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September Weather in Oklahoma, United States

Last updated: June 24, 2025

In September, the average temperature in Oklahoma, United States is a pleasant 19°C (67°F). Temperatures can fluctuate, with a minimum of 4°C (40°F) and a maximum of 33°C (92°F). Expect about 126 mm (4.9 in) of precipitation over 10 days, contributing to an average humidity of 67%. Dress accordingly for a mix of mild and warm days!

September Temperature in Oklahoma

In September in Oklahoma, the average temperature is 19°C (67°F). Maximums can reach 33°C (92°F) while minimums can be as low as 4°C (40°F). This range makes it an ideal time for travelers to enjoy a variety of outdoor activities while also being prepared for cooler evenings.

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

The chart illustrates September temperature patterns in Oklahoma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oklahoma, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec313541516270747367574236
Data source: Temperature data for Oklahoma 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 Oklahoma

In Oklahoma in September, the precipitation amount is 126 mm (4.9 in) distributed over a span of 10 days.

September Precipitation Trends in Oklahoma

The chart displays monthly precipitation patterns in Oklahoma, 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 Oklahoma, September typically receives around 126 mm (4.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec941281111291591471459012611994105
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Oklahoma

In Oklahoma in September, humidity is 67%. With an average temperature of 19°C (67°F), this humidity feels like walking through a warm, soft blanket, making sightseeing and outdoor activities a bit more challenging but still enjoyable for those prepared with light clothing and plenty of hydration.

September Average Humidity in Oklahoma

This chart illustrates the average monthly humidity levels in Oklahoma, 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 Oklahoma is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Oklahoma

In Oklahoma in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Oklahoma.

Maximum UV Index Levels in Oklahoma for September

The chart shows the monthly maximum UV Index (UVI) for Oklahoma 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 Oklahoma typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098642
Data source: Oklahoma 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 Oklahoma Compares to Other Months

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

This table compares monthly weather conditions in Oklahoma, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)94 mm (3.7 inches)89%moderate
February Weather2°C (35°F)128 mm (5.0 inches)90%moderate
March Weather5°C (41°F)111 mm (4.4 inches)89%high
April Weather11°C (51°F)129 mm (5.1 inches)88%very high
May Weather17°C (62°F)159 mm (6.3 inches)80%very high
June Weather21°C (70°F)147 mm (5.8 inches)79%very high
July Weather23°C (75°F)145 mm (5.7 inches)74%very high
August Weather23°C (73°F)90 mm (3.6 inches)64%very high
September Weather19°C (67°F)126 mm (4.9 inches)67%very high
October Weather14°C (57°F)119 mm (4.7 inches)81%high
November Weather5°C (42°F)94 mm (3.7 inches)89%moderate
December Weather2°C (36°F)105 mm (4.1 inches)88%low

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