September Weather in Lyons, United States

Last updated: June 24, 2025

In September, the average temperature in Lyons, United States is a pleasant 26°C (80°F). Visitors can expect a range between a minimum of 13°C (56°F) and a maximum of 38°C (101°F). During this time, 94 mm (3.7 in) of precipitation is typical, often spread across approximately 11 days. With an average humidity of 83%, prepare for a warm and humid climate!

September Temperature in Lyons

In September in Lyons, the average temperature is 26°C (80°F). Maximums can reach 38°C (101°F), and minimums can be as low as 13°C (56°F). Visitors should be prepared for warm weather, with the possibility of cooler evenings, making it an ideal time for both outdoor adventures and leisurely explorations.

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 26°C (80°F), with highs reaching up to 38°C (101°F) and lows dropping to around 13°C (56°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 precipitation amount is 94 mm (3.7 in) over the course of 11 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 94 mm (3.7 inches) of precipitation spread over approximately 11 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 83%. With an average temperature of 26°C (80°F), this humidity feels like a warm, enveloping blanket that can make traveling quite uncomfortable; you may find yourself needing frequent breaks for hydration and cool shade as the thick air clings to your skin.

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 83%, 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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. 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 10, 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	11°C (52°F)	78 mm (3.1 inches)	86%	moderate
February Weather	14°C (57°F)	97 mm (3.8 inches)	81%	high
March Weather	16°C (62°F)	72 mm (2.8 inches)	81%	very high
April Weather	20°C (68°F)	84 mm (3.3 inches)	79%	very high
May Weather	24°C (76°F)	79 mm (3.1 inches)	75%	extreme
June Weather	27°C (80°F)	103 mm (4.1 inches)	75%	extreme
July Weather	29°C (84°F)	124 mm (4.9 inches)	80%	extreme
August Weather	28°C (83°F)	115 mm (4.5 inches)	81%	extreme
September Weather	26°C (80°F)	94 mm (3.7 inches)	83%	very high
October Weather	22°C (72°F)	79 mm (3.1 inches)	78%	very high
November Weather	15°C (58°F)	58 mm (2.3 inches)	85%	high
December Weather	12°C (54°F)	123 mm (4.8 inches)	87%	moderate