September weather forecastGreendale, WI
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Greendale, Wisconsin, with an average temperature ranging between max 70.9°F (21.6°C) and min 56.5°F (13.6°C).Temperature
As Greendale enters September, the average high-temperature subtly lowers from the a moderately hot 77.4°F (25.2°C) of August to a pleasant 70.9°F (21.6°C). Throughout September, Greendale witnesses a consistent average low-temperature of 56.5°F (13.6°C).Humidity
In September, the average relative humidity is 77%.Rainfall
In Greendale, in September, it is raining for 12.1 days, with typically 1.57" (40mm) of accumulated precipitation. In Greendale, during the entire year, the rain falls for 129 days and collects up to 20.35" (517mm) of precipitation.Snowfall
In Greendale, Wisconsin, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:34 pm CDT.
Sunshine
The average sunshine in September in Greendale is 9.1h.UV index
In September, the average daily maximum UV index in Greendale, Wisconsin, is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: A daily high UV index of 4 in September leads to these guidelines:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Greendale, WI
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in September: 56.5°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (16°F).
Average pressure in September
Greendale, WI
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Greendale, WI
- Average wind speed in September: 8.2mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
Greendale, WI
- Average humidity in September: 77%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Greendale, WI
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is July (2.6").
The driest month (with the least rainfall) is December (0.79").
Average rainfall days in September
Greendale, WI
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is February (3.2 days).
Average snowfall in September
Greendale, WI
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.23").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Greendale, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Greendale, 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: 9h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Greendale, WI
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is July (11.4 days).
Average UV index in September
Greendale, WI
- 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 and December (UV index 1).
Average cloud cover in September
Greendale, WI
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 29).
Average visibility in September
Greendale, WI
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
