San Bernardino Weather in December

San Bernardino in December sees pleasant daytime temperatures of 19°C (66°F) and nighttime lows of 6°C (43°F). With the highest rainfall of the year it is wise to pack an umbrella and expect frequent showers.

Rainfall in San Bernardino in December

As the month with the highest rainfall, make sure to have an umbrella to manage the showers. Historically, December sees about 7 days of rain, with a monthly average of 86 mm (3.4 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in San Bernardino in December

Daytime temperatures in San Bernardino reach 19°C (66°F) in December, dropping to 6°C (43°F) at night. This month falls in the winter season. The difference between afternoon and evening temperatures is usually noticeable. With lows around 6°C (43°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep. This period usually represents the year's more moderate temperatures, but it's far from being chilly.

Sunshine in San Bernardino in December

Enjoy a sunny month with about 205 hours of sunshine, the clear skies make San Bernardino even more beautiful.

If you prefer dry days with pleasant temperatures, January, February, March, April, May, October and November typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.