September weather forecast
East Haddam, CT

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Weather in September

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

Temperature

The shift from August to September coincides with a small decrease in the average high-temperature, down to a still warm 73.4°F (23°C) from 80.4°F (26.9°C). Throughout the month of September, East Haddam observes an average nighttime temperature of 56.7°F (13.7°C).

Humidity

In East Haddam, the average relative humidity in September is 77%.

Rainfall

September is the month with the least rainfall. Rain falls for 8.5 days and accumulates 0.39" (10mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in September in East Haddam is 12h and 28min.
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 6:46 am and sunset at 6:32 pm EDT.

Sunshine

The average sunshine in September is 8.3h.

UV index

In September, the average daily maximum UV index in East Haddam is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index, 4 during September, leads to the following recommendations:
Take precautions - Protection against sun damage is advised. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Experience reduced UV exposure by about half when donning a wide-brim hat.
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Frequently asked questions

What is the average September temperature in East Haddam?

The high-temperature in East Haddam, Connecticut, during September is 73.4°F (23°C) and the low-temperature is 56.7°F (13.7°C). The average heat index (a.k.a. 'real feel', 'feels like'), which combines relative humidity and air temperature, in July is appraised at 89.6°F (32°C).

What is the average humidity in September in East Haddam?

In September, the average relative humidity in East Haddam is 77%.

What is the driest month in East Haddam?

September is the month with the least rainfall in East Haddam. Rain falls for 8.5 days and accumulates 0.39" (10mm) of precipitation.

How many days does it rain in September in East Haddam?

In East Haddam, in September, during 8.5 rainfall days, 0.39" (10mm) of precipitation is typically accumulated.

When it does not snow in East Haddam?

In East Haddam, snow does not fall in June through October.

How many hours of daylight does East Haddam have in September?

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

What time are sunrise and sunset in September in East Haddam?

In September, on the first day of the month, sunrise is at 6:16 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:32 pm EDT.

How many hours of sunshine does East Haddam have in September?

The average sunshine duration in September in East Haddam is 8.3h.

What is the UV index intensity in September in East Haddam?

In East Haddam, Connecticut, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health threat 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
East Haddam, CT

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

The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (34.7°F).

  • Average low temperature in September: 56.7°F

The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).

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Average pressure in September
East Haddam, CT

Average pressure in September - East Haddam, 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
East Haddam, CT

Average wind speed in September - East Haddam, CT
  • Average wind speed in September: 6.3mph

The windiest months (with the highest average wind speed) are January and March (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

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Average humidity in September
East Haddam, CT

Average humidity in September - East Haddam, CT
  • Average humidity in September: 77%

The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in September
East Haddam, CT

Average rainfall in September - East Haddam, CT
  • Average rainfall in September: 0.39"

The wettest month (with the highest rainfall) is July (1.18").
The driest month (with the least rainfall) is September (0.39").

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Average rainfall days in September
East Haddam, CT

Average rainfall days in September - East Haddam, CT
  • Average rainfall days in September: 8.5 days

The month with the highest number of rainy days is July (12.7 days).
The month with the least rainy days is January (5.9 days).

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Average snowfall in September
East Haddam, CT

Average snowfall in September - East Haddam, CT
  • Average snowfall in September: 0"

The month with the highest snowfall is March (1.14").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
East Haddam, CT

Average snowfall days in September - East Haddam, CT
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (5.2 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
East Haddam, CT

Average daylight in September / Average sunshine in September - East Haddam, 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 months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

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Average sunshine days in September
East Haddam, CT

Average sunshine days in September - East Haddam, CT
  • Average sunshine days in September: 19.1 days

The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is July (16.3 days).

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Average UV index in September
East Haddam, CT

Average UV index in September - East Haddam, 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).

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Average cloud cover in September
East Haddam, CT

Average cloud cover in September - East Haddam, CT
  • Average cloud cover in September: 39

The months with the most cloud cover are February and March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).

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Average visibility in September
East Haddam, CT

Average visibility in September - East Haddam, 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).

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East Haddam, Connecticut, USA

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