September weather forecastAltoona, WI
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Altoona, Wisconsin, with an average temperature varying between 50.4°F (10.2°C) and 70.2°F (21.2°C).Temperature
The arrival of September corresponds with a light shift in temperature, down from a moderately hot 76.8°F (24.9°C) in August to a pleasant 70.2°F (21.2°C). In the month of September, Altoona witnesses a consistent average low-temperature of 50.4°F (10.2°C).Humidity
In Altoona, the average relative humidity in September is 80%.Rainfall
In Altoona, during September, the rain falls for 12.7 days and regularly aggregates up to 2.24" (57mm) of precipitation. Throughout the year, there are 128.5 rainfall days, and 26.22" (666mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Altoona, the average length of the day in September is 12h and 31min.On the first day of September in Altoona, sunrise is at 6:28 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:47 pm CDT.
Sunshine
In September, the average sunshine is 8.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: The UV index of 4 during September leads to these advisories:
Be vigilant - Suggestions to stave off sun damage are provided. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Altoona, WI
- Average high temperature in September: 70.2°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (19.4°F).
- Average low temperature in September: 50.4°F
The month with the highest average low temperature is July (59.9°F).
The coldest month (with the lowest average low temperature) is January (6.3°F).
Average pressure in September
Altoona, WI
- Average pressure in September: 30.01"Hg
The months with the highest atmospheric pressure are January and February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Altoona, WI
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in September
Altoona, WI
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (91%).
The month with the lowest relative humidity is April (77%).
Average rainfall in September
Altoona, WI
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is June (4.29").
The driest month (with the least rainfall) is January (0.83").
Average rainfall days in September
Altoona, WI
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is January (2.7 days).
Average snowfall in September
Altoona, WI
- Average snowfall in September: 0"
The month with the highest snowfall is February (7.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Altoona, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Altoona, WI
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is February (Average sunshine: 2h and 54min).
Average sunshine days in September
Altoona, WI
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is January (17.4 days).
The month with the least sunshine days is June (10 days).
Average UV index in September
Altoona, 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, February, November and December (UV index 1).
Average cloud cover in September
Altoona, WI
- Average cloud cover in September: 38
The months with the most cloud cover are January, February and December (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Altoona, WI
- Average visibility in September: 5mi
The months with the highest visibility are April, May, June, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
