San Francisco Weather in January

San Francisco in January averages 14°C (57°F) during the day and 7°C (45°F) at night. Keep in mind that quite a bit of rainfall is expected this month.

Rainfall in San Francisco in January

You can typically expect 9 days of rain this month, averaging around 70 mm (2.8 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in San Francisco in January

Temperatures in San Francisco in January top out at 14°C (57°F) and drop to 7°C (45°F) overnight. The difference between afternoon and evening temperatures is usually noticeable. With overnight lows of 7°C (45°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in San Francisco in January

The area experiences a moderate amount of sunshine, with approximately 186 hours of sunlight expected. This means a decent mix of sun and overcast.

Wind Speed in San Francisco in January

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

Average water temperature in January

With water temperatures around 12°C (54°F), swimming isn't really an option for most visitors. The cold sets in quickly and a wetsuit won't fully solve it.

If your ideal day consists of dry skies and pleasant temperatures, May, June, July, August, September and October typically offer the best circumstances for San Francisco.