September weather forecastClinton, UT
September
Weather in September
The arrival of September signals the onset of autumn in Clinton, Utah, with temperatures gradually dipping. Although the average high sits at 72.5°F (22.5°C), a stark contrast to August's 81.1°F (27.3°C), sunny days prevail with an extended 12.5 hours of daylight. With pleasant weather and moderate temperatures, September provides numerous opportunities for outdoor activities. As the city transitions from September to October, the weather sets the stage for the vibrant fall foliage typical of autumn in Clinton.Temperature
September's onset introduces a mild reduction in the average high-temperature, from a moderately hot 81.1°F (27.3°C) in August to a pleasant 72.5°F (22.5°C). An average low-temperature of 52.7°F (11.5°C) is anticipated throughout the nights during September.Humidity
In September, the average relative humidity is 44%.Rainfall
In Clinton, in September, during 7.3 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. In Clinton, during the entire year, the rain falls for 98.9 days and collects up to 13.58" (345mm) of precipitation.Snowfall
Months with snowfall in Clinton, Utah, are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.31" (8mm) of snow. In Clinton, during the entire year, snow falls for 54.4 days and aggregates up to 44.84" (1139mm) of snow.Daylight
In September, the average length of the day is 12h and 27min.On the first day of September in Clinton, sunrise is at 6:55 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:11 pm MDT.
Sunshine
In September, the average sunshine is 9.9h.UV index
In Clinton, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Ensure safety - Sun damage prevention is strongly urged. Around midday, solar radiation is most harmful; hence, exposure should be limited. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Clinton, UT
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).
Average pressure in September
Clinton, UT
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Clinton, UT
- Average wind speed in September: 5.9mph
The windiest months (with the highest average wind speed) are March and April (6.5mph).
The calmest month (with the lowest average wind speed) is January (5mph).
Average humidity in September
Clinton, UT
- Average humidity in September: 44%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is July (38%).
Average rainfall in September
Clinton, UT
- Average rainfall in September: 0.91"
The wettest months (with the highest rainfall) are January and February (1.61").
The driest months (with the least rainfall) are July and August (0.43").
Average rainfall days in September
Clinton, UT
- Average rainfall days in September: 7.3 days
The month with the highest number of rainy days is April (12.3 days).
The month with the least rainy days is January (5.5 days).
Average snowfall in September
Clinton, UT
- Average snowfall in September: 0.31"
The month with the highest snowfall is January (11.02").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Clinton, UT
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (12 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Clinton, UT
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 54min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in September
Clinton, UT
- Average sunshine days in September: 19.1 days
The month with the most sunshine days is October (21.5 days).
The month with the least sunshine days is February (12.7 days).
Average UV index in September
Clinton, UT
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Clinton, UT
- Average cloud cover in September: 13
The month with the most cloud cover is January (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 10).
Average visibility in September
Clinton, UT
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
