Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
In September, the average high-temperature marginally decreases from 80.6°F (27°C) in August to a still moderately hot 73.4°F (23°C). The average temperature during September nights dips to a refreshing 56.5°F (13.6°C).Humidity
The average relative humidity in September in Durham is 77%.Rainfall
September is the month with the least rainfall in Durham. Rain falls for 12.1 days and accumulates 1.97" (50mm) of precipitation.Snowfall
June through October are months without snowfall in Durham.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September in Durham, 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.
Sunshine
The average sunshine in September in Durham is 8.4h.UV index
In Durham, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: In September, the maximum UV index of 4 suggests these recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
What is the usual temperature for Durham in September?
What is the average humidity in September in Durham?
What is the driest month in Durham?
How many days does it rain in September in Durham?
When it does not snow in Durham?
What is the average length of the day in September in Durham?
When are sunrise and sunset in September in Durham?
How many hours of sunshine does Durham have in September?
How high is the UV index in September in Durham?
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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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
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