September weather forecastDelavan Lake, WI
September
Weather in September
September, the first month of the autumn in Delavan Lake, is also an agreeable month, with an average temperature fluctuating between 71.8°F (22.1°C) and 52.9°F (11.6°C).Temperature
Delavan Lake's weather subtly changes with the onset of September, barely falling from a moderately hot 77.5°F (25.3°C) in August to a pleasant 71.8°F (22.1°C). The average temperature in Delavan Lake drops to a cool 52.9°F (11.6°C) during the night in the month of September.Humidity
In Delavan Lake, the average relative humidity in September is 81%.Rainfall
In Delavan Lake, in September, during 11.4 rainfall days, 1.26" (32mm) of precipitation is typically accumulated. In Delavan Lake, Wisconsin, during the entire year, the rain falls for 132.3 days and collects up to 18.7" (475mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In Delavan Lake, Wisconsin, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:20 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:37 pm CDT.
Sunshine
The average sunshine in September is 8.5h.UV index
In Delavan Lake, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 4 translates into these guidelines:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Delavan Lake, WI
- Average high temperature in September: 71.8°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (24.8°F).
- Average low temperature in September: 52.9°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (12.9°F).
Average pressure in September
Delavan Lake, WI
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Delavan Lake, WI
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
Delavan Lake, WI
- Average humidity in September: 81%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (77%).
Average rainfall in September
Delavan Lake, WI
- Average rainfall in September: 1.26"
The wettest month (with the highest rainfall) is July (2.56").
The driest months (with the least rainfall) are January and December (0.79").
Average rainfall days in September
Delavan Lake, WI
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is July (17.4 days).
The months with the least rainy days are January and February (3.8 days).
Average snowfall in September
Delavan Lake, WI
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.35").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Delavan Lake, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Delavan Lake, 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 30min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Delavan Lake, WI
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in September
Delavan Lake, WI
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Delavan Lake, WI
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 64).
The months with the least cloud cover are July, August and September (Cloud cover 35).
Average visibility in September
Delavan Lake, WI
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
