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
The onset of September is marked by a minor decrease in temperature, transitioning from a moderately hot 74.7°F (23.7°C) in August to a comfortable 66.7°F (19.3°C). In Mellen, the average temperature during the nights of September drops to a cool 50°F (10°C).Humidity
In September, the average relative humidity is 78%.Rainfall
In Mellen, in September, during 13.2 rainfall days, 1.54" (39mm) of precipitation is typically accumulated. In Mellen, Wisconsin, during the entire year, the rain falls for 120.3 days and collects up to 21.65" (550mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 6:23 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:43 pm CDT.
Sunshine
In September, the average sunshine in Mellen is 8.5h.UV index
In Mellen, Wisconsin, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: The UV index of 4 during September translates into the following guidance:
Guard yourself - Avoiding sunburn is suggested. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Frequently asked questions
What is the average September temperature in Mellen?
What is the average humidity in September in Mellen?
How much does it rain in Mellen in September?
When it does not snow in Mellen?
Does it snow in Mellen in September?
What is the average length of the day in September in Mellen?
When are sunrise and sunset in September in Mellen?
How many hours of sunshine does Mellen have in September?
How high is the UV index in September in Mellen?
Average temperature in September
Mellen, WI
- Average high temperature in September: 66.7°F
The warmest month (with the highest average high temperature) is July (76.3°F).
The month with the lowest average high temperature is January (19°F).
- Average low temperature in September: 50°F
The month with the highest average low temperature is July (57.6°F).
The coldest month (with the lowest average low temperature) is January (8.6°F).
Average pressure in September
Mellen, WI
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Mellen, WI
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is November (9.5mph).
The calmest month (with the lowest average wind speed) is July (6.9mph).
Average humidity in September
Mellen, WI
- Average humidity in September: 78%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is May (72%).
Average rainfall in September
Mellen, WI
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is May (2.48").
The driest months (with the least rainfall) are January and February (1.22").
Average rainfall days in September
Mellen, WI
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is June (15.1 days).
The month with the least rainy days is January (2.5 days).
Average snowfall in September
Mellen, WI
- Average snowfall in September: 0"
The month with the highest snowfall is December (10.04").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Mellen, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (24.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Mellen, WI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 6min).
Average sunshine days in September
Mellen, WI
- Average sunshine days in September: 14.3 days
The month with the most sunshine days is September (14.3 days).
The month with the least sunshine days is January (6.8 days).
Average UV index in September
Mellen, WI
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in September
Mellen, WI
- Average cloud cover in September: 38
The month with the most cloud cover is January (Cloud cover 80).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Mellen, WI
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (4mi).
Mellen, Wisconsin, USA
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