Houston weather in September 2025

Expect 30°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Houston in September. Check more long-term weather averages for Houston in September before you book your next holiday to Texas in 2025/2026.

  • 30°C maximum daytime temperature in September in Houston30
    30°C max day temperature
  • 8 hours of sunshine per day
  • 9 days with some rainfall in September in Houston9
    9 days with some rainfall
  • 21°C minimum night-time temperature in September in Houston21
    21°C min night temperature
  • 12 hours of daylight per day in September in Houston12
    12 hours of daylight per day
  • High heat & humidity in September in HoustonH
    High heat & humidity
  • 123 mm monthly rainfall in September in Houston123
    123 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in September in Houston9
    9 (Very High) UV index

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The September weather guide for Texas (Houston) 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 / mm)  |  Imperial (°F / inches)

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More about the USA

How hot is it in Houston in September?

Daytime temperatures usually reach 30°C in Houston in September with high heat and humidity, falling to 21°C at night.

How sunny is it in Houston in September?

There are normally 8 hours of bright sunshine each day in Houston in September - that's 64% of daylight hours.

Does it rain in Houston in September?

There are usually 9 days with some rain in Houston in September and the average monthly rainfall is 123mm.

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

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

Houston September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:59 18:43
Monday, 15th September 2025 06:06 18:26
Tuesday, 30th September 2025 06:14 18:08

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