September weather forecast
Durham, CT

Share

Weather in September

The first month of the autumn, September, is also a moderately hot month in Durham, Connecticut, with temperature in the range of an average high of 73.4°F (23°C) and an average low of 56.5°F (13.6°C).

Temperature

During the shift to September, a minor reduction in average high-temperature is observed, shifting from a warm 80.6°F (27°C) in August to a still moderately hot 73.4°F (23°C). Durham experiences an average temperature drop to a moderate 56.5°F (13.6°C) during September nights.

Humidity

In Durham, the average relative humidity in September is 77%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.1 days and accumulates 1.97" (50mm) of precipitation.

Snowfall

June through October are months without snowfall.

Daylight

In Durham, the average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:17 am and sunset at 7:23 pm. On the last day of September, in Durham, sunrise is at 6:47 am and sunset at 6:33 pm EDT.

Sunshine

The average sunshine in September in Durham is 8.4h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.
Note: The daily maximum UV index of 4 in September interprets into the following advice:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Updated: Jun 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

In September, the average high-temperature and low-temperature in Durham are 73.4°F (23°C) and 56.5°F (13.6°C) respectively. In August, the average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, is appraised at 84.2°F (29°C).

What is the average humidity in September?

The average relative humidity in September is 77%.

What is the driest month in Durham?

September is the month with the least rainfall. Rain falls for 12.1 days and accumulates 1.97" (50mm) of precipitation.

How many days does it rain in September in Durham?

In Durham, in September, during 12.1 rainfall days, 1.97" (50mm) of precipitation is typically accumulated.

When it does not snow?

In Durham, snow does not fall in June through October.

How many hours of daylight does Durham have in September?

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

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:17 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:33 pm EDT.

How many hours of sunshine does Durham have in September?

In September, the average sunshine duration is 8.4h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Durham, CT

Average temperature in September - Durham, CT
  • Average high temperature in September: 73.4°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in September: 56.5°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).

Average pressure in September
Durham, CT

Average pressure in September - Durham, CT
  • Average pressure in September: 30.05"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).

Average wind speed in September
Durham, CT

Average wind speed in September - Durham, CT
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is January (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in September
Durham, CT

Average humidity in September - Durham, CT
  • Average humidity in September: 77%

The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (71%).

Average rainfall in September
Durham, CT

Average rainfall in September - Durham, CT
  • Average rainfall in September: 1.97"

The wettest month (with the highest rainfall) is December (3.74").
The driest month (with the least rainfall) is September (1.97").

Average rainfall days in September
Durham, CT

Average rainfall days in September - Durham, CT
  • Average rainfall days in September: 12.1 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in September
Durham, CT

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

The month with the highest snowfall is March (4.33").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in September
Durham, CT

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

The month with the highest number of snowfall days is February (8.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Durham, CT
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 8h and 2min

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 36min).

Average sunshine days in September
Durham, CT

Average sunshine days in September - Durham, CT
  • Average sunshine days in September: 14.9 days

The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is June (11.5 days).

Average UV index in September
Durham, CT

Average UV index in September - Durham, 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).

Average cloud cover in September
Durham, CT

Average cloud cover in September - Durham, CT
  • Average cloud cover in September: 39

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).

Average visibility in September
Durham, CT

Average visibility in September - Durham, CT
  • Average visibility in September: 5mi

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

Durham, Connecticut, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location