San Francisco Weather in December

San Francisco in December sees moderate daytime temperatures of 14°C (57°F) and nighttime lows of 7°C (45°F). With the highest rainfall of the year it is wise to pack an umbrella and expect frequent showers.

Rainfall in San Francisco in December

The month brings the most rain, so be prepared with an umbrella for the occasional shower. You can typically expect 13 days of rain this month, averaging around 112 mm (4.4 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in San Francisco in December

Daytime highs in San Francisco in December reach 14°C (57°F), with nights around 7°C (45°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. At 7°C (45°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions. This period often claims the chilliest monthly averages of the year.

Sunshine in San Francisco in December

The area enjoys a moderate level of sunlight, with around 160 hours. It's a good balance between sunny and cloudy days.

Wind Speed in San Francisco in December

Average wind speeds reach 3 m/s (6 knots) in December, creating light breezes that feel pleasant throughout the day. Some days are calmer, while others bring slightly more active breezes.

Average water temperature in December

The water is 13°C (55°F) this month, cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July, August, September and October typically offer the best weather for San Francisco.