January weather forecast
California, USA

January is often the coldest month of the year in California, marking the peak of the winter season. In coastal areas, such as Los Angeles and San Francisco, temperatures range from 40°F (4.4°C) to 50°F (10°C). The weather is relatively warmer compared to the inland and mountainous regions but is still cooler compared to December.

Northern parts of California, particularly in highland and mountainous regions, experience substantial cold. In areas like Mammoth Lakes in the Sierra Nevada mountains, temperatures can plummet to an average low of 15°F (-9.4°C), making it one of the coldest spots in the state. Snowfall is common in these regions and can be heavy, often exceeding the amounts seen in December.

In contrast, Death Valley, located in the eastern desert region, remains relatively warm even in January. However, nights can still be chilly, reflecting the general cooling trend seen across the state at this time of year.

January is also a month when rainfall is prevalent, especially in the northern parts of the state. It may be considered one of the rainiest months, particularly in regions lying west of the mountain ranges, as these areas receive more rain than the eastern parts that lie in the rain shadow region.

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• Los Angeles - January »
  January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Los Angeles, California. On the first day of January in Los Angeles, sunrise is at 6:58 am and sunset at 4:54 pm.
• San Francisco - January »
  In San Francisco in January, during 8.2 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in San Francisco.
• San Diego - January »
  San Diego's weather, upon January's arrival, documents an average high-temperature of a still comfortable 64.2°F (17.9°C), nearly identical to the prior month. On the first day of January in San Diego, sunrise is at 6:50 am and sunset at 4:53 pm.
• San Jose - January »
  In San Jose, in January, during 6.3 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. In January, San Jose experiences a minor shift in meteorological conditions with average high-temperatures marked at a still refreshing 58.1°F (14.5°C), closely mirroring the climate in December.
• Sacramento - January »
  The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3. In Sacramento, California, in January, it is raining for 8.4 days, with typically 1.1" (28mm) of accumulated precipitation.
• Fresno - January »
  In Fresno, California, during January, the rain falls for 6.8 days and regularly aggregates up to 1.42" (36mm) of precipitation. On the first day of January in Fresno sunrise is at 7:11 am and sunset at 4:53 pm.
• Long Beach - January »
  The months with the lowest UV index in Long Beach are January, February, November and December, with an average maximum UV index of 4. January, February and December, with an average of 6.8h of sunshine, are months with the least sunshine in Long Beach.
• Oakland - January »
  The months with the lowest UV index in Oakland are January, February, November and December, with an average maximum UV index of 3. In Oakland, during January, the rain falls for 6.2 days and regularly aggregates up to 0.47" (12mm) of precipitation.
• Bakersfield - January »
  In Bakersfield, California, snow does not fall in January, March through December. The months with the lowest UV index in Bakersfield, California, are January, November and December, with an average maximum UV index of 3.
• Anaheim - January »
  In Anaheim, in January, during 4.8 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. In Anaheim, in January, during 4.8 rainfall days, 1.14" (29mm) of precipitation is typically accumulated.
• Santa Ana - January »
  Weather in Santa Ana in January, experiences mild temperatures with the high and low temperature averaging between 65.8°F (18.8°C) and 51.3°F (10.7°C). On the last day of January, in Santa Ana, sunrise is at 6:48 am and sunset at 5:21 pm PST.
• Riverside - January »
  In Riverside, California, during January, the rain falls for 5.2 days and regularly aggregates up to 1.1" (28mm) of precipitation. In Riverside, snow does not fall in January, March through December.