September Weather in Mentor, United States

Last updated: June 24, 2025

In September, the average temperature in Mentor, United States hovers around 20°C (68°F), providing a pleasant climate for outdoor adventures. Expect temperatures to range from a cool 10°C (50°F) to a warm 29°C (84°F), making layering a smart choice. Be prepared for some rain, as 95 mm (3.7 in) of precipitation typically graces the area over about 10 days. With an average humidity of 77%, it's wise to stay hydrated while enjoying the vibrant scenery!

September Temperature in Mentor

In September in Mentor, the average temperature is 20°C (68°F). Maximums can reach 29°C (84°F), and minimums can be as low as 10°C (50°F). This pleasant climate makes Mentor an ideal destination for travelers looking to enjoy mild weather and outdoor activities.

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

The chart illustrates September temperature patterns in Mentor, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mentor, September typically has an average temperature of 20°C (68°F), with highs reaching up to 29°C (84°F) and lows dropping to around 10°C (50°F).

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

September Precipitation in Mentor

In Mentor in September, the total precipitation amount is 95 mm (3.7 in) over the course of 10 days.

September Precipitation Trends in Mentor

The chart displays monthly precipitation patterns in Mentor, 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 Mentor, September typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 10 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Mentor

In Mentor in September, humidity is 77%. With an average temperature of 20°C (68°F), this humidity feels like a warm, sticky embrace, making it essential for travelers to stay hydrated and take breaks in shaded areas to avoid feeling sluggish in the heat.

September Average Humidity in Mentor

This chart illustrates the average monthly humidity levels in Mentor, 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 Mentor is approximately 77%, 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 Mentor

In Mentor 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 Mentor.

Maximum UV Index Levels in Mentor for September

The chart shows the monthly maximum UV Index (UVI) for Mentor 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 Mentor typically reaches 8, which falls under the very high exposure category.

Data source: Mentor 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 Mentor Compares to Other Months

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

This table compares monthly weather conditions in Mentor, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	100 mm (4.0 inches)	88%	moderate
February Weather	-1°C (31°F)	101 mm (4.0 inches)	88%	moderate
March Weather	2°C (36°F)	99 mm (3.9 inches)	87%	high
April Weather	7°C (44°F)	113 mm (4.5 inches)	87%	very high
May Weather	13°C (56°F)	115 mm (4.5 inches)	81%	very high
June Weather	19°C (67°F)	98 mm (3.9 inches)	83%	very high
July Weather	23°C (73°F)	113 mm (4.5 inches)	82%	very high
August Weather	22°C (73°F)	83 mm (3.3 inches)	76%	very high
September Weather	20°C (68°F)	95 mm (3.7 inches)	77%	very high
October Weather	14°C (58°F)	140 mm (5.5 inches)	82%	high
November Weather	6°C (43°F)	133 mm (5.2 inches)	89%	moderate
December Weather	2°C (36°F)	116 mm (4.6 inches)	86%	low