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September Weather in Keller, United States

Last updated: June 24, 2025

In Keller, United States, the average temperature in September reaches a pleasant 26°C (79°F). However, be prepared for fluctuations, as temperatures can dip to a minimum of 10°C (51°F) and soar to a maximum of 38°C (101°F). During this month, you can expect about 79 mm (3.1 in) of precipitation over approximately 8 days, all while enjoying an average humidity of 65%. Make sure to pack accordingly!

September Temperature in Keller

In September in Keller, the average temperature is 26°C (79°F), with maximums reaching 38°C (101°F) and minimums dropping to as low as 10°C (51°F). This diverse temperature range makes Keller a perfect destination for those who enjoy a variety of weather experiences while traveling.

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

The chart illustrates September temperature patterns in Keller, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Keller, September typically has an average temperature of 26°C (79°F), with highs reaching up to 38°C (101°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec464960657481858579675651
Data source: Temperature data for Keller 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 Keller

In Keller in September, the precipitation amount is 79 mm (3.1 in) during 8 days, indicating a relatively wet period for the area.

September Precipitation Trends in Keller

The chart displays monthly precipitation patterns in Keller, 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 Keller, September typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec5289100104150884087791335452
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Keller

In Keller in September, humidity is 65%. With an average temperature of 26°C (79°F), this humidity feels like a warm, enveloping blanket, making travel quite sticky and uncomfortable.

September Average Humidity in Keller

This chart illustrates the average monthly humidity levels in Keller, 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 Keller is approximately 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Keller

In Keller 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 Keller.

Maximum UV Index Levels in Keller for September

The chart shows the monthly maximum UV Index (UVI) for Keller 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 Keller typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
Data source: Keller 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 Keller Compares to Other Months

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

This table compares monthly weather conditions in Keller, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)52 mm (2.0 inches)80%moderate
February Weather9°C (49°F)89 mm (3.5 inches)79%high
March Weather16°C (60°F)100 mm (3.9 inches)78%very high
April Weather18°C (65°F)104 mm (4.1 inches)78%very high
May Weather24°C (75°F)150 mm (5.9 inches)81%extreme
June Weather27°C (82°F)88 mm (3.5 inches)78%extreme
July Weather30°C (85°F)40 mm (1.6 inches)73%extreme
August Weather29°C (85°F)87 mm (3.4 inches)66%extreme
September Weather26°C (79°F)79 mm (3.1 inches)65%very high
October Weather20°C (68°F)133 mm (5.2 inches)72%very high
November Weather13°C (56°F)54 mm (2.1 inches)82%high
December Weather11°C (51°F)52 mm (2.0 inches)87%moderate

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