Hottest (avg)
#10 / 12
San Diego in January
January weather, climate averages, and packing tips.
Avg High
Avg Low
Rain
Daylight 10h
What to expect
As winter continues, January brings, where conditions remain fairly consistent. Daytime highs average 18°C / 64°F, dropping to 9°C / 47°F at night.
You can expect a mix of sun and cloud, with about 7 days seeing some rain.
January in context
How it compares to the rest of the year in San Diego.
Wettest (avg)
#2 / 12
Daylight Hours
#11 / 12
Windiest (avg)
#9 / 12
Highest UV
#11 / 12
Most Humid
#9 / 12
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight
- 10.3 hours
- UV index (max)
- 5
- Typical sun hours
- 06:49 – 17:05
Rain & Snow
- Total
-
- Rainy days
- 7
- Cloud cover
- 46%
- Snowfall
-
Humidity & Wind
- Humidity (avg)
- 74%
- Wind (avg)
-
- Wind (max gusts)
-
Frequently asked questions
Is January a good time to visit San Diego?
Typical January days in San Diego reach highs of 18°C (64°F) with nights around 9°C (48°F). It usually feels mild by day and cool after dark. It is among the wetter months, so it is wise to have some indoor backup plans or flexible activities.
What are temperatures like in January?
Daytime temperatures in January typically peak near 18°C (64°F), while nights drop to around 9°C (48°F). Expect mild afternoons and cool evenings.
How much does it rain in January?
Rainfall in January averages 62 mm (2.4 in) across roughly 7 days. Overall it is a moderately wet time of year, so showers are usually brief rather than all-day downpours.
How many hours of daylight are there in January?
You can expect about 10 hours of daylight in January. Sunrise is typically around 06:49 and sunset near 17:05. Days are on the shorter side, so plan activities around limited daylight.
How strong is the sun in January?
UV levels are moderate (around 5); sunscreen and sunglasses are still a good idea.
Is it windy in January?
In January, average wind speeds are around 8 km/h (5 mph), with gusts on the windiest days reaching about 37 km/h (23 mph). On the ground, it is a gentle to moderate breeze is common, but stronger winds are not frequent.