Galveston weather in May 2026

Expect daytime maximum temperatures of 27°C in Galveston, Texas in May based on long-term weather averages. There are 9 hours of sunshine per day on average with typically 99 mm of rainfall in the month.

  • 27°C maximum daytime temperature in May in Galveston27
    27°C max day temperature
  • 9 hours of sunshine per day
  • 7 days with some rainfall in May in Galveston7
    7 days with some rainfall
  • 22°C minimum night-time temperature in May in Galveston22
    22°C min night temperature
  • 14 hours of daylight per day in May in Galveston14
    14 hours of daylight per day
  • Moderate heat & humidity in May in GalvestonM
    Moderate heat & humidity
  • 99 mm monthly rainfall in May in Galveston99
    99 mm of monthly rainfall
  • UV (maximum) index 10 (Very High) in May in Galveston10
    10 (Very High) UV index
  • 25°C sea temperature in May in Galveston25
    25°C sea temperature

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The May weather guide for Texas (Galveston) 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 Galveston in May?

Daytime temperatures usually reach 29°C in Galveston in May with moderate heat and humidity, falling to 19°C at night.

How sunny is it in Galveston in May?

There are normally 7 hours of bright sunshine each day in Galveston in May - that's 53% of daylight hours.

Does it rain in Galveston in May?

There are usually 9 days with some rain in Galveston in May and the average monthly rainfall is 114mm.

Galveston May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st May 2026 05:37 18:56
Saturday, 16th May 2026 05:26 19:05
Sunday, 31st May 2026 05:20 19:14

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