September weather forecastSouthport, CT
September
Weather in September
Southport, in September, begins its descent towards cooler weather from the summer peaks. There is a significant drop in temperatures from August, signaling the onset of the fall season. However, the sea temperatures, although lower than August, remain relatively warm allowing for water-based activities. Interestingly, despite the decrease in daylight hours, there's an increase in the number of sunshine days. All in all, the weather in Southport through September introduces a transition from the summer highs to a cooler fall.Temperature
As August transitions into September, Southport sees a gentle drop in the average high-temperature, transitioning from a moderately hot 80.1°F (26.7°C) to an agreeable 73°F (22.8°C). During September nights, Southport witnesses a consistent average temperature of 61.7°F (16.5°C).Humidity
The average relative humidity in September in Southport is 75%.Rainfall
In Southport, in September, it is raining for 13.5 days, with typically 2.56" (65mm) of accumulated precipitation. In Southport, during the entire year, the rain falls for 170.1 days and collects up to 37.76" (959mm) of precipitation.Snowfall
May through October are months without snowfall.Ocean temperature
In Southport, in September, the average water temperature is 68.7°F (20.4°C).Note: In water with a temperature of 68.7°F (20.4°C), most people do not enjoy swimming. As the temperature descends from 69.8°F (21°C) to 59°F (15°C), breathing becomes increasingly difficult to control.
Daylight
The average length of the day in September in Southport is 12h and 28min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:49 am and sunset at 6:36 pm EDT.
Sunshine
In Southport, the average sunshine in September is 9h.UV index
In Southport, Connecticut, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Undertake precautions - Obligation exists to protect against skin and eye damage. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. 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
Southport, CT
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in September: 61.7°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).
Average pressure in September
Southport, 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
Southport, CT
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
Southport, CT
- Average humidity in September: 75%
The months with the highest relative humidity are May and June (76%).
The months with the lowest relative humidity are April and November (72%).
Average rainfall in September
Southport, CT
- Average rainfall in September: 2.56"
The wettest month (with the highest rainfall) is December (4.21").
The driest month (with the least rainfall) is January (2.48").
Average rainfall days in September
Southport, CT
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is January (9.4 days).
Average snowfall in September
Southport, CT
- Average snowfall in September: 0"
The month with the highest snowfall is March (2.8").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Southport, CT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in September
Southport, CT
- Average sea temperature in September: 68.7°F
The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is February (39°F).
Average daylight in September /
Average sunshine in September
Southport, 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 18min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days in September
Southport, CT
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is June (11.2 days).
Average UV index in September
Southport, 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
Southport, CT
- Average cloud cover in September: 33
The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Southport, 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).
