Weather in San Diego County, United States in December

So you're interested in going to San Diego County, United States in December

December is a slightly cold and dry time for sunbathing in San Diego County. December is a little too cold to enjoy swimming in San Diego County for any length of time. Consider visiting San Diego County in the months of June, July, August, September, for the best beach weather. Also consider one of our other suggestions for December.

Temperature in San Diego County in December

The average maximum temperature in San Diego County in December is 18°. The average maximum temperature is 21° in the previous month and 19° in the next month.

The average temperature in San Diego County in December is 13°. The average temperature ranges is 16° in the previous month and 13° in the next month.

The average minimum temperature in San Diego County in December is . The minimum temperature is 11° in the previous month and in the next month.

Sunshine in San Diego County in December

The average day light hours per day in San Diego County in December are 10 and there are 7.2 hours of sunshine per day on average during December making it a quite sunny month with some cloud cover.

The ultraviolet index in San Diego County in December is typically 3.5 during December. An ultraviolet index reading of 3 to 5 indicates there is a moderate risk of harm from unprotected sun exposure. Keep out of the sun during the strongest hours around midday when unprotected skin risks burning in less than 30 minutes. For the sensitive wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days, and after swimming or sweating. Tanning for hours is possible with the right application of sun cream. Watch out for relections from water that may increase ultraviolet exposure.

Sea Temperature in San Diego County in December

The average sea water temperature in San Diego County in December is 19.6° which is comfortable for swimming though some may prefer warmer water.

Rainfall in San Diego County in December

The average total rainfall in San Diego County in December is 13.2cm and on average there are 9.4 rainy days in December making it a dry time to visit the beach.

Humidity in San Diego County in December

The maximum dew point (an indicator of humidity) in San Diego County in December is which is a bit dry for some. The dew point is 11° in the previous month and in the next month.

The average maximum relative humidity in San Diego County in December is typically 85.2%. The maximum relative humidity is 83.4% in the previous month and 81.6% in the next month.

The average relative humidity in San Diego County in December is typically 66.1%. The average relative humidity is 64.1% in the previous month and 61.8% in the next month.

Wind Speed in San Diego County in December

The average maximum wind speed in San Diego County in December is typically 18kmh. The average maximum wind speed is 18kmh in the previous month and 18kmh in the next month.

The average wind speed in San Diego County in December is typically 8kmh. The average wind speed is 7kmh in the previous month and 7kmh in the next month.

The average wind direction in San Diego County in December is from the East-Southeast.

Monthly Averages

Suggested Beaches in December

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