September weather forecastAnsonia, CT
September
Weather in September
September brings the charm of fall and the transition from summer's heat to the cooler temperatures of autumn. The city is adorned in beautiful hues, and the harsh sunlight begins to mellow. The temperatures during this month sway between 59.4°F (15.2°C) and 73°F (22.8°C). The differences in weather between August and October are evident as the city gradually moves into a colder phase.Temperature
In September, the average high-temperature marginally decreases from a warm 80.2°F (26.8°C) in August to an agreeable 73°F (22.8°C). An average nighttime temperature of 59.4°F (15.2°C) is observed in Ansonia, Connecticut, during September.Humidity
In September, the average relative humidity in Ansonia is 76%.Rainfall
The month with the least rainfall is September, when the rain falls for 13.1 days and typically collects 2.24" (57mm) of precipitation.Snowfall
May through October are months without snowfall in Ansonia.Daylight
The average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:19 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:35 pm EDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Ansonia, CT
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (34.7°F).
- Average low temperature in September: 59.4°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).
Average pressure in September
Ansonia, 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
Ansonia, CT
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in September
Ansonia, CT
- Average humidity in September: 76%
The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is April (72%).
Average rainfall in September
Ansonia, CT
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is December (4.06").
The driest month (with the least rainfall) is September (2.24").
Average rainfall days in September
Ansonia, CT
- Average rainfall days in September: 13.1 days
The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is January (9.4 days).
Average snowfall in September
Ansonia, CT
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.23").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Ansonia, CT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.8 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
Ansonia, 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 54min
The months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Ansonia, CT
- Average sunshine days in September: 14.4 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in September
Ansonia, 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
Ansonia, CT
- Average cloud cover in September: 34
The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Ansonia, CT
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
