Click on a day for an hourly weather forecast
The weather in Galveston in September is very hot. The average temperatures are between 26°C and 29°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Galveston. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Galveston in September 2025.
If you’re planning to visit Galveston in the near future, we highly recommend that you review the 14 day weather forecast for Galveston before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 15° / 11° | 5 | 26 | 0 | 83 mm | Good | Galveston in January |
| February | 16° / 12° | 5 | 23 | 0 | 61 mm | Good | Galveston in February |
| March | 19° / 16° | 4 | 27 | 0 | 56 mm | Good | Galveston in March |
| April | 23° / 19° | 3 | 27 | 0 | 65 mm | Perfect | Galveston in April |
| May | 26° / 23° | 6 | 25 | 0 | 93 mm | Perfect | Galveston in May |
| June | 29° / 27° | 8 | 22 | 0 | 168 mm | Ok | Galveston in June |
| July | 30° / 27° | 12 | 19 | 0 | 204 mm | Ok | Galveston in July |
| August | 31° / 28° | 11 | 20 | 0 | 234 mm | Ok | Galveston in August |
| September | 29° / 26° | 12 | 18 | 0 | 281 mm | Ok | Galveston in September |
| October | 26° / 22° | 6 | 25 | 0 | 121 mm | Perfect | Galveston in October |
| November | 20° / 17° | 4 | 26 | 0 | 89 mm | Good | Galveston in November |
| December | 17° / 14° | 5 | 26 | 0 | 87 mm | Good | Galveston in December |