Galveston Weather in September
Galveston in September averages 31°C (88°F) during the day and 25°C (77°F) at night. This is the wettest month of the year.
Rainfall in Galveston in September
Prepare for the heaviest rain of the year this month, which often comes in heavy showers. A poncho is a smart choice to stay dry. The climate data from previous years indicates about 13 days of rain, averaging 158 mm (6.2 in) for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Galveston in September
In September, Galveston sees very high temperatures, with highs of 31°C (88°F). Nights drop to around 25°C (77°F). Mornings and evenings are often more comfortable than the peak afternoon hours. Nights are warm at 25°C (77°F). It's worth making sure your accommodation has decent ventilation or air conditioning.
Sunshine in Galveston in September
The days are predominantly sunny, with an estimated total of around 239 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.If you prefer enjoying temperate temperatures and rain-free days, March, April, May and November typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Galveston's climate page.
Galveston Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
31°C (88°F)
Chance of Rain
43%
Precipitation
158 mm (6.2 in)
Rainy days
13 days
Sunshine
239 hours
Percentage Sunshine
65%
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Galveston typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows typically ranging from 21°C (70°F) to 26°C (79°F).
Average temperatures in September
Historical weather for Galveston in September
Browse day-by-day weather records for Galveston spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Galveston historical weather extremes in September
Our historical data for Galveston spans 1997 to 2025, revealing these weather extremes.
- The hottest September day on record in Galveston reached 40°C (104°F) (September 5, 2000).
- On September 26, 2000, Galveston saw its coldest September day with temperatures maxing out at 21°C (70°F).
- Galveston registered its coldest September night on September 26, 2000, with temperatures dropping to 11°C (52°F).
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Galveston in September
Warm but pleasant conditions in Galveston in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Galveston in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Galveston's climate page.
See the full Galveston climate overview or explore weather in the United States of America.
