Austin weather in September 2025

Expect 90°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Austin in September. Check more long-term weather averages for Austin in September before you book your next holiday to Texas in 2025/2026.

  • 90°F maximum daytime temperature in September in Austin90
    90°F max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Austin8
    8 days with some rainfall
  • 68°F minimum night-time temperature in September in Austin68
    68°F min night temperature
  • 12 hours of daylight per day in September in Austin12
    12 hours of daylight per day
  • High heat & humidity in September in AustinH
    High heat & humidity
  • 3.5 inches monthly rainfall in September in Austin3.5
    3.5 inches of monthly rainfall
  • UV (maximum) index 9 (Very High) in September in Austin9
    9 (Very High) UV index

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The September weather guide for Texas (Austin) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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More about the USA

How hot is it in Austin in September?

Daytime temperatures usually reach 90°F in Austin in September with high heat and humidity, falling to 68°F at night.

How sunny is it in Austin in September?

There are normally 8 hours of bright sunshine each day in Austin in September - that's 63% of daylight hours.

Does it rain in Austin in September?

There are usually 8 days with some rain in Austin in September and the average monthly rainfall is 3.5 inches.

What is the chance of a hurricane in Austin in September?

On average less than 1 day in September in Austin is likely to be affected by the passage of one or more tropical storms.

Austin September sunrise & sunset times

Browse the sunrise and sunset times for Austin in September 2025. Select a month to view Austin sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:08 18:53
Monday, 15th September 2025 06:16 18:36
Tuesday, 30th September 2025 06:24 18:17

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