September weather forecastRiverton, MN
September
Weather in September
September, the first month of the autumn in Riverton, is also an agreeable month, with an average temperature varying between 49.1°F (9.5°C) and 69.3°F (20.7°C).Temperature
Welcoming September, Riverton observes a shift in the average high-temperature, falling from August's warm 78.4°F (25.8°C) to a pleasant 69.3°F (20.7°C). Throughout the nights in September, an average low-temperature of 49.1°F (9.5°C) is noted in Riverton.Humidity
In September, the average relative humidity is 74%.Rainfall
In Riverton, during September, the rain falls for 10.1 days and regularly aggregates up to 1.26" (32mm) of precipitation. Throughout the year, there are 108 rainfall days, and 19.88" (505mm) of precipitation is accumulated.Snowfall
In Riverton, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 6:37 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 6:57 pm CDT.
Sunshine
The average sunshine in September is 8.3h.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 radiation for the ordinary person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Make use of precautions - It is urged to ward off sun damage. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Riverton, MN
- Average high temperature in September: 69.3°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (17.6°F).
- Average low temperature in September: 49.1°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (3.6°F).
Average pressure in September
Riverton, MN
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Riverton, MN
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Riverton, MN
- Average humidity in September: 74%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is May (70%).
Average rainfall in September
Riverton, MN
- Average rainfall in September: 1.26"
The wettest month (with the highest rainfall) is June (3.11").
The driest month (with the least rainfall) is January (0.71").
Average rainfall days in September
Riverton, MN
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is June (15.3 days).
The months with the least rainy days are January and February (2.2 days).
Average snowfall in September
Riverton, MN
- Average snowfall in September: 0"
The month with the highest snowfall is December (8.58").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Riverton, MN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (20.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Riverton, MN
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in September
Riverton, MN
- Average sunshine days in September: 17.6 days
The month with the most sunshine days is September (17.6 days).
The month with the least sunshine days is February (10.1 days).
Average UV index in September
Riverton, MN
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Riverton, MN
- Average cloud cover in September: 40
The month with the most cloud cover is January (Cloud cover 76).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in September
Riverton, MN
- Average visibility in September: 5mi
The months with the highest visibility are May, June and October (6mi).
The months with the lowest visibility are January, February, March and December (4mi).
