San Diego Weather in December

Thinking of visiting San Diego in December? Expect pleasant temperatures reaching 19°C (66°F) during the day, dropping to 9°C (48°F) at night, and be prepared for the wettest month of the year.

Rainfall in San Diego in December

This month is known for heavy rainfall, so don't forget your umbrella to stay dry. Typically around 7 days of rainfall are expected, averaging 59 mm (2.3 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in San Diego in December

In December, San Diego gets pleasant temperatures, with highs of 19°C (66°F). Nights cool to around 9°C (48°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. With lows around 9°C (48°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep. While this is the time of year with slightly cooler averages, it remains comfortably warm.

Sunshine in San Diego in December

Expect sunny days throughout the month, with an estimated 231 hours of sunshine. This makes it a pleasant time to visit San Diego.

December in San Diego can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.