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Take precautions - Protection against sunburn is recommended. Note: The average daily UV index of 5 in October transform into the following instructions: A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person. UV indexIn Santa Monica, the average daily maximum UV index is 5. SunshineIn October, the average sunshine is 8.3h. DaylightIn October, the average length of the day is 11.3h. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8☏ (21☌).
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Note: For swimming, a surface water temperature of 66.2☏ (19☌) is not enjoyable for the majority. Ocean temperature August through October, with an average ocean temperature of 66.2☏ (19☌), are months with the warmest seawater in Santa Monica. In Santa Monica, during the entire year, the rain falls for 48.8 days and collects up to 7.52" (191mm) of precipitation. Rainfall In Santa Monica, during October, the rain falls for 3.5 days and regularly aggregates up to 0.2" (5mm) of precipitation. HumidityIn Santa Monica, the average relative humidity is 56%. In October, in Santa Monica, California, the average low-temperature is 61☏ (16.1☌). TemperatureIn Santa Monica, the average high-temperature in October is practically the same as in September - a still moderately hot 76.1☏ (24.5☌).
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October, like September, in Santa Monica, California, is a moderately hot autumn month, with average temperature fluctuating between 61☏ (16.1☌) and 76.1☏ (24.5☌).