April weather forecastHercules, CA
April
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).Temperature
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). Hercules observes an average nighttime temperature of 47.8°F (8.8°C) during April.Humidity
In Hercules, the average relative humidity in April is 70%.Rainfall
In Hercules, in April, during 7.3 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. In Hercules, during the entire year, the rain falls for 72.2 days and collects up to 12.83" (326mm) of precipitation.Ocean temperature
With an average ocean temperature of 52.7°F (11.5°C), April is the month with the coldest seawater in Hercules, California.Note: Swimming in 52.7°F (11.5°C) is deemed hazardous. Exposure to temperatures below 50°F (10°C) leads to immediate severe cold shock and hyperventilation.
Daylight
The average length of the day in April is 13h and 13min.On the first day of April in Hercules, sunrise is at 6:52 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:12 am and sunset at 7:59 pm PDT.
Sunshine
In Hercules, the average sunshine in April is 10.3h.UV index
The months with the highest UV index are April through September, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: During April, 5 as the daily maximum UV index converts into the following advice:
Guard yourself - Precautionary measures against sun damage are advocated. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Hercules, CA
- Average high temperature in April: 65.7°F
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).
- Average low temperature in April: 47.8°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 in April
Hercules, CA
- Average pressure in April: 30.03"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 in April
Hercules, CA
- Average wind speed in April: 6.8mph
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 in April
Hercules, CA
- Average humidity in April: 70%
The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are September and October (63%).
Average rainfall in April
Hercules, CA
- Average rainfall in April: 0.71"
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 in April
Hercules, CA
- Average rainfall days in April: 7.3 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 in April
Hercules, CA
- Average sea temperature in April: 52.6°F
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 in April /
Average sunshine in April
Hercules, CA
- Average daylight in April: 13h and 12min
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 April: 10h and 18min
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 in April
Hercules, CA
- Average sunshine days in April: 21.6 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 in April
Hercules, CA
- Average UV index in April: 5
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 in April
Hercules, CA
- Average cloud cover in April: 28
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 in April
Hercules, CA
- Average visibility in April: 6mi
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).
