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September Weather in Vermilion, United States

Last updated: June 24, 2025

In Vermilion, United States, the average temperature in September hovers around 20°C (69°F), with a minimum of 11°C (52°F) and a pleasant maximum of 29°C (85°F). Rainfall is moderate, with about 84 mm (3.3 in) expected over 9 days, contributing to an average humidity level of 77%.

September Temperature in Vermilion

In September, in Vermilion, the average temperature is 20°C (69°F). The maximum can reach 29°C (85°F), and the minimum can be as low as 11°C (52°F). This mild climate makes Vermilion an ideal destination for travelers seeking comfortable weather and outdoor activities.

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

The chart illustrates September temperature patterns in Vermilion, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Vermilion, September typically has an average temperature of 20°C (69°F), with highs reaching up to 29°C (85°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec303137465869757468584336
Data source: Temperature data for Vermilion 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 Vermilion

In Vermilion in September, the precipitation amount is 84 mm (3.3 in) spread over 9 days.

September Precipitation Trends in Vermilion

The chart displays monthly precipitation patterns in Vermilion, 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 Vermilion, September typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec939999121125108116828411811597
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Vermilion

In Vermilion in September, humidity is 77%. With an average temperature of 20°C (69°F), this humidity feels like a sultry embrace, making travel comfortable yet slightly sticky, as the moist air clings to your skin with every step you take.

September Average Humidity in Vermilion

This chart illustrates the average monthly humidity levels in Vermilion, 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 Vermilion is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Vermilion

In Vermilion 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 Vermilion.

Maximum UV Index Levels in Vermilion for September

The chart shows the monthly maximum UV Index (UVI) for Vermilion 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 Vermilion typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810101098642
Data source: Vermilion 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 Vermilion Compares to Other Months

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

This table compares monthly weather conditions in Vermilion, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)93 mm (3.7 inches)88%moderate
February Weather0°C (32°F)99 mm (3.9 inches)88%moderate
March Weather3°C (38°F)99 mm (3.9 inches)87%high
April Weather8°C (46°F)121 mm (4.8 inches)87%very high
May Weather14°C (58°F)125 mm (4.9 inches)81%very high
June Weather20°C (69°F)108 mm (4.2 inches)83%very high
July Weather24°C (75°F)115 mm (4.5 inches)82%very high
August Weather23°C (74°F)82 mm (3.2 inches)76%very high
September Weather20°C (69°F)84 mm (3.3 inches)77%very high
October Weather15°C (59°F)118 mm (4.6 inches)82%high
November Weather6°C (43°F)115 mm (4.5 inches)89%moderate
December Weather2°C (36°F)97 mm (3.8 inches)86%low

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