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September Weather in Denison, United States

Last updated: June 24, 2025

In September, the average temperature in Denison, United States is a pleasant 25°C (78°F). Temperatures can vary significantly, with daily lows dipping to 11°C (52°F) and soaring high to 37°C (98°F). Expect a moderate precipitation of 104 mm (4.1 in) over approximately 6 days, alongside an average humidity level of 65%, creating a unique blend of warmth and moisture.

September Temperature in Denison

In September, in Denison, the average temperature is 25°C (78°F). Maximums can reach 37°C (98°F), and minimums can drop to as low as 11°C (52°F). Be prepared for a warm and varied climate, making it an ideal time for both outdoor adventures and comfortable evenings.

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

The chart illustrates September temperature patterns in Denison, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Denison, September typically has an average temperature of 25°C (78°F), with highs reaching up to 37°C (98°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec454758637380848378665450
Data source: Temperature data for Denison 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 Denison

In Denison in September, the precipitation amount is 104 mm (4.1 in) over the course of 6 days.

September Precipitation Trends in Denison

The chart displays monthly precipitation patterns in Denison, 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 Denison, September typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec5995129130158109531021041655869
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Denison

In Denison in September, humidity is 65%. With an average temperature of 25°C (78°F), this humidity feels like a warm, enveloping shawl that makes traveling slightly more strenuous, requiring frequent breaks to stay refreshed and hydrated.

September Average Humidity in Denison

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

In Denison 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 Denison.

Maximum UV Index Levels in Denison for September

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

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

This table compares monthly weather conditions in Denison, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)59 mm (2.3 inches)80%moderate
February Weather8°C (47°F)95 mm (3.7 inches)79%high
March Weather14°C (58°F)129 mm (5.1 inches)78%very high
April Weather17°C (63°F)130 mm (5.1 inches)78%very high
May Weather23°C (73°F)158 mm (6.2 inches)81%extreme
June Weather27°C (81°F)109 mm (4.3 inches)78%extreme
July Weather29°C (84°F)53 mm (2.1 inches)73%extreme
August Weather28°C (83°F)102 mm (4.0 inches)66%extreme
September Weather25°C (78°F)104 mm (4.1 inches)65%very high
October Weather19°C (66°F)165 mm (6.5 inches)72%very high
November Weather12°C (55°F)58 mm (2.3 inches)82%high
December Weather10°C (50°F)69 mm (2.7 inches)87%moderate

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