September weather forecastAlton, UT
September
Weather in September
As Alton steps into September, it begins to shrug off its summer attire and prepares for the gentler embraces of Fall. Following August, the recorded temperatures show a slight drop, and the meteorological data presents a rainfall of 1.73" (44mm). Outdoor enthusiasts can enjoy the ideal weather that comes with this season. As the month progresses, residents find comfort in the cooler breezes and beautiful autumn hues. September, therefore, ushers in an aesthetic transition as it blends the receding heat with incoming nippy winds.Temperature
During the shift to September, Alton records a mild decrease in average high-temperature, moving from a moderately hot 75.6°F (24.2°C) in August to a pleasant 68.9°F (20.5°C). Throughout September nights, Alton experiences a consistent temperature average of 47.8°F (8.8°C).Humidity
In September, the average relative humidity is 44%.Rainfall
In Alton, during September, the rain falls for 10.1 days and regularly aggregates up to 1.73" (44mm) of precipitation. 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. In Alton, during the entire year, snow falls for 66.4 days and aggregates up to 75.08" (1907mm) of snow.Daylight
The average length of the day in September in Alton 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 Alton, the average sunshine in September is 9.6h.UV index
In September, the average daily maximum UV index in Alton is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index of 4 during September translates into these guidelines:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Opt for tightly woven and loose clothing to enhance protection from the Sun. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 24min
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 36min
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).
