Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January's advent notes a subtle adjustment in average high-temperature to a still refreshing 55.9°F (13.3°C) from December. During January, nights cool slightly to an average low of 48.7°F (9.3°C).Humidity
In Pacifica, California, the average relative humidity in January is 74%.Rainfall
In January, the rain falls for 8.3 days. Throughout January, 1.18" (30mm) of precipitation is accumulated. In Pacifica, during the entire year, the rain falls for 77.3 days and collects up to 6.81" (173mm) of precipitation.Daylight
In Pacifica, California, the average length of the day in January is 9h and 55min.On the first day of January, sunrise is at 7:24 am and sunset at 5:02 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 5:32 pm PST.
Sunshine
The average sunshine in January is 5.9h.UV index
In Pacifica, the average daily maximum UV index in January is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: A maximum daily UV index of 4 during January morphs into the following directions:
Make use of precautions - Suggestions to resist sunburn are communicated. The Sun's radiation is especially intense around midday; try to stay in shade during this period. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average January temperature?
What is the average humidity in January?
How much does it rain in January?
How many hours of daylight does Pacifica have in January?
When are sunrise and sunset in January?
How many hours of sunshine does Pacifica have in January?
How high is the UV index in January?
Average temperature in January
Pacifica, CA
- Average high temperature in January: 55.9°F
The warmest month (with the highest average high temperature) is September (67.5°F).
The month with the lowest average high temperature is December (55.6°F).
- Average low temperature in January: 48.7°F
The month with the highest average low temperature is September (56.8°F).
The coldest months (with the lowest average low temperature) are January and February (48.7°F).
Average pressure in January
Pacifica, CA
- Average pressure in January: 30.13"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).
Average wind speed in January
Pacifica, CA
- Average wind speed in January: 7.4mph
The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest months (with the lowest average wind speed) are August and September (6.8mph).
Average humidity in January
Pacifica, CA
- Average humidity in January: 74%
The month with the highest relative humidity is August (82%).
The months with the lowest relative humidity are November and December (72%).
Average rainfall in January
Pacifica, CA
- Average rainfall in January: 1.18"
The wettest month (with the highest rainfall) is February (1.34").
The driest months (with the least rainfall) are June, July and September (0.12").
Average rainfall days in January
Pacifica, CA
- Average rainfall days in January: 8.3 days
The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is September (3.6 days).
Average daylight in January /
Average sunshine in January
Pacifica, CA
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January: 5h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in January
Pacifica, CA
- Average sunshine days in January: 21.6 days
The month with the most sunshine days is October (24.5 days).
The month with the least sunshine days is August (18.7 days).
Average UV index in January
Pacifica, CA
- Average UV index in January: 4
The months with the highest UV index are June, August and September (UV index 5).
The months with the lowest UV index are February and December (UV index 3).
Average cloud cover in January
Pacifica, CA
- Average cloud cover in January: 35
The month with the most cloud cover is March (Cloud cover 39).
The months with the least cloud cover are September and October (Cloud cover 21).
Average visibility in January
Pacifica, 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).
Pacifica, California, USA
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