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September Weather in Lyons, United States

Last updated: June 24, 2025

In September, the average temperature in Lyons, United States is a pleasant 22°C (73°F). However, temperatures can range from a chilly 5°C (42°F) to a scorching 36°C (98°F). Prepare for a bit of rain, as the area experiences approximately 65 mm (2.6 in) of precipitation over 6 days. With an average humidity of 73%, it’s wise to stay hydrated and enjoy the mild climate!

September Temperature in Lyons

In September in Lyons, the average temperature is 22°C (73°F), with maximums reaching up to 36°C (98°F) and minimums dropping as low as 5°C (42°F). This climate makes Lyons an ideal destination for travelers looking to enjoy a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Lyons, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lyons, September typically has an average temperature of 22°C (73°F), with highs reaching up to 36°C (98°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec323347546578817772574537
Data source: Temperature data for Lyons 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 Lyons

In Lyons, in September, the precipitation amount is 65 mm (2.6 in) over a period of 6 days.

September Precipitation Trends in Lyons

The chart displays monthly precipitation patterns in Lyons, 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 Lyons, September typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec2727695416072709265852629
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lyons

In Lyons in September humidity is 73%. With an average temperature of 22°C (73°F), this humidity feels like a warm, sticky embrace that can be quite draining for travelers, making outdoor activities more challenging and encouraging frequent breaks in the shade.

September Average Humidity in Lyons

This chart illustrates the average monthly humidity levels in Lyons, 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 Lyons is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%78%67%70%82%81%80%80%74%71%79%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lyons

In Lyons in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Lyons.

Maximum UV Index Levels in Lyons for September

The chart shows the monthly maximum UV Index (UVI) for Lyons 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 Lyons typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109753
Data source: Lyons 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 Lyons Compares to Other Months

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

This table compares monthly weather conditions in Lyons, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)27 mm (1.0 inches)74%moderate
February Weather1°C (33°F)27 mm (1.1 inches)78%moderate
March Weather8°C (47°F)69 mm (2.7 inches)67%high
April Weather12°C (55°F)54 mm (2.1 inches)70%very high
May Weather18°C (65°F)160 mm (6.3 inches)82%very high
June Weather25°C (78°F)72 mm (2.9 inches)81%extreme
July Weather27°C (81°F)70 mm (2.8 inches)80%extreme
August Weather25°C (78°F)92 mm (3.6 inches)80%very high
September Weather22°C (73°F)65 mm (2.6 inches)73%very high
October Weather14°C (57°F)85 mm (3.4 inches)71%high
November Weather7°C (45°F)26 mm (1.0 inches)79%moderate
December Weather3°C (37°F)29 mm (1.2 inches)83%moderate

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