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
With September's onset, the weather reveals a slight temperature decrease, transitioning from 82°F (27.8°C) in August to a still moderately hot 73.4°F (23°C). Following the sharp contrast to daytime warmth, an average nighttime temperature of 50.9°F (10.5°C) gets registered during September.Humidity
The average relative humidity in September in Union is 43%.Rainfall
In Union, in September, during 8 rainfall days, 0.94" (24mm) of precipitation is typically accumulated. Throughout the year, there are 110.7 rainfall days, and 16.06" (408mm) of precipitation is accumulated.Snowfall
In Union, snow does not fall in June through September.Daylight
In Union, Utah, the average length of the day in September is 12h and 27min.On the first day of September in Union, sunrise is at 6:55 am and sunset at 7:59 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:10 pm MDT.
Sunshine
In Union, the average sunshine in September is 10h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: A typical high UV index of 4 in September suggests the following recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. The solar radiation around mid-day is intense; avoid the Sun and stay safe. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Frequently asked questions
What is the usual temperature for Union in September?
What is the average humidity in September 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?
What time are sunrise and sunset in September in Union?
How many hours of sunshine does Union have in September?
What is the UV index intensity in September in Union?
Average temperature in September
Union, UT
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in September
Union, UT
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Union, UT
- Average wind speed in September: 5.7mph
The windiest months (with the highest average wind speed) are March and April (6.3mph).
The calmest month (with the lowest average wind speed) is January (4.8mph).
Average humidity in September
Union, UT
- Average humidity in September: 43%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (37%).
Average rainfall in September
Union, UT
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is March (1.97").
The driest month (with the least rainfall) is June (0.59").
Average rainfall days in September
Union, UT
- Average rainfall days in September: 8 days
The month with the highest number of rainy days is March (13.2 days).
The month with the least rainy days is June (6.3 days).
Average snowfall in September
Union, UT
- Average snowfall in September: 0"
The month with the highest snowfall is January (10.71").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Union, UT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.1 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, UT
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 10h and 0min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in September
Union, UT
- Average sunshine days in September: 18.7 days
The month with the most sunshine days is June (21.4 days).
The month with the least sunshine days is February (12.9 days).
Average UV index in September
Union, UT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Union, UT
- Average cloud cover in September: 12
The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 10).
Average visibility in September
Union, UT
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Union, Utah, USA
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