Weather in San Antonio in January
January in San Antonio is cool with average temperatures around 10.8°C (51.4°F). Light rainfall with only 49mm expected.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
17.0°C
62.6°F
Low
4.5°C
40.1°F
Precipitation
49 mm
1.9 inches
~6 rainy days
Conditions
Humidity
70%
Comparison to Adjacent Months
January is 2.2°C cooler than February.