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September Weather in Isle, United States

Last updated: June 24, 2025

In September, the average temperature in Isle, United States is a pleasant 16°C (62°F). Expect a range from a cool 2°C (36°F) to a warm 29°C (84°F). During this month, you'll encounter approximately 107 mm (4.2 in) of precipitation over 11 days, contributing to an average humidity of 77%. Plan accordingly to enjoy all that this vibrant locale has to offer!

September Temperature in Isle

In September in Isle, the average temperature is 16°C (62°F). The maximum can reach 29°C (84°F), while the minimum can drop as low as 2°C (36°F). This diverse temperature range makes Isle an ideal destination for travelers seeking both warm days and cooler nights.

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

The chart illustrates September temperature patterns in Isle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isle, September typically has an average temperature of 16°C (62°F), with highs reaching up to 29°C (84°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec131328385568726961463020
Data source: Temperature data for Isle 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 Isle

In Isle in September, the precipitation amount is 107 mm (4.2 in) spread over a period of 11 days.

September Precipitation Trends in Isle

The chart displays monthly precipitation patterns in Isle, 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 Isle, September typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec2026467779851001141071303756
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Isle

In Isle in September, humidity is 77%. With an average temperature of 16°C (62°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel heavy and draining, so travelers may want to plan for breaks in shaded areas and stay hydrated.

September Average Humidity in Isle

This chart illustrates the average monthly humidity levels in Isle, 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 Isle is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%93%88%83%76%76%76%77%77%82%88%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Isle

In Isle in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Isle.

Maximum UV Index Levels in Isle for September

The chart shows the monthly maximum UV Index (UVI) for Isle 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 Isle typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457810987532
Data source: Isle 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 Isle Compares to Other Months

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

This table compares monthly weather conditions in Isle, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (13°F)20 mm (0.8 inches)92%low
February Weather-11°C (13°F)26 mm (1.0 inches)93%moderate
March Weather-2°C (29°F)46 mm (1.8 inches)88%moderate
April Weather3°C (39°F)77 mm (3.0 inches)83%high
May Weather13°C (55°F)79 mm (3.1 inches)76%very high
June Weather20°C (68°F)85 mm (3.3 inches)76%very high
July Weather22°C (73°F)100 mm (3.9 inches)76%very high
August Weather20°C (69°F)114 mm (4.5 inches)77%very high
September Weather16°C (62°F)107 mm (4.2 inches)77%high
October Weather8°C (46°F)130 mm (5.1 inches)82%moderate
November Weather-1°C (30°F)37 mm (1.5 inches)87%moderate
December Weather-7°C (20°F)56 mm (2.2 inches)89%low

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