September weather forecastRichfield, UT
September
Weather in September
September in Richfield brings the onset of fall, with temperatures gradually decreasing from summer's highs. The transition from summer to autumn is marked by a notable decrease in rainfall from 1.18" (30mm) in August to 0.71" (18mm). Daylight hours begin to shorten as the days gradually become shorter, and nights take over. The change in season also triggers the beginnings of fall foliage, transforming the landscape into a colorful spectacle. Expect drier conditions and reducing humidity levels, indicating cooler and less muggy days ahead.Temperature
The start of September signals a gentle decrease in the average high-temperature, transitioning from a warm 80.1°F (26.7°C) in August to a pleasant 72.3°F (22.4°C). Richfield, in the heat of September, registers a significant plunge to a mean of 48.7°F (9.3°C) during the nights.Humidity
In Richfield, the average relative humidity in September is 40%.Rainfall
In Richfield, in September, during 8.5 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. Throughout the year, there are 109.4 rainfall days, and 14.21" (361mm) of precipitation is accumulated.Snowfall
Months with snowfall 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 0.16" (4mm) of snow. Throughout the year, there are 53.3 snowfall days, and 41.5" (1054mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:58 am and sunset at 7:58 pm. On the last day of September, sunrise is at 7:24 am and sunset at 7:12 pm MDT.
Sunshine
The average sunshine in September is 9.9h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 4 during September leads to these instructions:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. It's recommended to limit sun exposure when its radiation is at its peak during midday. Opt for tightly woven and loose clothing to enhance protection from the Sun. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Richfield, UT
- Average high temperature in September: 72.3°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The months with the lowest average high temperature are January and December (33.8°F).
- Average low temperature in September: 48.7°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in September
Richfield, UT
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Richfield, UT
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is June (7.3mph).
The calmest month (with the lowest average wind speed) is January (4.8mph).
Average humidity in September
Richfield, UT
- Average humidity in September: 40%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is June (31%).
Average rainfall in September
Richfield, UT
- Average rainfall in September: 0.71"
The wettest months (with the highest rainfall) are March and April (1.81").
The driest month (with the least rainfall) is June (0.51").
Average rainfall days in September
Richfield, UT
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is July (13.4 days).
The month with the least rainy days is November (5.4 days).
Average snowfall in September
Richfield, UT
- Average snowfall in September: 0.16"
The month with the highest snowfall is March (8.35").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Richfield, UT
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (11.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Richfield, UT
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 54min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The months with the least sunshine are January and December (Average sunshine: 6h and 0min).
Average sunshine days in September
Richfield, UT
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is June (22.2 days).
The months with the least sunshine days are February, April and July (13.3 days).
Average UV index in September
Richfield, 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, March, November and December (UV index 2).
Average cloud cover in September
Richfield, UT
- Average cloud cover in September: 10
The months with the most cloud cover are January and December (Cloud cover 36).
The months with the least cloud cover are August and September (Cloud cover 10).
Average visibility in September
Richfield, 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).
