Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from 80.4°F (26.9°C) to a still warm 73.4°F (23°C). An average temperature of 56.7°F (13.7°C) is recorded during the nights in September.Humidity
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, snow does not fall in June through October.Daylight
In East Haddam, 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, sunrise is at 6:46 am and sunset at 6:32 pm EDT.
Sunshine
In September, the average sunshine is 8.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 4 during September translates into the following guidance:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does East Haddam have in September?
When are sunrise and sunset in September?
How many hours of sunshine does East Haddam have in September?
What is the UV index reading in September?
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).
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).
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).
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%).
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").
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).
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").
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).
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).
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).
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).
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).
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).
East Haddam, Connecticut, USA
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