September weather forecastMentor, MN
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Mentor, Minnesota, with temperature in the range of an average low of 50.5°F (10.3°C) and an average high of 68.9°F (20.5°C).Temperature
Mentor's average high-temperature decreases in September, falling from a moderately hot 79°F (26.1°C) in August to a pleasant 68.9°F (20.5°C). The temperature dips to an average of 50.5°F (10.3°C) during September nights.Humidity
The average relative humidity in September is 66%.Rainfall
In Mentor, in September, during 10.1 rainfall days, 1.65" (42mm) of precipitation is typically accumulated. In Mentor, during the entire year, the rain falls for 104 days and collects up to 18.03" (458mm) of precipitation.Snowfall
In Mentor, Minnesota, snow does not fall in June through September.Daylight
In September, the average length of the day in Mentor is 12h and 33min.On the first day of the month, sunrise is at 6:44 am and sunset at 8:04 pm. On the last day of September, sunrise is at 7:23 am and sunset at 7:05 pm CDT.
Sunshine
In Mentor, the average sunshine in September is 8.5h.UV index
In September, the average daily maximum UV index in Mentor is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The daily maximum UV index of 4 in September interprets into the following advice:
Undertake protective steps - Preventing sun damage is advised. When the Sun is at its strongest around midday, find shade and limit exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mentor, MN
- Average high temperature in September: 68.9°F
The warmest months (with the highest average high temperature) are July and August (79°F).
The month with the lowest average high temperature is January (14.4°F).
- Average low temperature in September: 50.5°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 (0°F).
Average pressure in September
Mentor, MN
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Mentor, MN
- Average wind speed in September: 9.4mph
The windiest month (with the highest average wind speed) is October (10.1mph).
The calmest month (with the lowest average wind speed) is July (7.9mph).
Average humidity in September
Mentor, MN
- Average humidity in September: 66%
The months with the highest relative humidity are January and February (93%).
The month with the lowest relative humidity is August (65%).
Average rainfall in September
Mentor, MN
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is June (3.11").
The driest month (with the least rainfall) is February (0.59").
Average rainfall days in September
Mentor, MN
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is June (15.9 days).
The month with the least rainy days is January (1.7 days).
Average snowfall in September
Mentor, MN
- Average snowfall in September: 0"
The month with the highest snowfall is December (5.35").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Mentor, MN
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (15.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Mentor, MN
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in September
Mentor, MN
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is August (19.6 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in September
Mentor, 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
Mentor, MN
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 74).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in September
Mentor, MN
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
