What September feels like in Austin
Early autumn arrives in Austin with September. Expect proper heat in the afternoon — slow down between noon and four. After sunset it cools off noticeably — nights stay warm. Some humidity hangs in the air, noticeable when the sun is strong.
Rain in Austin in September
Expect a mix of dry and wet days, with rain about one day in 4. Rain tends to come in heavy bursts: about 10.8 mm (0.4 in) on an average rainy day. The yearly figure is similar, around 10.1 mm per wet day.
Daylight and sunshine in September
In mid-September, sunrise is at about 7:15 am and sunset at about 7:38 pm (local time) — 12 h 23 min of daylight. Compared with mid-August, the day has lost 53 min. The sun is out for roughly 83% of those daylight hours, so skies are mostly clear.
How September compares to the rest of the year
September is the 4th warmest month of the year in Austin. Compared with August, afternoons are 3.7°C (6.7°F) cooler, with 11 mm more rain. October is cooler again. The next month's average high: 27.6°C (81.7°F).
Who September suits
- Sightseeing: a good fit — comfortable enough to explore on foot all day.
- Parks & outdoor: less ideal — afternoons are too warm to linger outside.
Tips for visiting Austin in September
Rain Protection
A compact umbrella and a light waterproof jacket.
Sun Protection
Protect yourself from strong sun: hat, SPF and plenty of water.
Quick questions
How warm is Austin in September?
Expect around 32°C (89.6°F) in the afternoon and 22.3°C (72.1°F) at night, which most visitors would call hot.
Does it rain a lot in Austin in September?
It does: about 8 rainy days bring roughly 86 mm, so plan some indoor options.
What should I wear in Austin in September?
The numbers point to rain protection and sun protection. Evenings feel similar to the day, so the same clothes work from morning to night.
Is September or October better for visiting Austin?
On our 12-month climate ranking, October comes out ahead (#5 of 12 vs #6). October is cooler and has fewer rainy days.