Southport
Connecticut, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Southport, CT

September, the first month of the autumn, in Southport, is still a pleasant month, with average temperature fluctuating between 61.7°F (16.5°C) and 73°F (22.8°C).

Temperature

In Southport, the average high-temperature marginally drops, from a warm 80.1°F (26.7°C) in August, to an agreeable 73°F (22.8°C). In Southport, in September, the average low-temperature is 61.7°F (16.5°C).

Humidity

The average relative humidity in Southport is 75%.

Rainfall

In Southport, during 13.5 rainfall days, 2.56" (65mm) of precipitation is typically accumulated. In Southport, Connecticut, during the entire year, the rain falls for 170.1 days and collects up to 37.76" (959mm) of precipitation.

Snowfall

In Southport snow does not fall in May through October.

Ocean temperature

In September, the average ocean temperature is 68.7°F (20.4°C).
Note: For most, swimming in 68.7°F (20.4°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

Daylight

In September, the average length of the day in Southport is 12.5h.

Sunshine

In Southport, the average sunshine is 9h.

UV index

In Southport, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Southport?

The average high-temperature, in September, in Southport, is 73°F (22.8°C), while the average low-temperature is 61.7°F (16.5°C).

What is the average humidity in September in Southport?

In Southport, the average relative humidity in September is 75%.

How much does it rain in Southport in September?

In September, in Southport, the rain falls for 13.5 days. Throughout September, 2.56" (65mm) of precipitation is accumulated.

When it does not snow in Southport?

In Southport, Connecticut, snow does not fall in May through October.

How cold is the water in September in Southport?

In Southport, the average seawater temperature in September is 68.7°F (20.4°C). For most, swimming in 68.7°F (20.4°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the average length of the day in September in Southport?

The average length of the day in September in Southport is 12.5h.

How long on average sun shines in September in Southport?

The average sunshine in September in Southport, Connecticut, is 9h.

How high is the UV index in September in Southport?

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 the exposure to the Sun's UV rays.
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 humidity in September - Southport, CT
  • Average humidity in September: 75%

Months with the highest relative humidity are May and June (76%).
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").
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).
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: 12.5h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 9h

The month with the most sunshine is July (Average sunshine: 10.6h).
Months with the least sunshine are February and December (Average sunshine: 4.8).

Average UV index in September - Southport, CT
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).