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September Weather in Sully, United States

Last updated: June 24, 2025

In September, the average temperature in Sully, United States is a comfortable 20°C (69°F). Expect a minimum drop to 5°C (41°F) and a warm maximum of 33°C (92°F). Be prepared for some rain, as the region sees an average precipitation of 121 mm (4.8 in) over approximately 8 days. With an average humidity of 73%, it's a good idea to stay hydrated and enjoy the climate!

September Temperature in Sully

In September in Sully, the average temperature is 20°C (69°F), with maximums reaching 33°C (92°F) and minimums dropping to as low as 5°C (41°F). This makes it an ideal time for travelers to experience a pleasant mix of warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Sully, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sully, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec222440496374777368533931
Data source: Temperature data for Sully 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 Sully

In Sully in September, the precipitation amount is 121 mm (4.8 in) over the course of 8 days.

September Precipitation Trends in Sully

The chart displays monthly precipitation patterns in Sully, 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 Sully, September typically receives around 121 mm (4.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec4449847416312472651211374940
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sully

In Sully in September humidity is 73%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making travel slightly sticky but ultimately comfortable as long as you stay hydrated and take breaks in the shade.

September Average Humidity in Sully

This chart illustrates the average monthly humidity levels in Sully, 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 Sully is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sully

In Sully 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 Sully.

Maximum UV Index Levels in Sully for September

The chart shows the monthly maximum UV Index (UVI) for Sully 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 Sully typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Sully 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 Sully Compares to Other Months

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

This table compares monthly weather conditions in Sully, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)44 mm (1.7 inches)78%moderate
February Weather-4°C (24°F)49 mm (1.9 inches)80%moderate
March Weather4°C (40°F)83 mm (3.3 inches)77%high
April Weather10°C (50°F)74 mm (2.9 inches)77%very high
May Weather17°C (63°F)163 mm (6.4 inches)77%very high
June Weather23°C (74°F)124 mm (4.9 inches)81%extreme
July Weather25°C (77°F)72 mm (2.8 inches)81%very high
August Weather23°C (74°F)65 mm (2.5 inches)77%very high
September Weather20°C (69°F)121 mm (4.8 inches)73%very high
October Weather12°C (53°F)137 mm (5.4 inches)75%high
November Weather4°C (39°F)49 mm (1.9 inches)85%moderate
December Weather0°C (31°F)40 mm (1.6 inches)83%moderate

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