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September Weather in Lyons, United States

Last updated: June 24, 2025

In Lyons, United States, the average temperature in September hovers around 18°C (65°F). Expect a minimum of 3°C (39°F) and a maximum of 33°C (91°F) throughout the month. Rainfall averages 79 mm (3.1 in) spread over 9 days, while humidity levels remain high at approximately 78%.

September Temperature in Lyons

In September in Lyons, the average temperature is 18°C (65°F). The maximum can reach 33°C (91°F), while the minimum can drop as low as 3°C (39°F). This diverse range of temperatures makes Lyons an ideal destination for travelers seeking both warm days and cooler evenings.

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 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 3°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec272935465867737165544032
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 79 mm (3.1 in) spread over 9 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 79 mm (3.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec83837611711686151106791478995
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 78%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket, making travel quite muggy and potentially uncomfortable, as it can leave you feeling sticky and fatigued more quickly than usual.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
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 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 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24681010997532
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 Weather-3°C (27°F)83 mm (3.3 inches)90%low
February Weather-2°C (29°F)83 mm (3.3 inches)90%moderate
March Weather2°C (35°F)76 mm (3.0 inches)87%high
April Weather8°C (46°F)117 mm (4.6 inches)88%very high
May Weather15°C (59°F)116 mm (4.6 inches)82%very high
June Weather20°C (68°F)86 mm (3.4 inches)79%very high
July Weather23°C (73°F)151 mm (6.0 inches)78%very high
August Weather22°C (72°F)106 mm (4.2 inches)76%very high
September Weather18°C (65°F)79 mm (3.1 inches)78%high
October Weather12°C (55°F)147 mm (5.8 inches)84%moderate
November Weather4°C (40°F)89 mm (3.5 inches)89%moderate
December Weather0°C (33°F)95 mm (3.7 inches)86%low

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