.8°C) and 55.4°F (13°C). July's beginning signals an average high-temperature of a still moderately hot 76.6°F (24.8°C), barely different from June's 74.8°F (23.8°C). Weather in July »Weather in August
August, the last month of the summer in Hercules, is another warm month, with an average temperature fluctuating between 76.6°F (24.8°C) and 56.8°F (13.8°C). The high-temperature during August, registering at a still warm 76.6°F (24.8°C), holds the same measure as the previous month. Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Hercules, California, with an average temperature ranging between max 77.5°F (25.3°C) and min 56.7°F (13.7°C). September stands out as Hercules's warmest month, with an average high-temperature of 77.5°F (25.3°C) and a low-temperature of 56.7°F (13.7°C). Weather in September »Weather in October
October, like September, is another pleasant autumn month in Hercules, California, with an average temperature fluctuating between 54.7°F (12.6°C) and 71.4°F (21.9°C). With the onset of October, Hercules's climate undergoes a slight change as the average high-temperature moves from a warm 77.5°F (25.3°C) in September to an agreeable 71.4°F (21.9°C). Weather in October »Weather in November
November, the last month of the autumn in Hercules, is another refreshing month, with temperature in the range of an average high of 62.6°F (17°C) and an average low of 48.7°F (9.3°C). As November arrives, Hercules's weather displays a minor decrease in high-temperatures, transitioning from October's agreeable 71.4°F (21.9°C) to a comfortable 62.6°F (17°C). Weather in November »Weather in December
The first month of the winter, December, is still a refreshing month in Hercules, California, with an average temperature fluctuating between 55.4°F (13°C) and 43.9°F (6.6°C). December, characterized by an average high temperature of 55.4°F (13°C) and a low temperature of 43.9°F (6.6°C), is generally the coldest month. Weather in December »Updated: Feb 9, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Throughout the year, there are 72.2 rainfall days, and 12.83" (326mm) of precipitation is accumulated.
The months with the lowest UV index in Hercules, California, are January, February, November and December, with an average maximum UV index of 3.
The month with the most rainfall is February, when the rain falls for 8.3 days and typically aggregates up to 2.76" (70mm) of precipitation.
The most humid month is March, with an average relative humidity of 74%.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Hercules, California, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
The month with the coldest seawater is April, with an average ocean temperature of 52.7°F (11.5°C).
The months with the highest UV index in Hercules, California, are April through September, with an average maximum UV index of 5.
With an average of 14h and 48min of daylight, June has the longest days of the year.
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.
The month with the most sunshine in Hercules is July, with an average of 11.9h of sunshine.
The warmest period is September, when temperatures fluctuate between an average high of 77.5°F (25.3°C) and a low of 56.7°F (13.7°C).
September and October, with an average relative humidity of 63%, are the least humid months in Hercules.
The month with the warmest seawater in Hercules, California, is September, with an average ocean temperature of 57°F (13.9°C).
Hercules's December weather, with an average high temperature of 55.4°F (13°C) and an average low temperature of 43.9°F (6.6°C), tends to be the coldest of the year.
The month with the shortest days is December, with an average of 9h and 36min of daylight.
With an average of 5.7h of sunshine, December has the least sunshine of the year.
Average temperature
Hercules, CA
The warmest month (with the highest average high temperature) is September (77.5°F).
The month with the lowest average high temperature is December (55.4°F).
The month with the highest average low temperature is August (56.8°F).
The coldest months (with the lowest average low temperature) are January and December (43.9°F).
Average pressure
Hercules, CA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
30.03"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed
Hercules, CA
- Average wind speed in January:
5.2mph - Average wind speed in February:
6mph - Average wind speed in March:
6.5mph - Average wind speed in April:
6.8mph - Average wind speed in May:
7.5mph - Average wind speed in June:
7.2mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.4mph - Average wind speed in September:
5.7mph - Average wind speed in October:
5.2mph - Average wind speed in November:
4.8mph - Average wind speed in December:
5.5mph
The windiest month (with the highest average wind speed) is May (7.5mph).
The calmest month (with the lowest average wind speed) is November (4.8mph).
Average humidity
Hercules, CA
The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are September and October (63%).
Average rainfall
Hercules, CA
- Average rainfall in January:
2.24" - Average rainfall in February:
2.76" - Average rainfall in March:
2.09" - Average rainfall in April:
0.71" - Average rainfall in May:
0.55" - Average rainfall in June:
0.16"
- Average rainfall in July:
0.04" - Average rainfall in August:
0.04" - Average rainfall in September:
0.12" - Average rainfall in October:
0.59" - Average rainfall in November:
1.42" - Average rainfall in December:
2.13"
The wettest month (with the highest rainfall) is February (2.76").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days
Hercules, CA
- Average rainfall days in January:
9.9 days - Average rainfall days in February:
8.3 days - Average rainfall days in March:
12.6 days - Average rainfall days in April:
7.3 days - Average rainfall days in May:
4.3 days - Average rainfall days in June:
2 days
- Average rainfall days in July:
1.7 days - Average rainfall days in August:
1.1 days - Average rainfall days in September:
2.3 days - Average rainfall days in October:
5.1 days - Average rainfall days in November:
7.2 days - Average rainfall days in December:
10.4 days
The month with the highest number of rainy days is March (12.6 days).
The month with the least 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
- Average daylight in January:
9h and 54min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 12min - Average daylight in June:
14h and 48min
- Average daylight in July:
14h and 30min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 6min - Average daylight in December:
9h and 36min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
6h and 0min - Average sunshine in February:
6h and 12min - Average sunshine in March:
7h and 42min - Average sunshine in April:
10h and 18min - Average sunshine in May:
10h and 36min - Average sunshine in June:
11h and 36min
- Average sunshine in July:
11h and 54min - Average sunshine in August:
11h and 42min - Average sunshine in September:
10h and 54min - Average sunshine in October:
7h and 0min - Average sunshine in November:
6h and 30min - Average sunshine in December:
5h and 42min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days
Hercules, CA
- Average sunshine days in January:
20.5 days - Average sunshine days in February:
19 days - Average sunshine days in March:
16.4 days - Average sunshine days in April:
21.6 days - Average sunshine days in May:
24.3 days - Average sunshine days in June:
25.8 days
- Average sunshine days in July:
26.8 days - Average sunshine days in August:
27.3 days - Average sunshine days in September:
25.9 days - Average sunshine days in October:
24.4 days - Average sunshine days in November:
21.6 days - Average sunshine days in December:
19.5 days
The month with the most sunshine days is August (27.3 days).
The month with the least sunshine days is March (16.4 days).
Average UV index
Hercules, CA
The months with the highest UV index are April, May, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover
Hercules, CA
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 12).
Average visibility
Hercules, CA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
