September weather forecastMonona, WI
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Monona, Wisconsin, with an average temperature fluctuating between 71.1°F (21.7°C) and 52°F (11.1°C).Temperature
The arrival of September signals a subtle shift in temperature, down from a moderately hot 77.4°F (25.2°C) in August to a pleasant 71.1°F (21.7°C). Monona sees an average low-temperature of 52°F (11.1°C) during September.Humidity
In Monona, the average relative humidity in September is 81%.Rainfall
In September, the rain falls for 3.5 days. Throughout September, 0.43" (11mm) of precipitation is accumulated. Throughout the year, there are 50.2 rainfall days, and 4.76" (121mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In Monona, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:31 pm. On the last day of September, in Monona, sunrise is at 6:54 am and sunset at 6:39 pm CDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 3 suggests this advice:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Monona, WI
- Average high temperature in September: 71.1°F
The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (23.9°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).
Average pressure in September
Monona, WI
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are January and February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Monona, WI
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is April (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in September
Monona, WI
- Average humidity in September: 81%
The months with the highest relative humidity are January and February (88%).
The months with the lowest relative humidity are April and October (77%).
Average rainfall in September
Monona, WI
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is July (0.63").
The driest months (with the least rainfall) are January, March, November and December (0.24").
Average rainfall days in September
Monona, WI
- Average rainfall days in September: 3.5 days
The month with the highest number of rainy days is June (6.7 days).
The month with the least rainy days is January (1.1 days).
Average snowfall in September
Monona, WI
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.94").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Monona, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Monona, WI
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in September
Monona, WI
- Average sunshine days in September: 23.8 days
The month with the most sunshine days is December (27 days).
The month with the least sunshine days is June (19.8 days).
Average UV index in September
Monona, WI
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in September
Monona, WI
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Monona, WI
- Average visibility in September: 5mi
The months with the highest visibility are February, March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, July, August and September (5mi).
