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.
Galveston Monthly Temperatures
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:
Daily Historical Temperatures
49-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in July
Historical Galveston Temperatures: 1976-2026
Browse day-by-day temperature records for Galveston spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Galveston vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Galveston vs World: Temperature Compared
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.
