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September Weather in Circle, United States

Last updated: June 24, 2025

In Circle, United States, the average temperature in September is a mild 15°C (60°F). However, temperatures can swing dramatically, with minimums dropping to -2°C (28°F) and soaring up to a maximum of 36°C (97°F). Expect an average precipitation amount of 59 mm (2.3 in) over about 5 days, while the typical humidity sits at a comfortable 67%.

September Temperature in Circle

In September in Circle, the average temperature is 15°C (60°F). Maximums can reach 36°C (97°F), while minimums can dip as low as -2°C (28°F). This wide temperature range means travelers should be prepared for both warm days and chilly evenings.

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

The chart illustrates September temperature patterns in Circle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Circle, September typically has an average temperature of 15°C (60°F), with highs reaching up to 36°C (97°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec191532415567747160433224
Data source: Temperature data for Circle 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 Circle

In Circle in September, the precipitation amount is 59 mm (2.3 in) over the course of 5 days.

September Precipitation Trends in Circle

The chart displays monthly precipitation patterns in Circle, 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 Circle, September typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec122720294377302859282220
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Circle

In Circle in September, humidity is 67%. With an average temperature of 15°C (60°F), this humidity feels like a warm, slightly muggy embrace, making it feel a bit heavier as you travel. You may find yourself sweating a little more than usual, and staying hydrated becomes essential as you explore your surroundings.

September Average Humidity in Circle

This chart illustrates the average monthly humidity levels in Circle, 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 Circle is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%83%76%70%76%78%78%73%67%68%77%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Circle

In Circle 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 Circle.

Maximum UV Index Levels in Circle for September

The chart shows the monthly maximum UV Index (UVI) for Circle 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 Circle typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2359810998532
Data source: Circle 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 Circle Compares to Other Months

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

This table compares monthly weather conditions in Circle, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)12 mm (0.5 inches)80%low
February Weather-10°C (15°F)27 mm (1.1 inches)83%moderate
March Weather0°C (32°F)20 mm (0.8 inches)75%moderate
April Weather5°C (42°F)29 mm (1.1 inches)70%very high
May Weather13°C (55°F)43 mm (1.7 inches)76%very high
June Weather19°C (67°F)77 mm (3.0 inches)78%very high
July Weather23°C (74°F)30 mm (1.2 inches)78%very high
August Weather21°C (71°F)28 mm (1.1 inches)73%very high
September Weather15°C (60°F)59 mm (2.3 inches)67%very high
October Weather6°C (44°F)28 mm (1.1 inches)68%moderate
November Weather0°C (33°F)21 mm (0.8 inches)77%moderate
December Weather-5°C (24°F)20 mm (0.8 inches)84%low

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