September weather forecastVernal, UT
September
Weather in September
September marks the transition from summer to autumn. A decline in temperatures to 74.8°F (23.8°C) for highs and 52.9°F (11.6°C) for lows indicates the start of cooler nights. The fall color palette begins to adorn Vernal, asserting the arrival of fall. September's weather pattern integrates the warmth of the summer days with the coolness of autumn nights, creating a pleasant atmosphere. The equilibrium between day and night temperatures makes this month an exemplar of ideal climatic conditions.Temperature
The average high-temperature shows a slight dip in September, from August's 83.3°F (28.5°C) to a still warm 74.8°F (23.8°C). September presents a pronounced divergence from daily peak temperatures, with the average low-temperature of 52.9°F (11.6°C).Humidity
In September, the average relative humidity is 35%.Rainfall
In Vernal, Utah, in September, during 6.4 rainfall days, 0.43" (11mm) of precipitation is typically accumulated. Throughout the year, there are 83.2 rainfall days, and 5.75" (146mm) of precipitation is accumulated.Snowfall
In Vernal, snow does not fall in June through September.Daylight
In Vernal, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:46 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:01 pm MDT.
Sunshine
In Vernal, the average sunshine in September is 10.9h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: In September, the maximum UV index of 5 suggests these recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Vernal, UT
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (30°F).
- Average low temperature in September: 52.9°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (12.7°F).
Average pressure in September
Vernal, UT
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Vernal, UT
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is June (7.5mph).
The calmest month (with the lowest average wind speed) is January (3.4mph).
Average humidity in September
Vernal, UT
- Average humidity in September: 35%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is June (30%).
Average rainfall in September
Vernal, UT
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is April (0.71").
The driest month (with the least rainfall) is November (0.31").
Average rainfall days in September
Vernal, UT
- Average rainfall days in September: 6.4 days
The month with the highest number of rainy days is April (10.8 days).
The month with the least rainy days is January (5.4 days).
Average snowfall in September
Vernal, UT
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Vernal, UT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Vernal, 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 54min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 30min).
Average sunshine days in September
Vernal, UT
- Average sunshine days in September: 20.7 days
The month with the most sunshine days is October (22.4 days).
The month with the least sunshine days is April (15.3 days).
Average UV index in September
Vernal, UT
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Vernal, UT
- Average cloud cover in September: 11
The month with the most cloud cover is February (Cloud cover 30).
The months with the least cloud cover are August and September (Cloud cover 11).
Average visibility in September
Vernal, 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).
