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The weather in Austin in September is hot. The average temperatures are between 22°C and 32°C.
You can expect about 3 to 8 days of rain in Austin 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 Austin in September 2025.
If you’re planning to visit Austin in the near future, we highly recommend that you review the 14 day weather forecast for Austin before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 15° / 6° | 3 | 27 | 0 | 39 mm | Good | Austin in January |
| February | 16° / 8° | 4 | 24 | 1 | 45 mm | Good | Austin in February |
| March | 21° / 11° | 4 | 27 | 0 | 59 mm | Good | Austin in March |
| April | 25° / 15° | 5 | 25 | 0 | 74 mm | Perfect | Austin in April |
| May | 29° / 19° | 7 | 24 | 0 | 135 mm | Ok | Austin in May |
| June | 32° / 22° | 6 | 24 | 0 | 106 mm | Good | Austin in June |
| July | 35° / 23° | 4 | 27 | 0 | 78 mm | Ok | Austin in July |
| August | 36° / 24° | 3 | 28 | 0 | 90 mm | Ok | Austin in August |
| September | 32° / 22° | 7 | 23 | 0 | 140 mm | Ok | Austin in September |
| October | 27° / 16° | 4 | 27 | 0 | 88 mm | Perfect | Austin in October |
| November | 20° / 11° | 3 | 27 | 0 | 55 mm | Good | Austin in November |
| December | 16° / 8° | 3 | 27 | 0 | 54 mm | Good | Austin in December |