September weather forecast
Mystic, CT

Weather in September

September, the first month of the autumn in Mystic, is also an agreeable month, with an average temperature ranging between min 59.9°F (15.5°C) and max 71.4°F (21.9°C).

Temperature

In September, the average high-temperature marginally drops from a moderately hot 77.7°F (25.4°C) in August to an agreeable 71.4°F (21.9°C). In September, in Mystic, the average low-temperature is 59.9°F (15.5°C).

Humidity

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

Rainfall

The month with the least rainfall in Mystic, Connecticut, is September, when the rain falls for 12.8 days and typically collects 1.73" (44mm) of precipitation.

Snowfall

May through September are months without snowfall.

Ocean temperature

In Mystic, the average seawater temperature in September is 67.6°F (19.8°C).
Note: For most, swimming in 67.6°F (19.8°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

The average length of the day in September is 12h and 28min.
On the first day of September in Mystic, sunrise is at 6:14 am and sunset at 7:21 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:31 pm EDT.

Sunshine

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

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. 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 the 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 temperature in September in Mystic?

In September, in Mystic, the average high-temperature is 71.4°F (21.9°C), and the average low-temperature is 59.9°F (15.5°C).

What is the average humidity in September in Mystic?

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

What is the driest month in Mystic?

September is the month with the least rainfall in Mystic. Rain falls for 12.8 days and accumulates 1.73" (44mm) of precipitation.

How much does it rain in Mystic in September?

In Mystic, in September, during 12.8 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

When it does not snow in Mystic?

May through September are months without snowfall.

Does it snow in Mystic in September?

In Mystic, Connecticut, in September, it doesn't snow. In October, it regularly snows.

How cold is the water in September in Mystic?

In September, the average ocean temperature in Mystic, Connecticut, is 67.6°F (19.8°C). For most, swimming in 67.6°F (19.8°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 Mystic?

In September, the average day length in Mystic, Connecticut, is 12h and 28min.

When are sunrise and sunset in September in Mystic?

In September, on the first day of the month, sunrise is at 6:14 am and sunset at 7:21 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:31 pm EDT.

How long on average sun shines in September in Mystic?

In Mystic, the average sunshine duration in September is 8.9h.

What is the UV index reading in September in Mystic?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Mystic, CT

Average temperature in September - Mystic, CT
  • Average high temperature in September: 71.4°F

The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (36.5°F).

  • Average low temperature in September: 59.9°F

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).

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Average pressure in September
Mystic, CT

Average pressure in September - Mystic, CT
  • Average pressure in September: 30.05"Hg

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

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Average wind speed in September
Mystic, CT

Average wind speed in September - Mystic, CT
  • Average wind speed in September: 9.2mph

The windiest month (with the highest average wind speed) is January (12.4mph).
The calmest month (with the lowest average wind speed) is August (8.1mph).

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Average humidity in September
Mystic, CT

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

The month with the highest relative humidity is June (81%).
The months with the lowest relative humidity are January, March, April and November (74%).

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Average rainfall in September
Mystic, CT

Average rainfall in September - Mystic, CT
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is December (3.86").
The driest month (with the least rainfall) is September (1.73").

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Average rainfall days in September
Mystic, CT

Average rainfall days in September - Mystic, CT
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is February (10.1 days).

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Average snowfall in September
Mystic, CT

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

The month with the highest snowfall is March (2.44").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Mystic, CT

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

The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in September
Mystic, CT

Average sea temperature in September - Mystic, CT
  • Average sea temperature in September: 67.6°F

The best month for swimming (with the highest average sea temperature) is August (70.3°F).
The coldest month (with the lowest average sea temperature) is February (37.9°F).

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

Average daylight in September / Average sunshine in September - Mystic, CT
  • Average daylight in September: 12h and 28min

The month with the longest days is June (Average daylight: 15h and 7min).
The month with the shortest days is December (Average daylight: 9h and 15min).

  • Average sunshine in September: 8h and 54min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).

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Average sunshine days in September
Mystic, CT

Average sunshine days in September - Mystic, CT
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is November (16.5 days).
The months with the least sunshine days are June and July (11.7 days).

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Average UV index in September
Mystic, CT

Average UV index in September - Mystic, 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 and December (UV index 2).

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Average cloud cover in September
Mystic, CT

Average cloud cover in September - Mystic, CT
  • Average cloud cover in September: 32

The 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 28).

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Average visibility in September
Mystic, CT

Average visibility in September - Mystic, 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).

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