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Take precautions - Protection against sunburn is recommended. Note: In January, the average maximum UV index of 4 translate into the following recommendations: A UV Index reading of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV rays for ordinary individuals. UV indexMonths with the lowest UV index are January, February, November and December, with an average maximum UV index of 4.

SunshineIn Santa Monica, the average sunshine is 6.7h. DaylightIn January, the average length of the day is 10.2h. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8☏ (21☌). Note: For swimming, a surface water temperature of 59☏ (15☌) is not enjoyable for the majority. Ocean temperatureJanuary through May and December, with an average ocean temperature of 59☏ (15☌), are months with the coldest seawater in Santa Monica. Rain falls for 5.4 days and accumulates 1.54" (39mm) of precipitation. RainfallJanuary is the month with the most rainfall in Santa Monica. HumidityIn January, the average relative humidity in Santa Monica is 55%. The average low-temperature, in Santa Monica, California, is 51.4☏ (10.8☌). TemperatureIn January, the average high-temperature is relatively the same as in December - a still enjoyable 65.5☏ (18.6☌). January, like December, in Santa Monica, California, is another enjoyable winter month, with average temperature fluctuating between 51.4☏ (10.8☌) and 65.5☏ (18.6☌).