January weather forecastHercules, CA
January
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).Temperature
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. Hercules temperatures generally rest at a low of 43.9°F (6.6°C) during the January nights.Humidity
In January, the average relative humidity is 73%.Rainfall
In Hercules, in January, during 9.9 rainfall days, 2.24" (57mm) 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
In Hercules, California, the average seawater temperature in January is 53.1°F (11.7°C).Note: Diving into 53.1°F (11.7°C) is practical below 50°F (10°C), given you're wearing protective swim gear; without it, expect a quick onset of cold shock and a struggle to breathe. Merely touching waters at 55.4°F (13°C) feels ice-cold.
Daylight
In Hercules, the average length of the day in January is 9h and 53min.On the first day of January, sunrise is at 7:25 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 5:30 pm PST.
Sunshine
In Hercules, the average sunshine in January is 6h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: The UV index of 3 during January translates into the following guidance:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Hercules, CA
- Average high temperature in January: 56.3°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 January: 43.9°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 January
Hercules, CA
- Average pressure in January: 30.13"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 January
Hercules, CA
- Average wind speed in January: 5.2mph
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 January
Hercules, CA
- Average humidity in January: 73%
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 January
Hercules, CA
- Average rainfall in January: 2.24"
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 January
Hercules, CA
- Average rainfall days in January: 9.9 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 January
Hercules, CA
- Average sea temperature in January: 53°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 January /
Average sunshine in January
Hercules, CA
- Average daylight in January: 9h and 54min
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
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 January
Hercules, CA
- Average sunshine days in January: 20.5 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 in January
Hercules, CA
- Average UV index in January: 3
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 January
Hercules, CA
- Average cloud cover in January: 34
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 January
Hercules, CA
- Average visibility in January: 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).
