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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 22°C (72°F). However, it can experience a wide range, with minimums plunging to 5°C (41°F) and peaks reaching up to 35°C (96°F). Visitors should also prepare for 133 mm (5.2 in) of precipitation over approximately 9 days, while enjoying an average humidity of 68%.

September Temperature in Danbury

In September in Danbury, the average temperature is 22°C (72°F). The maximum can reach 35°C (96°F), while the minimum can drop as low as 5°C (41°F). It's a great time for travelers to enjoy a mix of warm days and cool evenings, so pack accordingly!

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 22°C (72°F), with highs reaching up to 35°C (96°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec394550586774787671624843
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 133 mm (5.2 in) spread over a duration 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 133 mm (5.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec8111980136129907310513312385109
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 22°C (72°F), this humidity feels like a warm embrace, slightly stifling but still manageable for traveling, creating an atmosphere that encourages leisurely outdoor activities while prompting occasional breaks for refreshment.

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.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101110109853
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 Weather4°C (40°F)81 mm (3.2 inches)87%moderate
February Weather7°C (45°F)118 mm (4.7 inches)87%high
March Weather10°C (50°F)80 mm (3.2 inches)86%very high
April Weather15°C (59°F)136 mm (5.3 inches)84%very high
May Weather19°C (67°F)129 mm (5.1 inches)83%very high
June Weather23°C (74°F)90 mm (3.5 inches)83%extreme
July Weather26°C (79°F)73 mm (2.9 inches)79%very high
August Weather25°C (76°F)105 mm (4.1 inches)66%very high
September Weather22°C (72°F)133 mm (5.2 inches)68%very high
October Weather17°C (62°F)123 mm (4.8 inches)78%very high
November Weather9°C (48°F)85 mm (3.3 inches)89%moderate
December Weather6°C (44°F)109 mm (4.3 inches)86%moderate

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