September weather forecastHamden, CT
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Hamden, Connecticut, with an average temperature fluctuating between 58.1°F (14.5°C) and 73.2°F (22.9°C).Temperature
In September, the average high-temperature marginally decreases from a moderately hot 80.1°F (26.7°C) in August to an agreeable 73.2°F (22.9°C). Hamden reports an average low-temperature of 58.1°F (14.5°C) during the nights of September.Humidity
In September, the average relative humidity is 77%.Rainfall
In September, in Hamden, the rain falls for 10.8 days. Throughout September, 1.02" (26mm) of precipitation is accumulated. Throughout the year, there are 134.2 rainfall days, and 15.12" (384mm) of precipitation is accumulated.Snowfall
In Hamden, Connecticut, snow does not fall in June through October.Daylight
The average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:18 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:34 pm EDT.
Sunshine
In September, the average sunshine is 8.8h.UV index
In Hamden, Connecticut, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: An average UV index of 4 in September transforms into this advice:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hamden, CT
- Average high temperature in September: 73.2°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (34.5°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in September
Hamden, 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
Hamden, CT
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in September
Hamden, 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 (72%).
Average rainfall in September
Hamden, CT
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is July (1.69").
The driest month (with the least rainfall) is February (0.79").
Average rainfall days in September
Hamden, CT
- Average rainfall days in September: 10.8 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is January (7.2 days).
Average snowfall in September
Hamden, CT
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.14").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Hamden, CT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (6.7 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Hamden, CT
- Average daylight in September: 12h and 30min
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 48min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Hamden, CT
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is June (13.2 days).
Average UV index in September
Hamden, CT
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Hamden, CT
- Average cloud cover in September: 35
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Hamden, CT
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
