September Weather in Lyons, United States

Last updated: June 24, 2025

In September, the average temperature in Lyons, United States hovers around 16°C (60°F). Expect a range where the minimum can dip to 3°C (37°F) while the maximum can rise to 34°C (94°F). During this month, anticipate 117 mm (4.6 in) of precipitation spread over 8 days, contributing to an average humidity of 71%.

September Temperature in Lyons

In September in Lyons, the average temperature is 16°C (60°F), with maximums soaring up to 34°C (94°F) and minimums dipping as low as 3°C (37°F). This variation in temperatures makes it an ideal time for travelers to enjoy a mix of warm days and cool evenings, perfect for exploring.

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 16°C (60°F), with highs reaching up to 34°C (94°F) and lows dropping to around 3°C (37°F).

Data source: Temperature data for Lyons generated using information from the Copernicus Climate Change Service.

September Precipitation in Lyons

In Lyons in September, the total precipitation amount is 117 mm (4.6 in) over a span 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 117 mm (4.6 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Lyons

In Lyons in September, humidity is 71%. With an average temperature of 16°C (60°F), this humidity feels like a warm, damp embrace, making outdoor activities slightly uncomfortable but still manageable for travelers who enjoy a refreshing change in climate.

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 71%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	230 mm (9.0 inches)	85%	low
February Weather	3°C (37°F)	290 mm (11.4 inches)	84%	moderate
March Weather	5°C (41°F)	198 mm (7.8 inches)	85%	high
April Weather	8°C (47°F)	193 mm (7.6 inches)	83%	high
May Weather	12°C (54°F)	95 mm (3.7 inches)	83%	very high
June Weather	15°C (60°F)	81 mm (3.2 inches)	83%	very high
July Weather	19°C (67°F)	7 mm (0.3 inches)	82%	very high
August Weather	20°C (68°F)	10 mm (0.4 inches)	74%	very high
September Weather	16°C (60°F)	117 mm (4.6 inches)	71%	very high
October Weather	10°C (50°F)	185 mm (7.3 inches)	81%	moderate
November Weather	6°C (43°F)	230 mm (9.1 inches)	87%	moderate
December Weather	3°C (38°F)	275 mm (10.8 inches)	87%	low