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's arrival comes with a mild decrease in the average high-temperature, moving subtly from a warm 75.6°F (24.2°C) in August to a pleasant 68.9°F (20.5°C). Alton experiences an average temperature drop to a chilly 47.8°F (8.8°C) during September nights.Humidity
In September, the average relative humidity is 44%.Rainfall
In Alton, in September, during 10.1 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. In Alton, during the entire year, the rain falls for 84.8 days and collects up to 22.05" (560mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, in Alton, there are 66.4 snowfall days, and 75.08" (1907mm) of snow is accumulated.Daylight
In Alton, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 7:01 am and sunset at 7:58 pm. On the last day of September, sunrise is at 7:25 am and sunset at 7:14 pm MDT.
Sunshine
In September, the average sunshine in Alton is 9.6h.UV index
In Alton, Utah, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: An average UV index of 4 in September transforms into this advice:
Make use of precautions - It is urged to ward off sun damage. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Frequently asked questions
What is the temperature in September in Alton?
What is the average humidity in September in Alton?
How many days does it rain in September in Alton?
When does it start to snow in Alton?
What is the average length of the day in September in Alton?
When are sunrise and sunset in September in Alton?
How many hours of sunshine does Alton have in September?
What is the UV index intensity in September in Alton?
Average temperature in September
Alton, UT
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is December (32.9°F).
- Average low temperature in September: 47.8°F
The month with the highest average low temperature is July (55.9°F).
The coldest month (with the lowest average low temperature) is December (17.2°F).
Average pressure in September
Alton, UT
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Alton, UT
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is April (9mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in September
Alton, UT
- Average humidity in September: 44%
The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is June (29%).
Average rainfall in September
Alton, UT
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is July (3.98").
The driest month (with the least rainfall) is June (0.39").
Average rainfall days in September
Alton, UT
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in September
Alton, UT
- Average snowfall in September: 0.04"
The month with the highest snowfall is December (14.06").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Alton, UT
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (12.5 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Alton, UT
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is June (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 48min).
Average sunshine days in September
Alton, UT
- Average sunshine days in September: 17.1 days
The month with the most sunshine days is June (23.4 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in September
Alton, UT
- 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
Alton, UT
- Average cloud cover in September: 13
The months with the most cloud cover are February and December (Cloud cover 38).
The month with the least cloud cover is June (Cloud cover 10).
Average visibility in September
Alton, 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 months with the lowest visibility are January, February and December (5mi).
Alton, Utah, USA
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