Click on a day for an hourly weather forecast
The weather in Brownsville in September is very hot. The average temperatures are between 26°C and 33°C, drinking water regularly is advisable.
You can expect about 3 to 8 days of rain in Brownsville during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Brownsville in September 2025.
If you’re planning to visit Brownsville in the near future, we highly recommend that you review the 14 day weather forecast for Brownsville before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 21° / 14° | 4 | 27 | 0 | 54 mm | Good | Brownsville in January |
| February | 23° / 16° | 2 | 26 | 0 | 31 mm | Perfect | Brownsville in February |
| March | 26° / 19° | 2 | 29 | 0 | 28 mm | Perfect | Brownsville in March |
| April | 29° / 21° | 3 | 28 | 0 | 31 mm | Good | Brownsville in April |
| May | 31° / 24° | 3 | 28 | 0 | 53 mm | Good | Brownsville in May |
| June | 33° / 26° | 5 | 25 | 0 | 96 mm | Good | Brownsville in June |
| July | 34° / 26° | 3 | 28 | 0 | 72 mm | Ok | Brownsville in July |
| August | 35° / 27° | 3 | 28 | 0 | 40 mm | Ok | Brownsville in August |
| September | 33° / 26° | 6 | 24 | 0 | 119 mm | Good | Brownsville in September |
| October | 30° / 23° | 3 | 28 | 0 | 53 mm | Good | Brownsville in October |
| November | 25° / 19° | 2 | 28 | 0 | 40 mm | Perfect | Brownsville in November |
| December | 22° / 16° | 3 | 28 | 0 | 48 mm | Good | Brownsville in December |