Weather in San Diego in January 2025
- January is usually the coldest month of the year in San Diego;
Average weather
Average temperature in San Diego in January
The temperature in January is +17°C on average, with a range between a maximum of +22°C during the day and a minimum of +5°C at night.
The average maximum temperature goes up 6% by the end of the month, compared with the beginning of the month, from +15°C to +16°C.
Is San Diego warm or cold in January?
San Diego is typically mild in January.
Maximum temperatures go up compared to the previous month from +18°C to +18°C. The minimum temperature also goes up from +10°C to +10°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
January is the coldest month in San Diego, here is the comparison with other months:
Water temperature in San Diego in January
Water in San Diego in January is Cold. It varies from +14°C to +16°C, with an average of +15°C. This is almost similar to the air temperature, which averages +18°C.
The water temperature in January is one of the coldest of the entire year:
Can you swim in San Diego in January?
Climate in San Diego in January
| December | January | February | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +18°C | +18°C | +18°C | ||||
| Min. temperature | ||||||
| +3°C | +3°C | +3°C | ||||
| Max. temperature | ||||||
| +27°C | +30°C | +30°C | ||||
| Rainfall | ||||||
| 53 mm | 69 mm | 84 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Avg. water temperature | ||||||
| +16°C | +15°C | +15°C | ||||
| Humidity | ||||||
| 67% | 68% | 68% | ||||
| Air pressure | ||||||
| 1017 HPa | 1018 HPa | 1017 HPa | ||||
| Sunny days | ||||||
| 10 | 8 | 7 | ||||
| Cloudy days | ||||||
| 12 | 13 | 11 | ||||
| Rainy days | ||||||
| 9 | 10 | 10 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
January weather is still as good as in December. The temperature levels stay the same in the area of +18°C for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 53 mm to 69 mm. Humidity rises from 67% to 68%. The average wind speed doesn’t change much during January, staying around 2 m/s. The days becoming less sunny, going from 10 sunny days in December to 8 in January.
February brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in San Diego is gradually decreasing during January, going from 8 m/s to 3 m/s over the course of the month.
Rain
How was the weather last January in San Diego?
Climate Change over Years
The climate in San Diego in January has not changed much over the last 43 years.
The average temperature was the lowest in 2001 (+19°C) and the highest in 2014 (+23°C). The driest year was 2002 with only 156 mm of rainfall, and the wettest year was 2023 with 1311 mm.
FAQ
Is January a good time to visit San Diego?
Can you sunbathe in San Diego in January?
Can you swim in San Diego in January?
Is San Diego rainy in January?
Is it sunny in San Diego in January?
Other cities in USA
Monthly weather in San Diego
Source of the data
For this page, we’ve looked at the typical weather in San Diego, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.