September weather forecast
Danbury, CT

Weather in September

The first month of the autumn, September, is still a pleasant month in Danbury, Connecticut, with temperature in the range of an average low of 56.5°F (13.6°C) and an average high of 73°F (22.8°C).

Temperature

In September, the average high-temperature marginally drops from a warm 80.2°F (26.8°C) in August to a pleasant 73°F (22.8°C). In Danbury, the average low-temperature is 56.5°F (13.6°C).

Humidity

In September, the average relative humidity in Danbury, Connecticut, is 78%.

Rainfall

In September, the rain falls for 9.7 days. Throughout September, 0.67" (17mm) of precipitation is accumulated. Throughout the year, there are 123.7 rainfall days, and 11.65" (296mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall in Danbury.

Daylight

In September, the average length of the day in Danbury, Connecticut, is 12h and 28min.
On the first day of the month, sunrise is at 6:20 am and sunset at 7:27 pm. On the last day of September, in Danbury, sunrise is at 6:49 am and sunset at 6:37 pm EDT.

Sunshine

In September, the average sunshine in Danbury, Connecticut, is 8.6h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Danbury?

In Danbury, the average relative humidity in September is 78%.

How many days does it rain in September in Danbury?

In Danbury, Connecticut, in September, it is raining for 9.7 days, with typically 0.67" (17mm) of accumulated precipitation.

When it does not snow in Danbury?

May through September are months without snowfall in Danbury.

Does it snow in Danbury in September?

In Danbury, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Danbury have in September?

In September, the average day length in Danbury is 12h and 28min.

When are sunrise and sunset in September in Danbury?

On the first day of September in Danbury, sunrise is at 6:20 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:37 pm EDT.

How long on average sun shines in September in Danbury?

The average sunshine duration in September in Danbury, Connecticut, is 8.6h.

What is the UV index intensity in September in Danbury?

The average daily maximum UV index in September in Danbury is 4. A UV Index reading of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Danbury, CT

Average temperature in September - Danbury, CT
  • Average high temperature in September: 73°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in September: 56.5°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

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Average pressure in September
Danbury, CT

Average pressure in September - Danbury, CT
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Danbury, CT

Average wind speed in September - Danbury, CT
  • Average wind speed in September: 5.9mph

The windiest months (with the highest average wind speed) are January and March (8.2mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

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Average humidity in September
Danbury, CT

Average humidity in September - Danbury, CT
  • Average humidity in September: 78%

The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in September
Danbury, CT

Average rainfall in September - Danbury, CT
  • Average rainfall in September: 0.67"

The wettest month (with the highest rainfall) is July (1.57").
The driest months (with the least rainfall) are January and February (0.55").

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Average rainfall days in September
Danbury, CT

Average rainfall days in September - Danbury, CT
  • Average rainfall days in September: 9.7 days

The month with the highest number of rainy days is July (14.4 days).
The month with the least rainy days is January (5.5 days).

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Average snowfall in September
Danbury, CT

Average snowfall in September - Danbury, CT
  • Average snowfall in September: 0"

The months with the highest snowfall are January and February (0.75").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Danbury, CT

Average snowfall days in September - Danbury, CT
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (5.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Danbury, CT

Average daylight in September / Average sunshine in September - Danbury, CT
  • Average daylight in September: 12h and 28min

The month with the longest days is June (Average daylight: 15h and 7min).
The month with the shortest days is December (Average daylight: 9h and 14min).

  • Average sunshine in September: 8h and 36min

The months with the most sunshine are July and August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

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Average sunshine days in September
Danbury, CT

Average sunshine days in September - Danbury, CT
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is January (22.5 days).
The month with the least sunshine days is June (13.3 days).

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Average UV index in September
Danbury, CT

Average UV index in September - Danbury, CT
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in September
Danbury, CT

Average cloud cover in September - Danbury, CT
  • Average cloud cover in September: 37

The months with the most cloud cover are February, March and December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 33).

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Average visibility in September
Danbury, CT

Average visibility in September - Danbury, CT
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, July, August, September, October, November and December (6mi).
The months with the lowest visibility are May and June (5mi).

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