September weather forecast and climate
Niantic, CT

Weather in September

The first month of the autumn, September, is also an agreeable month in Niantic, Connecticut, with average temperature fluctuating between 72°F (22.2°C) and 59.9°F (15.5°C).

Temperature

In September, the average high-temperature slightly decreases, from a warm 77.7°F (25.4°C) in August, to an agreeable 72°F (22.2°C). The average low-temperature, in Niantic, Connecticut, is 59.9°F (15.5°C).

Humidity

The average relative humidity in Niantic is 78%.

Rainfall

The month with the least rainfall in Niantic is September when the rain falls for 12 days and typically collects 1.65" (42mm) of precipitation.

Snowfall

May through October are months without snowfall in Niantic.

Ocean temperature

In Niantic, Connecticut, the average seawater temperature is 68.2°F (20.1°C).
Note: For most, swimming in 68.2°F (20.1°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 Niantic, the average length of the day is 12.5h.

Sunshine

In Niantic, the average sunshine in September is 8.9h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in September in Niantic?

In Niantic, Connecticut, the average relative humidity in September is 78%.

What is the driest month in Niantic?

The month with the least rainfall is September when the rain falls for 12 days and typically collects 1.65" (42mm) of precipitation.

How many days does it rain in September in Niantic?

In Niantic, during September, the rain falls for 12 days and regularly aggregates up to 1.65" (42mm) of precipitation.

When it does not snow in Niantic?

In Niantic snow does not fall in May through October.

How cold is the water in September in Niantic?

In Niantic, in September, the average water temperature is 68.2°F (20.1°C). Swimming in 68.2°F (20.1°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

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

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

How many hours of sunshine does Niantic have in September?

In September, the average sunshine is 8.9h.

What is the UV index reading in September in Niantic?

The average daily maximum UV index in September in Niantic is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Niantic, CT

Average temperature in September - Niantic, CT
  • Average high temperature in September: 72°F

The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in September: 59.9°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 (26.2°F).

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Average pressure in September
Niantic, CT

Average pressure in September - Niantic, CT
  • Average pressure in September: 30.05"

The month with the highest atmospheric pressure is November (30.08").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in September
Niantic, CT

Average wind speed in September - Niantic, CT
  • Average wind speed in September: 8.8mph

The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.8mph).

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Average humidity in September
Niantic, CT

Average humidity in September - Niantic, CT
  • Average humidity in September: 78%

The month with the highest relative humidity is June (80%).
Months with the lowest relative humidity are January, March, April and November (74%).

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Average rainfall in September
Niantic, CT

Average rainfall in September - Niantic, CT
  • Average rainfall in September: 1.65"

The wettest month (with the highest rainfall) is December (3.86").
The driest month (with the least rainfall) is September (1.65").

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Average rainfall days in September
Niantic, CT

Average rainfall days in September - Niantic, CT
  • Average rainfall days in September: 12 days

The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (9.5 days).

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Average snowfall in September
Niantic, CT

Average snowfall in September - Niantic, CT
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.56").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Niantic, CT

Average snowfall days in September - Niantic, CT
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (6.8 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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Average sea temperature in September
Niantic, CT

Average sea temperature in September - Niantic, CT
  • Average sea temperature in September: 68.2°F

The best month for swimming (with the highest average sea temperature) is August (72.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).

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Average daylight in September /
Average sunshine in September
Niantic, CT

Average daylight in September / Average sunshine in September - Niantic, 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: 9.2h).

  • Average sunshine in September: 8.9h

The month with the most sunshine is August (Average sunshine: 10.6h).
Months with the least sunshine are February and December (Average sunshine: 4.9).

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Average sunshine days in September
Niantic, CT

Average sunshine days in September - Niantic, CT
  • Average sunshine days in September: 15.8 days

The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is February (12.5 days).

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Average UV index in September
Niantic, CT

Average UV index in September - Niantic, 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).

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Average cloud cover in September
Niantic, CT

Average cloud cover in September - Niantic, CT
  • Average cloud cover in September: 33

Months with the most cloud cover are February, March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in September
Niantic, CT

Average visibility in September - Niantic, CT
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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