Climate Insights for Galveston

The climate in Galveston is warm and mild. The average annual temperature is 22°C and approximately 1460mm of precipitation falls per year. Galveston receives a notable amount of rainfall throughout the year, including during its driest month. Galveston is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, February, December, when temperatures can drop to 12°C.

Galveston sees moderate temperature variation throughout the year, ranging from 12°C to 30°C. The warmest month is August, when average highs reach 30°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 12°C and an average of 14°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows. The sharpest temperature change occurs between October and November, with a 5°C shift in average temperatures.

Galveston is a fairly wet location, receiving approximately 1460mm of precipitation annually, which averages out to around 122mm per month. The wettest month is September, averaging 193mm of rainfall. August and June also tend to see above-average precipitation. The driest month is February, with just 65mm. That's 128mm less than September, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Galveston is moderately windy, with an average annual wind speed of 27km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 29km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in September, with average winds dropping to 23km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 6km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 29km/h in winter, 28km/h in spring, 25km/h in summer, 25km/h in autumn.

It is currently spring in Galveston, which began on March 20, 2026. Galveston is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 30°C, while the coldest stretch bottoms out in January near 12°C. Summer is next, beginning on June 21, 2026 — 84 days from now.

The best time to visit Galveston is during March, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 77mm per month. By contrast, August can be uncomfortably hot with highs reaching 30°C, while January is the coldest period with lows dropping to 12°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Galveston based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.