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 onset of September entails a subtle temperature shift, as the average high-temperature eases from a warm 79.2°F (26.2°C) in August to an agreeable 72.5°F (22.5°C). In the month of September, the average temperature dips to a mild 58.1°F (14.5°C) during the night.Humidity
The average relative humidity in September in Old Mystic is 78%.Rainfall
September is the month with the least rainfall in Old Mystic. Rain falls for 12.1 days and accumulates 1.61" (41mm) of precipitation.Snowfall
In Old Mystic, Connecticut, snow does not fall in June through October.Daylight
The average length of the day in September is 12h and 28min.On the first day of September in Old Mystic, sunrise is at 6:14 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:30 pm EDT.
Sunshine
In Old Mystic, the average sunshine in September is 8.5h.UV index
In Old Mystic, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
What are September temperatures in Old Mystic?
What is the average humidity in September in Old Mystic?
What is the driest month in Old Mystic?
How much does it rain in Old Mystic in September?
When it does not snow in Old Mystic?
How many hours of daylight does Old Mystic have in September?
When are sunrise and sunset in September in Old Mystic?
How many hours of sunshine does Old Mystic have in September?
What is the UV index intensity in September in Old Mystic?
Average temperature in September
Old Mystic, CT
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in September
Old 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).
Average wind speed in September
Old Mystic, CT
- Average wind speed in September: 7.7mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in September
Old Mystic, CT
- Average humidity in September: 78%
The months with the highest relative humidity are June and July (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall in September
Old Mystic, CT
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is December (3.78").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in September
Old Mystic, CT
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is June (16.6 days).
The month with the least rainy days is January (10 days).
Average snowfall in September
Old Mystic, CT
- Average snowfall in September: 0"
The month with the highest snowfall is March (2.56").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Old Mystic, CT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7 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
Old Mystic, 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 3min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days in September
Old Mystic, CT
- Average sunshine days in September: 15.4 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is July (11.5 days).
Average UV index in September
Old 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, November and December (UV index 2).
Average cloud cover in September
Old Mystic, CT
- Average cloud cover in September: 35
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Old 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).
Old Mystic, Connecticut, USA
Weather forecast for your location
2. Allow the app to use your location
