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 transition into September subtly indicates a reduction in the average high-temperature, down to an agreeable 72°F (22.2°C) from August's moderately hot 79°F (26.1°C). In September, Union encounters an average low-temperature of 53.6°F (12°C) during the night.Humidity
In September, the average relative humidity is 79%.Rainfall
September is the month with the least rainfall in Union. Rain falls for 12.6 days and accumulates 1.65" (42mm) of precipitation.Snowfall
In Union, Connecticut, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:15 am and sunset at 7:21 pm. On the last day of September, in Union, sunrise is at 6:45 am and sunset at 6:31 pm EDT.
Sunshine
In Union, the average sunshine in September is 8h.UV index
In Union, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: A typical high UV index of 4 in September suggests the following recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Union in September?
What is the average humidity in September in Union?
What is the driest month in Union?
How many days does it rain in September in Union?
When it does not snow in Union?
Does it snow in Union in September?
How many hours of daylight does Union have in September?
When are sunrise and sunset in September in Union?
How many hours of sunshine does Union have in September?
What is the UV index reading in September in Union?
Average temperature in September
Union, CT
- Average high temperature in September: 72°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (31.3°F).
- Average low temperature in September: 53.6°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (19°F).
Average pressure in September
Union, CT
- Average pressure in September: 30.06"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
Union, CT
- Average wind speed in September: 6mph
The windiest months (with the highest average wind speed) are January and February (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Union, CT
- Average humidity in September: 79%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (73%).
Average rainfall in September
Union, CT
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is July (2.76").
The driest month (with the least rainfall) is September (1.65").
Average rainfall days in September
Union, CT
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is January (7.1 days).
Average snowfall in September
Union, CT
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.88").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Union, CT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Union, CT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in September
Union, CT
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is June (13.1 days).
Average UV index in September
Union, CT
- Average UV index in September: 4
The months with the highest UV index are June and July (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
Union, CT
- Average cloud cover in September: 42
The month with the most cloud cover is March (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in September
Union, CT
- Average visibility in September: 5mi
The months with the highest visibility are March, April, November and December (6mi).
The months with the lowest visibility are January, February, May, June, July, August, September and October (5mi).
Union, Connecticut, USA
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