September weather forecast
Colchester, CT

Share

Weather in September

September, the first month of the autumn in Colchester, is also a moderately hot month, with an average temperature ranging between min 56.7°F (13.7°C) and max 73.4°F (23°C).

Temperature

Start of September brings a slight shift in the average high-temperature, dipping a bit from August's 80.2°F (26.8°C) to a still warm 73.4°F (23°C). September in Colchester generally records an average low-temperature of 56.7°F (13.7°C).

Humidity

The average relative humidity in September is 78%.

Rainfall

The month with the least rainfall is September, when the rain falls for 7.5 days and typically collects 0.35" (9mm) of precipitation.

Snowfall

In Colchester, snow does not fall in June through October.

Daylight

In Colchester, Connecticut, the average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:16 am and sunset at 7:22 pm. On the last day of September, in Colchester, sunrise is at 6:45 am and sunset at 6:32 pm EDT.

Sunshine

The average sunshine in September is 8.4h.

UV index

In September, the average daily maximum UV index in Colchester is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily high UV index of 4 during September translates into the following recommendations:
Adopt protective measures - It is advised to guard against sun damage. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Always opt for UVA and UVB-resistant sunglasses on radiant days.
[Resources]

Frequently asked questions

What is the average September temperature in Colchester?

In September, the average high-temperature and low-temperature are 73.4°F (23°C) and 56.7°F (13.7°C) respectively. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in July is estimated at 87.8°F (31°C).

What is the average humidity in September in Colchester?

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

What is the driest month in Colchester?

September is the month with the least rainfall. Rain falls for 7.5 days and accumulates 0.35" (9mm) of precipitation.

How much does it rain in Colchester in September?

In Colchester, in September, during 7.5 rainfall days, 0.35" (9mm) of precipitation is typically accumulated.

When it does not snow in Colchester?

In Colchester, Connecticut, snow does not fall in June through October.

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

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

When is the sunrise / sunset in September in Colchester?

On the first day of September, sunrise is at 6:16 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:32 pm EDT.

How many hours of sunshine does Colchester have in September?

In Colchester, the average sunshine duration in September is 8.4h.

What is the UV index reading in September in Colchester?

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

Average temperature in September
Colchester, CT

Average temperature in September - Colchester, CT
  • Average high temperature in September: 73.4°F

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (34.3°F).

  • Average low temperature in September: 56.7°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).

[Resources]

Average pressure in September
Colchester, CT

Average pressure in September - Colchester, 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).

[Resources]

Average wind speed in September
Colchester, CT

Average wind speed in September - Colchester, CT
  • Average wind speed in September: 6.2mph

The windiest months (with the highest average wind speed) are January and March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

[Resources]

Average humidity in September
Colchester, CT

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

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (71%).

[Resources]

Average rainfall in September
Colchester, CT

Average rainfall in September - Colchester, CT
  • Average rainfall in September: 0.35"

The wettest month (with the highest rainfall) is December (1.02").
The driest month (with the least rainfall) is September (0.35").

[Resources]

Average rainfall days in September
Colchester, CT

Average rainfall days in September - Colchester, CT
  • Average rainfall days in September: 7.5 days

The month with the highest number of rainy days is July (11.8 days).
The month with the least rainy days is January (5.1 days).

[Resources]

Average snowfall in September
Colchester, CT

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

The month with the highest snowfall is March (1.26").
The months with the least snowfall are June, July, August, September and October (0").

[Resources]

Average snowfall days in September
Colchester, CT

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

The month with the highest number of snowfall days is February (6.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

[Resources]

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

Average daylight in September / Average sunshine in September - Colchester, CT
  • Average daylight in September: 12h and 3min

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 2min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The months with the least sunshine are February and December (Average sunshine: 4h and 36min).

[Resources]

Average sunshine days in September
Colchester, CT

Average sunshine days in September - Colchester, CT
  • Average sunshine days in September: 20.5 days

The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is July (17.1 days).

[Resources]

Average UV index in September
Colchester, CT

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

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

[Resources]

Average cloud cover in September
Colchester, CT

Average cloud cover in September - Colchester, CT
  • Average cloud cover in September: 38

The months with the most cloud cover are February and March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).

[Resources]

Average visibility in September
Colchester, CT

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

The months with the highest visibility are January, March, April, September, October, November and December (6mi).
The months with the lowest visibility are February, May, June, July and August (5mi).

[Resources]

Colchester, Connecticut, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location