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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 20°C (67°F), perfect for outdoor activities. Expect a minimum temperature of 3°C (38°F) and a maximum that can soar up to 34°C (93°F). However, be prepared for some moisture, as the region receives about 57 mm (2.2 in) of precipitation over 8 days. With an average humidity of 78%, the weather can feel quite tropical. Enjoy your stay!

September Temperature in Lyons

In September in Lyons, the average temperature is 20°C (67°F). The maximum can reach 34°C (93°F), and the minimum can be as low as 3°C (38°F). This variation in temperature 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 20°C (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec282939486171757367554034
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 57 mm (2.2 in) over the course of 8 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 57 mm (2.2 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec68698393138961098557948154
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 20°C (67°F), this humidity feels like walking through a warm, thick blanket, making travel a bit sticky and requiring frequent breaks to find shade and cool refreshments.

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.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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-2°C (28°F)68 mm (2.7 inches)88%moderate
February Weather-2°C (29°F)68 mm (2.7 inches)87%moderate
March Weather4°C (39°F)83 mm (3.3 inches)87%high
April Weather9°C (49°F)93 mm (3.6 inches)87%very high
May Weather16°C (61°F)138 mm (5.4 inches)81%very high
June Weather22°C (71°F)96 mm (3.8 inches)82%very high
July Weather24°C (76°F)109 mm (4.3 inches)81%very high
August Weather23°C (73°F)85 mm (3.3 inches)78%very high
September Weather20°C (67°F)57 mm (2.2 inches)78%very high
October Weather13°C (56°F)94 mm (3.7 inches)82%high
November Weather4°C (40°F)81 mm (3.2 inches)89%moderate
December Weather1°C (34°F)54 mm (2.1 inches)86%low

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