Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September is marked by a subtle drop in average high-temperatures, transitioning from a moderately hot 77.4°F (25.2°C) in August to an agreeable 71.1°F (21.7°C). Throughout September nights, Monona experiences a consistent temperature average of 52°F (11.1°C).Humidity
In September, the average relative humidity is 81%.Rainfall
In Monona, in September, it is raining for 3.5 days, with typically 0.43" (11mm) of accumulated precipitation. Throughout the year, in Monona, there are 50.2 rainfall days, and 4.76" (121mm) of precipitation is accumulated.Snowfall
In Monona, snow does not fall in May through September.Daylight
In Monona, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:22 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 6:39 pm CDT.
Sunshine
In Monona, the average sunshine in September is 8.6h.UV index
In Monona, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The daily high UV index of 3 during September translates into the following recommendations:
Undertake protective steps - Preventing sun damage is advised. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Frequently asked questions
What are September temperatures in Monona?
What is the average humidity in September in Monona?
How many days does it rain in September in Monona?
When it does not snow in Monona?
Does it snow in Monona in September?
How many hours of daylight does Monona have in September?
When are sunrise and sunset in September in Monona?
How many hours of sunshine does Monona have in September?
What is the UV index reading in September in Monona?
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 3min
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 4min
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).
Monona, Wisconsin, USA
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