January Weather in San Antonio

Last updated: March 2, 2024

The weather in San Antonio, United States, during January is characterized by an average temperature of 16°C (60°F). Highs can soar to 28°C (83°F), while lows may dip to 0°C (32°F). Typically, the humidity level in San Antonio throughout January hovers around 83%.

0°C (32°F)

Minimum temperature

16°C (60°F)

Average temperature

28°C (83°F)

Maximum temperature

83%

Humidity

Precipitation and Sunshine hours

In January, San Antonio averages 43 mm (1.7 inches) of rainfall, typically over the course of 4 rainy days. The month enjoys an average of 10 hours 34 minutes of daylight, with the sun shining for approximately 6 hours 58 minutes each day. Additionally, there is a 39% probability of sunny days during this period.

43 mm (1.7 inches)

Precipitation

4 rainy days

Rainy days

6 hours 58 minutes

Sunshine hours

39%

Chance of sun

UV Index

In January, the UV Index in San Antonio reaches a maximum of 6, indicating a level of High exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 25 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 0 1 1 3 4 5 6 5 3 2 1 0 0
Exposure Low Moderate High Moderate Low
Time to burn 45 min 30 min 25 min 30 min 45 min

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