Galveston (TX) Temperature by Month

Galveston, Texas, United States of America has an average annual maximum temperature of 25°C (77°F), ranging from 16°C (61°F) in January to 33°C (91°F) in August. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

The climate in Galveston is known for significant temperature differences throughout the year. At night, this contrast is just as clear, with lows ranging from 27°C (81°F) in August to 9°C (48°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Galveston by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. August, the warmest month, sees 282 hours of sunshine.

The chart below shows the average temperature throughout the year:

Galveston's average annual maximum temperature is 25°C (77°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Chicago, USA averages 15°C (59°F) annually, known for extreme seasonal swings, from bitterly cold winters to warm summers.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Galveston this rarely lasts long on the ground.

For more on Galveston's weather, including monthly rainfall, sunshine hours, and humidity, visit our Galveston climate page.