September weather forecastAltonah, UT
September
Weather in September
September, the first month of the autumn in Altonah, is still a comfortable month, with an average temperature ranging between max 63.1°F (17.3°C) and min 40.8°F (4.9°C).Temperature
The average high-temperature slightly decreases in September, shifting from a pleasant 70.5°F (21.4°C) in August to an enjoyable 63.1°F (17.3°C). Altonah observes a substantial disparity between daytime high and the average low-temperature of 40.8°F (4.9°C) during September nights.Humidity
In September, the average relative humidity is 48%.Rainfall
In Altonah, during September, the rain falls for 7.5 days and regularly aggregates up to 0.63" (16mm) of precipitation. In Altonah, during the entire year, the rain falls for 98.4 days and collects up to 11.54" (293mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 1.4 snowfall days, it receives 0.43" (11mm) of snow. In Altonah, during the entire year, snow falls for 87 days and aggregates up to 51.73" (1314mm) of snow.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:49 am and sunset at 7:52 pm. On the last day of September, sunrise is at 7:17 am and sunset at 7:04 pm MDT.
Sunshine
The average sunshine in September is 10.4h.UV index
In Altonah, Utah, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: An average UV index of 3 in September transforms into this advice:
Guard yourself - Avoiding sunburn is suggested. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Altonah, UT
- Average high temperature in September: 63.1°F
The warmest month (with the highest average high temperature) is July (73°F).
The month with the lowest average high temperature is December (25.7°F).
- Average low temperature in September: 40.8°F
The month with the highest average low temperature is July (48.7°F).
The coldest month (with the lowest average low temperature) is January (8.6°F).
Average pressure in September
Altonah, UT
- Average pressure in September: 29.96"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
Altonah, UT
- Average wind speed in September: 6.1mph
The windiest month (with the highest average wind speed) is June (7.9mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in September
Altonah, UT
- Average humidity in September: 48%
The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are June and July (44%).
Average rainfall in September
Altonah, UT
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Altonah, UT
- Average rainfall days in September: 7.5 days
The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is November (3.4 days).
Average snowfall in September
Altonah, UT
- Average snowfall in September: 0.43"
The month with the highest snowfall is March (10.24").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Altonah, UT
- Average snowfall days in September: 1.4 days
The month with the highest number of snowfall days is March (13.1 days).
The month with the least snowfall days is July (0 days).
Average daylight in September /
Average sunshine in September
Altonah, UT
- Average daylight in September: 12h and 24min
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 24min
The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 6h and 12min).
Average sunshine days in September
Altonah, UT
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is July (10.9 days).
Average UV index in September
Altonah, UT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Altonah, UT
- Average cloud cover in September: 13
The month with the most cloud cover is February (Cloud cover 38).
The month with the least cloud cover is September (Cloud cover 13).
Average visibility in September
Altonah, UT
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
