San Diego Weather in January

The climate in San Diego during January can be summarized as mild and reasonably dry.

January is in the winter in San Diego and is typically the coldest month of the year. Daytime maximum temperatures average around a cool 19°C (66°F), whilst at night 6°C (43°F) is normal.

On average January is the 3rd driest month of the year in San Diego with around 32mm 1.2 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 4.8 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in San Diego in January 2024.