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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 20°C (68°F). Expect a range with minimums dipping to 4°C (40°F) and soaring highs of 35°C (95°F). With precipitation averaging 100 mm (3.9 in) over 9 days, the average humidity rests at a comfortable 75%.

September Temperature in Denison

In September in Denison, the average temperature is 20°C (68°F). Maximums can reach 35°C (95°F), and minimums can be as low as 4°C (40°F). This makes Denison an ideal destination for travelers, offering pleasant weather for a variety of outdoor activities.

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 20°C (68°F), with highs reaching up to 35°C (95°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec222338486174767367513729
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 100 mm (3.9 in) spread over 9 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 100 mm (3.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec27397966161105651121001173238
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 75%. With an average temperature of 20°C (68°F), this humidity feels like a warm, muggy embrace that can leave travelers feeling sticky and exhausted.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%73%75%78%82%83%81%75%75%82%83%
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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810111098642
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 Weather-5°C (23°F)27 mm (1.1 inches)76%moderate
February Weather-5°C (23°F)39 mm (1.5 inches)80%moderate
March Weather4°C (39°F)79 mm (3.1 inches)73%high
April Weather9°C (48°F)66 mm (2.6 inches)74%very high
May Weather16°C (61°F)161 mm (6.3 inches)78%very high
June Weather23°C (74°F)105 mm (4.1 inches)82%extreme
July Weather24°C (76°F)65 mm (2.6 inches)83%very high
August Weather23°C (73°F)112 mm (4.4 inches)80%very high
September Weather20°C (68°F)100 mm (3.9 inches)75%very high
October Weather10°C (51°F)117 mm (4.6 inches)75%high
November Weather3°C (38°F)32 mm (1.3 inches)82%moderate
December Weather-2°C (29°F)38 mm (1.5 inches)83%low

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