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May Weather in Galveston, United States

Last updated: June 24, 2025

In Galveston, United States, the average temperature in May is a pleasant 18°C (64°F). However, be prepared for some variability, as temperatures can swing from a chilly -2°C (29°F) to a warm 34°C (94°F). Expect around 152 mm (6.0 in) of precipitation spread over 16 days, contributing to an average humidity of 81%. Whether you're soaking up the sun or dodging a rain shower, this month offers a diverse climate experience!

May Temperature in Galveston

In May in Galveston, the average temperature is 18°C (64°F). Maximums can reach 34°C (94°F), while minimums can drop as low as -2°C (29°F). This climate offers a diverse range of experiences for travelers, so be sure to pack accordingly for fluctuating temperatures.

May Weather in Galveston: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Galveston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Galveston, May typically has an average temperature of 18°C (64°F), with highs reaching up to 34°C (94°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec293142516473767369574135
Data source: Temperature data for Galveston generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Galveston

In Galveston in May, the precipitation amount is 152 mm (6.0 in) distributed over 16 days.

May Precipitation Trends in Galveston

The chart displays monthly precipitation patterns in Galveston, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Galveston, May typically receives around 152 mm (6.0 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec76821049315210697101671057966
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Galveston

In Galveston in May, humidity is 81%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel both refreshing and slightly stifling at the same time.

May Average Humidity in Galveston

This chart illustrates the average monthly humidity levels in Galveston, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Galveston is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%86%87%81%82%81%79%78%81%89%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Galveston

In Galveston in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Galveston.

Maximum UV Index Levels in Galveston for May

The chart shows the monthly maximum UV Index (UVI) for Galveston in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Galveston typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098642
Data source: Galveston May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in Galveston Compares to Other Months

Weather in Galveston varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Galveston, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Galveston, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)76 mm (3.0 inches)85%moderate
February Weather0°C (32°F)82 mm (3.2 inches)85%moderate
March Weather5°C (42°F)104 mm (4.1 inches)86%high
April Weather11°C (51°F)93 mm (3.7 inches)87%very high
May Weather18°C (64°F)152 mm (6.0 inches)81%very high
June Weather23°C (73°F)105 mm (4.2 inches)82%extreme
July Weather24°C (76°F)97 mm (3.8 inches)81%very high
August Weather23°C (74°F)101 mm (4.0 inches)79%very high
September Weather21°C (69°F)67 mm (2.6 inches)78%very high
October Weather14°C (57°F)105 mm (4.1 inches)81%high
November Weather5°C (41°F)79 mm (3.1 inches)89%moderate
December Weather2°C (35°F)66 mm (2.6 inches)86%low

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