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September Weather in Wilton, United States

Last updated: June 24, 2025

In September, the average temperature in Wilton, United States hovers around 15°C (60°F), with a range that can dip to a minimum of -1°C (30°F) and soar to a maximum of 35°C (95°F). Expect approximately 65 mm (2.6 in) of precipitation spread over about 6 days, and enjoy a relatively high average humidity of 69%.

September Temperature in Wilton

In September in Wilton, the average temperature is 15°C (60°F). Maximums can reach 35°C (95°F), while minimums can drop to as low as -1°C (30°F). Travelers should pack for a wide range of temperatures to ensure comfort during their visit.

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 15°C (60°F), with highs reaching up to 35°C (95°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec131128385568726859432920
Data source: Temperature data for Wilton generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Wilton

In Wilton, in September, the precipitation amount is 65 mm (2.6 in) over a period of 6 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 65 mm (2.6 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec131726284559656765501923
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Wilton

In Wilton in September, humidity is 69%. With an average temperature of 15°C (60°F), this humidity feels like a cool, damp embrace that can make outdoor activities feel slightly heavier and more exhausting, but still inviting for exploring the charming sights and sounds of the area.

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 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%88%78%75%76%79%78%78%69%71%82%84%
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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2459810987532
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.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (13°F)13 mm (0.5 inches)84%low
February Weather-12°C (11°F)17 mm (0.7 inches)88%moderate
March Weather-2°C (28°F)26 mm (1.0 inches)78%moderate
April Weather4°C (39°F)28 mm (1.1 inches)75%very high
May Weather13°C (55°F)45 mm (1.8 inches)76%very high
June Weather20°C (68°F)59 mm (2.3 inches)79%very high
July Weather22°C (72°F)65 mm (2.5 inches)78%very high
August Weather20°C (69°F)67 mm (2.6 inches)78%very high
September Weather15°C (60°F)65 mm (2.6 inches)69%high
October Weather6°C (43°F)50 mm (2.0 inches)71%moderate
November Weather-1°C (30°F)19 mm (0.8 inches)82%moderate
December Weather-7°C (20°F)23 mm (0.9 inches)84%low

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