January weather forecastCosta Mesa, CA
January
Weather in January
January, like December, in Costa Mesa, California, is another comfortable winter month, with temperature in the range of an average low of 53.6°F (12°C) and an average high of 64.4°F (18°C).Temperature
Costa Mesa starts January with an average high-temperature of a still comfortable 64.4°F (18°C), hinting at a minimal fluctuation from December. Costa Mesa's average low-temperature during January nights is observed to be a fresh 53.6°F (12°C).Humidity
The average relative humidity in January is 60%.Rainfall
In January, in Costa Mesa, the rain falls for 4.2 days. Throughout January, 0.39" (10mm) of precipitation is accumulated. Throughout the year, in Costa Mesa, there are 50.7 rainfall days, and 3.74" (95mm) of precipitation is accumulated.Daylight
In Costa Mesa, the average length of the day in January is 10h and 13min.On the first day of January in Costa Mesa, California, sunrise is at 6:56 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 5:21 pm PST.
Sunshine
In Costa Mesa, the average sunshine in January is 6.7h.UV index
January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 4 in January converts into the following recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Costa Mesa, CA
- Average high temperature in January: 64.4°F
The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (62.4°F).
- Average low temperature in January: 53.6°F
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (52.3°F).
Average pressure in January
Costa Mesa, CA
- Average pressure in January: 30.1"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.89"Hg).
Average wind speed in January
Costa Mesa, CA
- Average wind speed in January: 5.5mph
The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is October (5.2mph).
Average humidity in January
Costa Mesa, CA
- Average humidity in January: 60%
The month with the highest relative humidity is June (74%).
The month with the lowest relative humidity is November (59%).
Average rainfall in January
Costa Mesa, CA
- Average rainfall in January: 0.39"
The wettest month (with the highest rainfall) is December (0.79").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in January
Costa Mesa, CA
- Average rainfall days in January: 4.2 days
The month with the highest number of rainy days is March (6.6 days).
The month with the least rainy days is June (1.6 days).
Average daylight in January /
Average sunshine in January
Costa Mesa, CA
- Average daylight in January: 10h and 12min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in January: 6h and 42min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in January
Costa Mesa, CA
- Average sunshine days in January: 25.8 days
The month with the most sunshine days is June (26.5 days).
The month with the least sunshine days is February (20.5 days).
Average UV index in January
Costa Mesa, CA
- Average UV index in January: 4
The months with the highest UV index are July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in January
Costa Mesa, CA
- Average cloud cover in January: 22
The months with the most cloud cover are March and December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility in January
Costa Mesa, 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).
