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September Weather in Danbury, United States

Last updated: June 24, 2025

In September, the average temperature in Danbury, United States is a pleasant 19°C (66°F), with a minimum of 4°C (39°F) and a maximum soaring up to 33°C (91°F). Expect about 122 mm (4.8 in) of precipitation spread over 9 days, contributing to an average humidity of 68%. Enjoy the mild climate, but be prepared for the occasional rain!

September Temperature in Danbury

In September in Danbury, the average temperature is 19°C (66°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop as low as 4°C (39°F). This makes Danbury an ideal destination for travelers seeking a pleasant climate with a range of temperatures.

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

The chart illustrates September temperature patterns in Danbury, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Danbury, September typically has an average temperature of 19°C (66°F), with highs reaching up to 33°C (91°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec303338495969747366564234
Data source: Temperature data for Danbury 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 Danbury

In Danbury in September, the precipitation amount is 122 mm (4.8 in) over a span of 9 days.

September Precipitation Trends in Danbury

The chart displays monthly precipitation patterns in Danbury, 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 Danbury, September typically receives around 122 mm (4.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec71978912411510214511912214793115
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Danbury

In Danbury in September humidity is 68%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, creating a sticky atmosphere that can be a bit uncomfortable for traveling.

September Average Humidity in Danbury

This chart illustrates the average monthly humidity levels in Danbury, 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 Danbury is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Danbury

In Danbury 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 Danbury.

Maximum UV Index Levels in Danbury for September

The chart shows the monthly maximum UV Index (UVI) for Danbury 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 Danbury typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Danbury 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 Danbury Compares to Other Months

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

This table compares monthly weather conditions in Danbury, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)71 mm (2.8 inches)84%moderate
February Weather0°C (33°F)97 mm (3.8 inches)82%moderate
March Weather3°C (38°F)89 mm (3.5 inches)81%high
April Weather9°C (49°F)124 mm (4.9 inches)78%very high
May Weather15°C (59°F)115 mm (4.5 inches)69%very high
June Weather20°C (69°F)102 mm (4.0 inches)69%very high
July Weather24°C (75°F)145 mm (5.7 inches)62%very high
August Weather23°C (73°F)119 mm (4.7 inches)65%very high
September Weather19°C (66°F)122 mm (4.8 inches)68%very high
October Weather13°C (56°F)147 mm (5.8 inches)74%high
November Weather6°C (42°F)93 mm (3.7 inches)82%moderate
December Weather1°C (34°F)115 mm (4.5 inches)80%low

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