San Antonio weather in May 2026

Expect daytime maximum temperatures of 30°C in San Antonio, Texas in May and high heat and humidity based on long-term weather averages. There are 7 hours of sunshine per day on average with typically 94 mm of rainfall in the month.

  • 30°C maximum daytime temperature in May in San Antonio30
    30°C max day temperature
  • 7 hours of sunshine per day
  • 8 days with some rainfall in May in San Antonio8
    8 days with some rainfall
  • 19°C minimum night-time temperature in May in San Antonio19
    19°C min night temperature
  • 14 hours of daylight per day in May in San Antonio14
    14 hours of daylight per day
  • High heat & humidity in May in San AntonioH
    High heat & humidity
  • 94 mm monthly rainfall in May in San Antonio94
    94 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in May in San Antonio11
    11 (Extreme) UV index

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The May 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 hot is it in San Antonio in May?

Daytime temperatures usually reach 30°C in San Antonio in May with high heat and humidity, falling to 19°C at night.

How sunny is it in San Antonio in May?

There are normally 7 hours of bright sunshine each day in San Antonio in May - that's 52% of daylight hours.

Does it rain in San Antonio in May?

There are usually 8 days with some rain in San Antonio in May and the average monthly rainfall is 94mm.

San Antonio May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st May 2026 05:52 19:11
Saturday, 16th May 2026 05:41 19:20
Sunday, 31st May 2026 05:35 19:29

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