San Antonio weather in January
January in San Antonio: nice, a little rain, with clean air — a great time to visit.
#7 of 12 months in San Antonio · #188 of 604 destinations to visit in January · comfort 79/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
San Antonio climate normals — January
| Daytime high | 19°C / 66°F | 😎 nice |
|---|---|---|
| Nighttime low | 8°C / 46°F | |
| Feels like (high) | 17°C / 63°F | |
| Rainfall | 51 mm / 2 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 59% | 🍃 comfortable |
| Dew point | 4°C / 38°F | |
| Sunshine | 7.1 h/day | |
| Daylight | 10.5 h | |
| Wind | 17 km/h / 11 mph | |
| Snowfall | 0.1 cm / 0 in | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San Antonio in January — FAQ
- Is January a good time to visit San Antonio?
- January in San Antonio: nice, a little rain, with clean air — a great time to visit. It ranks #7 of 12 months for San Antonio on SeasonMap's comfort score (79/100).
- What is the weather like in San Antonio in January?
- In January, San Antonio averages a daily high of 18.8°C and a low of 8°C, with about 51.1 mm of rain over roughly 7.6 rainy days.
- What is the air quality in San Antonio in January?
- San Antonio has a mean US Air Quality Index of about 32 in January.