September weather forecastGrantsville, UT
September
Weather in September
September, the first month of the autumn in Grantsville, is also an agreeable month, with an average temperature fluctuating between 55.4°F (13°C) and 72.7°F (22.6°C).Temperature
In September, the meteorological conditions alter, with the average high-temperature shifting from a moderately hot 81.7°F (27.6°C) in August to an agreeable 72.7°F (22.6°C). In September, the temperature drops to an average of 55.4°F (13°C) at night.Humidity
The average relative humidity in September is 42%.Rainfall
In September, the rain falls for 10.1 days. Throughout September, 1.5" (38mm) of precipitation is accumulated. In Grantsville, Utah, during the entire year, the rain falls for 137.7 days and collects up to 20.98" (533mm) of precipitation.Snowfall
In Grantsville, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 27min.On the first day of September, sunrise is at 6:57 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:12 pm MDT.
Sunshine
The average sunshine in September is 9.7h.UV index
In Grantsville, Utah, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 4 during September leads to these advisories:
Take necessary precautions - Protection from skin and eye injury is mandatory. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grantsville, UT
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in September: 55.4°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).
Average pressure in September
Grantsville, 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 (29.87"Hg).
Average wind speed in September
Grantsville, UT
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is January (6mph).
Average humidity in September
Grantsville, UT
- Average humidity in September: 42%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is July (36%).
Average rainfall in September
Grantsville, UT
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is April (2.52").
The driest month (with the least rainfall) is June (1.1").
Average rainfall days in September
Grantsville, UT
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is April (16.3 days).
The month with the least rainy days is November (7.5 days).
Average snowfall in September
Grantsville, UT
- Average snowfall in September: 0"
The month with the highest snowfall is December (9.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Grantsville, UT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (12.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grantsville, 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: 9h and 42min
The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in September
Grantsville, UT
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is February (10.2 days).
Average UV index in September
Grantsville, UT
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Grantsville, UT
- Average cloud cover in September: 14
The month with the most cloud cover is January (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Grantsville, 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).
