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September Weather in Willis, United States

Last updated: June 24, 2025

In Willis, United States, the average temperature in September hovers around 26°C (80°F), making it a delightful time to explore. During this month, temperatures can range from a cool 12°C (54°F) to a sizzling 38°C (101°F). Expect to encounter 139 mm (5.5 in) of precipitation over approximately 14 days, contributing to an average humidity of 69%. Enjoy the vibrant weather while staying prepared for the occasional shower!

September Temperature in Willis

In September in Willis, the average temperature is 26°C (80°F), with maximums reaching 38°C (101°F) and minimums dipping as low as 12°C (54°F). Travelers should be prepared for warm days but also cool evenings.

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

The chart illustrates September temperature patterns in Willis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Willis, September typically has an average temperature of 26°C (80°F), with highs reaching up to 38°C (101°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec525564687681838479716056
Data source: Temperature data for Willis 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 Willis

In Willis, in September, the precipitation amount is 139 mm (5.5 in) over the course of 14 days.

September Precipitation Trends in Willis

The chart displays monthly precipitation patterns in Willis, 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 Willis, September typically receives around 139 mm (5.5 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec891098410319914610715313910779119
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Willis

In Willis in September, humidity is 69%. With an average temperature of 26°C (80°F), this humidity feels like a warm, steamy embrace, making outdoor activities slightly sweaty and requiring frequent breaks for hydration but still inviting for leisurely strolls or exploring local attractions.

September Average Humidity in Willis

This chart illustrates the average monthly humidity levels in Willis, 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 Willis 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 Willis

In Willis in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Willis.

Maximum UV Index Levels in Willis for September

The chart shows the monthly maximum UV Index (UVI) for Willis 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 Willis typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111111121110865
Data source: Willis 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 Willis Compares to Other Months

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

This table compares monthly weather conditions in Willis, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (53°F)89 mm (3.5 inches)79%moderate
February Weather13°C (55°F)109 mm (4.3 inches)80%very high
March Weather18°C (64°F)84 mm (3.3 inches)78%very high
April Weather20°C (68°F)103 mm (4.1 inches)79%extreme
May Weather24°C (76°F)199 mm (7.8 inches)81%extreme
June Weather27°C (82°F)146 mm (5.7 inches)77%extreme
July Weather29°C (84°F)107 mm (4.2 inches)71%extreme
August Weather29°C (84°F)153 mm (6.0 inches)67%extreme
September Weather26°C (80°F)139 mm (5.5 inches)69%very high
October Weather21°C (71°F)107 mm (4.2 inches)73%very high
November Weather16°C (60°F)79 mm (3.1 inches)82%high
December Weather13°C (56°F)119 mm (4.7 inches)87%moderate

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