September Weather in Unionville, United States

Last updated: June 24, 2025

In Unionville, United States, the average temperature in September hovers around 21°C (70°F), with lows dipping to 6°C (44°F) and highs soaring up to 33°C (92°F). This month brings about 120 mm (4.7 in) of rainfall over approximately 8 days, contributing to an average humidity level of 73%. Enjoy the unique climate while exploring the beauty of the region!

September Temperature in Unionville

In September in Unionville, the average temperature is 21°C (70°F). Maximum can reach 33°C (92°F) and minimum can be as low as 6°C (44°F). This makes it a great time to visit Unionville, offering pleasant weather for outdoor activities while also allowing for cooler evenings.

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

The chart illustrates September temperature patterns in Unionville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Unionville, September typically has an average temperature of 21°C (70°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (44°F).

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

September Precipitation in Unionville

In Unionville in September, the total precipitation amount reaches 120 mm (4.7 in) over the course of 8 days.

September Precipitation Trends in Unionville

The chart displays monthly precipitation patterns in Unionville, 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 Unionville, September typically receives around 120 mm (4.7 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 Unionville

In Unionville in September, humidity is 73%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace that can make outdoor activities feel sweltering, so it's essential to stay hydrated and take breaks in the shade while exploring.

September Average Humidity in Unionville

This chart illustrates the average monthly humidity levels in Unionville, 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 Unionville is approximately 73%, 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 Unionville

In Unionville 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 Unionville.

Maximum UV Index Levels in Unionville for September

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

Data source: Unionville 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 Unionville Compares to Other Months

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

This table compares monthly weather conditions in Unionville, 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 (26°F)	51 mm (2.0 inches)	78%	moderate
February Weather	-2°C (28°F)	50 mm (2.0 inches)	80%	moderate
March Weather	6°C (42°F)	101 mm (4.0 inches)	77%	high
April Weather	10°C (51°F)	82 mm (3.2 inches)	77%	very high
May Weather	18°C (64°F)	155 mm (6.1 inches)	77%	very high
June Weather	24°C (76°F)	120 mm (4.7 inches)	81%	extreme
July Weather	26°C (79°F)	96 mm (3.8 inches)	81%	extreme
August Weather	24°C (75°F)	83 mm (3.3 inches)	77%	very high
September Weather	21°C (70°F)	120 mm (4.7 inches)	73%	very high
October Weather	12°C (54°F)	129 mm (5.1 inches)	75%	high
November Weather	5°C (40°F)	52 mm (2.0 inches)	85%	moderate
December Weather	1°C (34°F)	35 mm (1.4 inches)	83%	moderate