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September Weather in Houston, United States

Last updated: June 24, 2025

The average temperature in Houston, United States during September hovers around 22°C (72°F), with a minimum dipping to 7°C (45°F) and a maximum soaring to 34°C (94°F). Expect 42 mm (1.6 in) of rain over 5 days, contributing to an average humidity of 68%. 🌦️

September Temperature in Houston

In September in Houston, the average temperature is 22°C (72°F). The maximum can reach 34°C (94°F) and the minimum can be as low as 7°C (45°F). This diverse temperature range makes it a great time for travelers to enjoy a mix of warm and cooler experiences.

September Weather in Houston: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Houston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Houston, September typically has an average temperature of 22°C (72°F), with highs reaching up to 34°C (94°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec343748556574787572584541
Data source: Temperature data for Houston generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Houston

In Houston in September, the precipitation amount is 42 mm (1.6 in) over a period of 5 days.

September Precipitation Trends in Houston

The chart displays monthly precipitation patterns in Houston, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Houston, September typically receives around 42 mm (1.6 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec73100138170188687597421176863
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Houston

In Houston in September humidity is 68%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, slightly stifling but still manageable for traveling, creating an atmosphere that encourages leisurely outdoor activities while prompting occasional breaks for refreshment.

September Average Humidity in Houston

This chart illustrates the average monthly humidity levels in Houston, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Houston is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%80%80%83%83%76%69%68%72%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Houston

In Houston in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Houston.

Maximum UV Index Levels in Houston for September

The chart shows the monthly maximum UV Index (UVI) for Houston in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Houston typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710111111109753
Data source: Houston September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Houston Compares to Other Months

Weather in Houston varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Houston, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Houston, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)73 mm (2.9 inches)83%moderate
February Weather3°C (38°F)100 mm (3.9 inches)81%high
March Weather9°C (48°F)138 mm (5.4 inches)80%high
April Weather13°C (55°F)170 mm (6.7 inches)80%very high
May Weather18°C (65°F)188 mm (7.4 inches)83%extreme
June Weather23°C (74°F)67 mm (2.7 inches)83%extreme
July Weather26°C (78°F)75 mm (2.9 inches)76%extreme
August Weather24°C (76°F)97 mm (3.8 inches)69%very high
September Weather22°C (72°F)42 mm (1.6 inches)68%very high
October Weather15°C (58°F)117 mm (4.6 inches)72%high
November Weather7°C (45°F)68 mm (2.7 inches)83%moderate
December Weather5°C (41°F)63 mm (2.5 inches)86%moderate

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