nomadseason

September Weather in Brenham, United States

Last updated: June 24, 2025

In Brenham, United States, the average temperature in September is a pleasant 27°C (81°F). However, be prepared for a range, as it can dip to a minimum of 11°C (53°F) and soar up to a sizzling 38°C (101°F). Expect around 125 mm (4.9 in) of precipitation spread over 12 days, with an average humidity of 69%. Whether you're enjoying the sunshine or dodging the rain, pack accordingly!

September Temperature in Brenham

In September in Brenham, the average temperature is 27°C (81°F). Maximum temperatures can reach as high as 38°C (101°F), while minimums can drop to as low as 11°C (53°F). Be prepared for warm days and cooler nights when traveling during this time.

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

The chart illustrates September temperature patterns in Brenham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brenham, September typically has an average temperature of 27°C (81°F), with highs reaching up to 38°C (101°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec535564697782848681726156
Data source: Temperature data for Brenham generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Brenham

In Brenham in September, the total precipitation amount is 125 mm (4.9 in) spread over 12 days.

September Precipitation Trends in Brenham

The chart displays monthly precipitation patterns in Brenham, 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 Brenham, September typically receives around 125 mm (4.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec708170111166118961201259572103
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Brenham

In Brenham in September, humidity is 69%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket wrapped around you, making it essential to stay hydrated and take frequent breaks during your travels.

September Average Humidity in Brenham

This chart illustrates the average monthly humidity levels in Brenham, 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 Brenham is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%80%78%79%81%77%71%67%69%73%82%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Brenham

In Brenham in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Brenham.

Maximum UV Index Levels in Brenham for September

The chart shows the monthly maximum UV Index (UVI) for Brenham 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 Brenham typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112121111865
Data source: Brenham 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 Brenham Compares to Other Months

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

This table compares monthly weather conditions in Brenham, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (53°F)70 mm (2.8 inches)79%moderate
February Weather13°C (55°F)81 mm (3.2 inches)80%very high
March Weather18°C (65°F)69 mm (2.7 inches)78%very high
April Weather20°C (69°F)111 mm (4.4 inches)79%extreme
May Weather25°C (77°F)166 mm (6.5 inches)81%extreme
June Weather28°C (83°F)118 mm (4.7 inches)77%extreme
July Weather29°C (85°F)96 mm (3.8 inches)71%extreme
August Weather30°C (86°F)120 mm (4.7 inches)67%extreme
September Weather27°C (81°F)125 mm (4.9 inches)69%extreme
October Weather22°C (72°F)95 mm (3.7 inches)73%very high
November Weather16°C (61°F)72 mm (2.8 inches)82%high
December Weather13°C (56°F)103 mm (4.0 inches)87%moderate

Compare Brenham's Climate with Cities Worldwide