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
September signals a slight drop in average high-temperature, sliding from August's pleasant 70.7°F (21.5°C) to a refreshing 64.9°F (18.3°C). In Union, the expected average low-temperature for September is a cool 54°F (12.2°C).Humidity
In September, the average relative humidity is 81%.Rainfall
September is the month with the least rainfall. Rain falls for 8.3 days and accumulates 0.75" (19mm) of precipitation.Snowfall
In Union, Maine, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 30min.On the first day of September, sunrise is at 6:01 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:34 am and sunset at 6:19 pm EDT.
Sunshine
The average sunshine in September in Union is 8.5h.UV index
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 the ordinary person.Note: During September, 4 as the daily maximum UV index converts into the following advice:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
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?
How many hours of daylight does Union have in September?
When is the sunrise / sunset in September in Union?
How many hours of sunshine does Union have in September?
How high is the UV index in September in Union?
Average temperature in September
Union, ME
- Average high temperature in September: 64.9°F
The warmest month (with the highest average high temperature) is August (70.7°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in September: 54°F
The months with the highest average low temperature are July and August (59.4°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).
Average pressure in September
Union, ME
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is September (30.04"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Union, ME
- Average wind speed in September: 8.5mph
The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.2mph).
Average humidity in September
Union, ME
- Average humidity in September: 81%
The months with the highest relative humidity are June and July (84%).
The month with the lowest relative humidity is November (76%).
Average rainfall in September
Union, ME
- Average rainfall in September: 0.75"
The wettest months (with the highest rainfall) are April, November and December (1.42").
The driest month (with the least rainfall) is September (0.75").
Average rainfall days in September
Union, ME
- Average rainfall days in September: 8.3 days
The month with the highest number of rainy days is April (13.2 days).
The months with the least rainy days are January and February (6.8 days).
Average snowfall in September
Union, ME
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Union, ME
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Union, ME
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in September
Union, ME
- Average sunshine days in September: 19.9 days
The month with the most sunshine days is September (19.9 days).
The month with the least sunshine days is April (13.8 days).
Average UV index in September
Union, ME
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Union, ME
- Average cloud cover in September: 32
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Union, ME
- 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).
Union, Maine, USA
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