September Weather in Wilton, United States

Last updated: June 24, 2025

In Wilton, United States, the average temperature in September hovers around 20°C (69°F), offering a pleasant climate. Visitors can expect a minimum temperature of 5°C (41°F) and a maximum reaching up to 34°C (94°F). The area experiences a moderate level of precipitation, with an average of 112 mm (4.4 in) over approximately 9 days. Moreover, the average humidity is around 78%, adding to the overall character of the weather during this month.

September Temperature in Wilton

In September in Wilton, the average temperature is 20°C (69°F). Maximums can reach 34°C (94°F), while minimums can drop as low as 5°C (41°F). This makes Wilton a suitable destination for travelers looking to experience mild weather with the possibility of warmer days.

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

The chart illustrates September temperature patterns in Wilton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wilton, September typically has an average temperature of 20°C (69°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°F).

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

September Precipitation in Wilton

In Wilton in September, the total precipitation amount is 112 mm (4.4 in), occurring over a span of 9 days.

September Precipitation Trends in Wilton

The chart displays monthly precipitation patterns in Wilton, 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 Wilton, September typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 9 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 Wilton

In Wilton in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

September Average Humidity in Wilton

This chart illustrates the average monthly humidity levels in Wilton, 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 Wilton is approximately 78%, 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 Wilton

In Wilton 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 Wilton.

Maximum UV Index Levels in Wilton for September

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

Data source: Wilton 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 Wilton Compares to Other Months

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

This table compares monthly weather conditions in Wilton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	52 mm (2.0 inches)	81%	moderate
February Weather	-3°C (26°F)	59 mm (2.3 inches)	81%	moderate
March Weather	4°C (40°F)	88 mm (3.4 inches)	81%	high
April Weather	10°C (50°F)	91 mm (3.6 inches)	82%	very high
May Weather	17°C (63°F)	144 mm (5.7 inches)	78%	very high
June Weather	23°C (74°F)	132 mm (5.2 inches)	81%	extreme
July Weather	25°C (77°F)	72 mm (2.8 inches)	79%	very high
August Weather	23°C (74°F)	73 mm (2.9 inches)	77%	very high
September Weather	20°C (69°F)	112 mm (4.4 inches)	78%	very high
October Weather	12°C (54°F)	122 mm (4.8 inches)	78%	high
November Weather	4°C (39°F)	50 mm (2.0 inches)	87%	moderate
December Weather	0°C (32°F)	47 mm (1.8 inches)	84%	moderate