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's arrival comes with a mild decrease in the average high-temperature, moving subtly from a warm 76.5°F (24.7°C) in August to an agreeable 68.9°F (20.5°C). September nights are marked by an average low-temperature of 49.3°F (9.6°C).Humidity
In September, the average relative humidity is 80%.Rainfall
In Birchwood, in September, during 12.6 rainfall days, 1.93" (49mm) of precipitation is typically accumulated. In Birchwood, during the entire year, the rain falls for 128.9 days and collects up to 23.46" (596mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:28 am and sunset at 7:43 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:47 pm CDT.
Sunshine
In Birchwood, the average sunshine in September is 8.1h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: An average maximum UV index of 4 in September leads to these recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. Around midday, solar radiation is most harmful; hence, exposure should be limited. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Birchwood have in September?
What is the UV index reading in September?
Average temperature in September
Birchwood, WI
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (17.6°F).
- Average low temperature in September: 49.3°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (5°F).
Average pressure in September
Birchwood, WI
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Birchwood, WI
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
Birchwood, WI
- Average humidity in September: 80%
The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is May (76%).
Average rainfall in September
Birchwood, WI
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is June (3.5").
The driest month (with the least rainfall) is January (0.79").
Average rainfall days in September
Birchwood, WI
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is June (18.2 days).
The month with the least rainy days is February (2.5 days).
Average snowfall in September
Birchwood, WI
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.59").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Birchwood, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (18.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Birchwood, WI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 30min).
Average sunshine days in September
Birchwood, WI
- Average sunshine days in September: 15.4 days
The month with the most sunshine days is September (15.4 days).
The month with the least sunshine days is June (9.7 days).
Average UV index in September
Birchwood, WI
- Average UV index in September: 4
The months with the highest UV index are May, June and July (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in September
Birchwood, WI
- Average cloud cover in September: 40
The months with the most cloud cover are January and February (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in September
Birchwood, WI
- Average visibility in September: 5mi
The months with the highest visibility are May and June (6mi).
The months with the lowest visibility are January, February and December (4mi).
Birchwood, Wisconsin, USA
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