September weather forecastMinnetonka, MN
September
Weather in September
September rings the changing bells, signaling the impending turn in the weather as autumn approaches. The temperatures follow a downward trajectory, and humidity decreases, providing relief from the summer's heat, but rainfall still lingers high at 0.98" (25mm). Daylight hours start to shrink, hinting at the coming winter months. Despite these shifts, the weather remains congenial for outdoor activities, marking a sweet spot between the stifling summer and upcoming cold months.Temperature
A moderate decline in average high-temperatures is noted in September, moving from a moderately hot 78.4°F (25.8°C) in August to an agreeable 71.4°F (21.9°C). Minnetonka observes an average low-temperature of 53.6°F (12°C) during September.Humidity
The average relative humidity in September is 74%.Rainfall
In September, the rain falls for 9.9 days. Throughout September, 0.98" (25mm) of precipitation is accumulated. In Minnetonka, during the entire year, the rain falls for 103.9 days and collects up to 12.4" (315mm) of precipitation.Snowfall
In Minnetonka, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 31min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:11 am and sunset at 6:55 pm CDT.
Sunshine
In Minnetonka, the average sunshine in September is 8.7h.UV index
The average daily maximum UV index in September in Minnetonka is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: In September, an average UV index of 4 transforms into the following instructions:
Be vigilant - Preventing sunburn is recommended. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Minnetonka, MN
- Average high temperature in September: 71.4°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (20.5°F).
- Average low temperature in September: 53.6°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (7.5°F).
Average pressure in September
Minnetonka, MN
- Average pressure in September: 30"Hg
The months with the highest atmospheric pressure are January and February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Minnetonka, MN
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is April (9.2mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in September
Minnetonka, MN
- Average humidity in September: 74%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are April, May and October (71%).
Average rainfall in September
Minnetonka, MN
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is June (2.13").
The driest month (with the least rainfall) is January (0.35").
Average rainfall days in September
Minnetonka, MN
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is June (15.5 days).
The month with the least rainy days is February (1.5 days).
Average snowfall in September
Minnetonka, MN
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.64").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Minnetonka, MN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Minnetonka, MN
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Minnetonka, MN
- Average sunshine days in September: 17.4 days
The months with the most sunshine days are October and November (20.4 days).
The month with the least sunshine days is June (12.1 days).
Average UV index in September
Minnetonka, MN
- 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, November and December (UV index 1).
Average cloud cover in September
Minnetonka, MN
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 68).
The months with the least cloud cover are July and August (Cloud cover 31).
Average visibility in September
Minnetonka, MN
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
