Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall days in May
- Average sea temperature in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
May brings a slight rise in Galveston's average high-temperature, moving from a pleasant 73°F (22.8°C) in April to a warm 79.3°F (26.3°C). During May, Galveston perceives a slight decrease in temperature from daytime highs, settling at an average low of 73.8°F (23.2°C).Humidity
In May, the average relative humidity is 79%.Rainfall
In Galveston, during May, the rain falls for 11.3 days and regularly aggregates up to 1.85" (47mm) of precipitation. In Galveston, during the entire year, the rain falls for 161.9 days and collects up to 24.33" (618mm) of precipitation.Snowfall
March through December are months without snowfall.Ocean temperature
In May, the average ocean temperature is 77.5°F (25.3°C).Note: Ideal surface water temperatures for any water activity fall between 77°F (25°C) and 84.2°F (29°C), offering maximum enjoyment for lengthened periods.
Daylight
In May, the average length of the day is 13h and 38min.On the first day of May, sunrise is at 6:36 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 6:20 am and sunset at 8:13 pm CDT.
Sunshine
The average sunshine in May is 10.3h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 7 during May leads to these advisories:
Shield from overexposure. Defense against sun-related harm is required. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Take note! Sand and water reflections strengthen the Sun's UV exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in May?
What is the average humidity in May?
How much does it rain in May?
When it does not snow?
What is the ocean temperature in May?
How many hours of daylight does Galveston have in May?
When are sunrise and sunset in May?
How many hours of sunshine does Galveston have in May?
When is the highest UV index?
How high is the UV index in May?
Average temperature in May
Galveston, TX
- Average high temperature in May: 79.3°F
The warmest month (with the highest average high temperature) is August (87.4°F).
The month with the lowest average high temperature is January (59.7°F).
- Average low temperature in May: 73.8°F
The month with the highest average low temperature is August (81.9°F).
The coldest month (with the lowest average low temperature) is January (51.6°F).
Average pressure in May
Galveston, TX
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Galveston, TX
- Average wind speed in May: 12.1mph
The windiest month (with the highest average wind speed) is April (12.9mph).
The calmest month (with the lowest average wind speed) is August (9.4mph).
Average humidity in May
Galveston, TX
- Average humidity in May: 79%
The months with the highest relative humidity are February and March (81%).
The month with the lowest relative humidity is October (72%).
Average rainfall in May
Galveston, TX
- Average rainfall in May: 1.85"
The wettest month (with the highest rainfall) is September (4.29").
The driest months (with the least rainfall) are February and March (0.75").
Average rainfall days in May
Galveston, TX
- Average rainfall days in May: 11.3 days
The month with the highest number of rainy days is September (19.9 days).
The month with the least rainy days is January (10.1 days).
Average snowfall days in May
Galveston, TX
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average sea temperature in May
Galveston, TX
- Average sea temperature in May: 77.5°F
The best month for swimming (with the highest average sea temperature) is August (87.2°F).
The coldest month (with the lowest average sea temperature) is January (56.5°F).
Average daylight in May /
Average sunshine in May
Galveston, TX
- Average daylight in May: 13h and 4min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in May: 10h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in May
Galveston, TX
- Average sunshine days in May: 17.8 days
The month with the most sunshine days is January (18.2 days).
The month with the least sunshine days is August (8.3 days).
Average UV index in May
Galveston, TX
- Average UV index in May: 7
The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January and December (UV index 4).
Average cloud cover in May
Galveston, TX
- Average cloud cover in May: 30
The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are June, July, August and October (Cloud cover 26).
Average visibility in May
Galveston, TX
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Galveston, Texas, USA
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