San Diego weather in January
January in San Diego: nice, a little rain, with very humid — a good time to visit.
#11 of 12 months in San Diego · #315 of 604 destinations to visit in January · comfort 68/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
San Diego climate normals — January
| Daytime high | 17°C / 63°F | 😎 nice |
|---|---|---|
| Nighttime low | 9°C / 48°F | |
| Feels like (high) | 16°C / 61°F | |
| Rainfall | 63 mm / 2.5 in | 🌦 some rain |
| Rainy days | 7 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 9°C / 47°F | |
| Sunshine | 8.5 h/day | |
| Daylight | 10.3 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 56 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is San Diego?
Loading map…
San Diego in January — FAQ
- Is January a good time to visit San Diego?
- January in San Diego: nice, a little rain, with very humid — a good time to visit. It ranks #11 of 12 months for San Diego on SeasonMap's comfort score (68/100).
- What is the weather like in San Diego in January?
- In January, San Diego averages a daily high of 17.1°C and a low of 9°C, with about 63.3 mm of rain over roughly 7.4 rainy days.
- What is the air quality in San Diego in January?
- San Diego has a mean US Air Quality Index of about 56 in January.