September weather forecastAmerican Fork, UT
September
Weather in September
Weather in September in American Fork introduces the first hints of the impending fall season. There is a significant drop in temperature from August's high, and autumnal color starts to paint the city’s landscape. September's weather is known to be changeable, offering both the last warm summer days and the initial fresh autumn chills. Rainfall increases slightly to 0.98" (25mm). Despite the cooler temperature, the sun continues to shine brightly, illuminating the gradual changing of the leaves.Temperature
The start of September involves a subtle temperature drop, shifting from 82.9°F (28.3°C) in August to a still moderately hot 74.1°F (23.4°C). Contrasting the daytime warmth, American Fork's September nights cool down to an average of 48.9°F (9.4°C).Humidity
In American Fork, the average relative humidity in September is 43%.Rainfall
In September, the rain falls for 9.7 days. Throughout September, 0.98" (25mm) of precipitation is accumulated. In American Fork, during the entire year, the rain falls for 123.2 days and collects up to 16.73" (425mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:55 am and sunset at 7:58 pm. On the last day of September, sunrise is at 7:23 am and sunset at 7:10 pm MDT.
Sunshine
In American Fork, the average sunshine in September is 10h.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 rays for average individuals.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Take precautions - Protection against sun damage is advised. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
American Fork, UT
- Average high temperature in September: 74.1°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The months with the lowest average high temperature are January and December (32.4°F).
- Average low temperature in September: 48.9°F
The month with the highest average low temperature is July (58.1°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).
Average pressure in September
American Fork, 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 (29.86"Hg).
Average wind speed in September
American Fork, UT
- Average wind speed in September: 5.6mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is January (4.6mph).
Average humidity in September
American Fork, UT
- Average humidity in September: 43%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is July (38%).
Average rainfall in September
American Fork, UT
- Average rainfall in September: 0.98"
The wettest months (with the highest rainfall) are April and December (1.93").
The driest month (with the least rainfall) is June (0.75").
Average rainfall days in September
American Fork, UT
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is May (14.3 days).
The months with the least rainy days are June and November (7.3 days).
Average snowfall in September
American Fork, UT
- Average snowfall in September: 0"
The month with the highest snowfall is January (11.06").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
American Fork, UT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
American Fork, 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 0min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in September
American Fork, UT
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is February (11.4 days).
Average UV index in September
American Fork, 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
American Fork, UT
- Average cloud cover in September: 12
The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 10).
Average visibility in September
American Fork, 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).
