Austin Weather in September
Thinking of visiting Austin in September? Expect very high temperatures reaching 33°C (91°F) during the day, dropping to 21°C (70°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in Austin in September
Records from the past 30 years suggest around 8 days of rain, with 106 mm (4.2 in) average for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Austin in September
In September, Austin gets very high temperatures, with highs of 33°C (91°F). Nights cool to around 21°C (70°F). If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. With overnight lows of 21°C (70°F), evenings stay pleasantly warm.
Sunshine in Austin in September
Enjoy a sunny month with about 234 hours of sunshine, the clear skies make Austin even more beautiful.
Wind Speed in Austin in September
Wind speeds average 3 m/s (6 knots) during September. At this speed, light breezes keep leaves and small twigs in gentle motion while the wind also provides natural cooling. Since this is an average, some days are more tranquil while others have more persistent light winds that are more noticeable.Our weather planner can help you find worldwide destinations with pleasant weather during this period. March, April and November typically offer the best weather for Austin.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Austin's climate page.
Austin Temperature in September
Min Temperature
21°C (70°F)
Max Temperature
33°C (91°F)
Chance of Rain
28%
Precipitation
106 mm (4.2 in)
Rainy days
8 days
Humidity
68%
Windspeed
3 m/s (6 knots)
Sunshine
234 hours
Percentage Sunshine
63%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Austin typically drop from around 34°C (93°F) at the start of September to approximately 31°C (88°F) by the end. Nights are warm, with lows typically ranging from 18°C (64°F) to 23°C (73°F).
Average temperatures in September
Historical weather for Austin in September
Browse day-by-day weather records for Austin spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Austin historical weather extremes in September
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Austin.
- Austin recorded its highest September temperature of 43°C (109°F) on September 5, 2000.
- Nighttime temperatures dropped to 8°C (46°F) on September 23, 1999, marking the coldest September night on record.
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
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What to Wear in Austin in September
Pack for serious heat in Austin in September. Prioritize clothing that breathes and doesn't cling or stick. Lightweight cotton, linen, and moisture-wicking fabrics are ideal. A wide hat provides welcome shade. Expect heavy rainfall, so bring good rain protection and waterproof bags. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Austin in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Austin's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Austin climate overview or explore weather in the United States of America.
