San José weather in January
January in San José: warm, a little rain, with clean air — one of the best months to visit.
#2 of 12 months in San José · #41 of 897 destinations to visit in January · comfort 92/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on San José in January
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San José climate normals — January
| Daytime high | 25°C / 77°F | 🌤 warm |
|---|---|---|
| Nighttime low | 17°C / 62°F | |
| Rainfall | 41 mm / 1.6 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 15°C / 60°F | |
| Sunshine | 10.3 h/day | |
| Daylight | 11.6 h | |
| Wind | 12 km/h / 7 mph | |
| Air quality (US AQI) | 27 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San José in January — FAQ
- Is January a good time to visit San José?
- January in San José: warm, a little rain, with clean air — one of the best months to visit. It ranks #2 of 12 months for San José on SeasonMap's comfort score (92/100).
- What is the weather like in San José in January?
- In January, San José averages a daily high of 25.2°C and a low of 16.8°C, with about 41.1 mm of rain over roughly 10.2 rainy days.
- What is the air quality in San José in January?
- San José has a mean US Air Quality Index of about 27 in January.