Click on a day for an hourly weather forecast
The weather in Houston in September is very hot. The average temperatures are between 24°C and 31°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Houston. 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 Houston in September 2025.
If you’re planning to visit Houston in the near future, we highly recommend that you review the 14 day weather forecast for Houston before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 16° / 9° | 6 | 25 | 0 | 111 mm | Good | Houston in January |
| February | 18° / 11° | 6 | 22 | 0 | 106 mm | Good | Houston in February |
| March | 22° / 14° | 6 | 25 | 0 | 108 mm | Good | Houston in March |
| April | 26° / 17° | 6 | 24 | 0 | 123 mm | Perfect | Houston in April |
| May | 29° / 21° | 9 | 23 | 0 | 191 mm | Ok | Houston in May |
| June | 32° / 25° | 10 | 20 | 0 | 229 mm | Ok | Houston in June |
| July | 33° / 25° | 12 | 19 | 0 | 248 mm | Ok | Houston in July |
| August | 34° / 26° | 12 | 19 | 0 | 303 mm | Bad | Houston in August |
| September | 31° / 24° | 12 | 18 | 0 | 312 mm | Ok | Houston in September |
| October | 28° / 19° | 7 | 24 | 0 | 180 mm | Good | Houston in October |
| November | 21° / 14° | 5 | 25 | 0 | 124 mm | Good | Houston in November |
| December | 18° / 11° | 6 | 24 | 0 | 127 mm | Good | Houston in December |