San Antonio weather in January 2026

Expect daytime maximum temperatures of 16°C in San Antonio, Texas in January based on long-term weather averages. There are 5 hours of sunshine per day on average.

  • 16°C maximum daytime temperature in January in San Antonio16
    16°C max day temperature
  • 5 hours of sunshine per day
  • 7 days with some rainfall in January in San Antonio7
    7 days with some rainfall
  • 3°C minimum night-time temperature in January in San Antonio3
    3°C min night temperature
  • 11 hours of daylight per day in January in San Antonio11
    11 hours of daylight per day
  • No heat & humidity in January in San Antonio0
    No heat & humidity
  • 38 mm monthly rainfall in January in San Antonio38
    38 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in January in San Antonio4
    4 (Moderate) UV index

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The January weather guide for Texas (San Antonio) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How warm is it in San Antonio in January?

Daytime temperatures usually reach 16°C in San Antonio in January, falling to 3°C at night.

How sunny is it in San Antonio in January?

There are normally 5 hours of bright sunshine each day in San Antonio in January - that's 49% of daylight hours.

Does it rain in San Antonio in January?

There are usually 7 days with some rain in San Antonio in January and the average monthly rainfall is 38mm.

San Antonio January sunrise & sunset times

Browse the sunrise and sunset times for San Antonio in January 2026. Select a month to view San Antonio sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 07:29 17:47
Friday, 16th January 2026 07:29 17:59
Saturday, 31st January 2026 07:24 18:11

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