September weather forecastColby, WI
September
Weather in September
September, the first month of the autumn in Colby, is still a pleasant month, with temperature in the range of an average high of 68.4°F (20.2°C) and an average low of 49.1°F (9.5°C).Temperature
The start of September comes with a small reduction in the average high-temperature, subtly receding from a moderately hot 75.4°F (24.1°C) in August to an agreeable 68.4°F (20.2°C). During the month of September, an average low-temperature of 49.1°F (9.5°C) is recorded in Colby.Humidity
The average relative humidity in September in Colby is 81%.Rainfall
In Colby, during September, the rain falls for 9.3 days and regularly aggregates up to 0.87" (22mm) of precipitation. Throughout the year, there are 102.5 rainfall days, and 11.18" (284mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Colby.Daylight
In September, the average length of the day in Colby is 12h and 31min.On the first day of September, sunrise is at 6:24 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:43 pm CDT.
Sunshine
In September, the average sunshine is 8.2h.UV index
In Colby, Wisconsin, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: A typical high UV index of 3 in September suggests the following recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Colby, WI
- Average high temperature in September: 68.4°F
The warmest month (with the highest average high temperature) is July (76.8°F).
The month with the lowest average high temperature is January (18.9°F).
- Average low temperature in September: 49.1°F
The month with the highest average low temperature is July (58.5°F).
The coldest month (with the lowest average low temperature) is January (6.4°F).
Average pressure in September
Colby, WI
- Average pressure in September: 30.01"Hg
The months with the highest atmospheric pressure are January and February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Colby, WI
- Average wind speed in September: 7.9mph
The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in September
Colby, WI
- Average humidity in September: 81%
The months with the highest relative humidity are January and February (92%).
The months with the lowest relative humidity are April and May (78%).
Average rainfall in September
Colby, WI
- Average rainfall in September: 0.87"
The wettest month (with the highest rainfall) is June (1.61").
The driest month (with the least rainfall) is January (0.35").
Average rainfall days in September
Colby, WI
- Average rainfall days in September: 9.3 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (1.5 days).
Average snowfall in September
Colby, WI
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.52").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Colby, 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
Colby, 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 48min).
- Average sunshine in September: 8h and 12min
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 42min).
Average sunshine days in September
Colby, WI
- Average sunshine days in September: 18.8 days
The month with the most sunshine days is January (20.1 days).
The month with the least sunshine days is June (12.4 days).
Average UV index in September
Colby, WI
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Colby, WI
- Average cloud cover in September: 40
The month with the most cloud cover is January (Cloud cover 74).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility in September
Colby, 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, February, March, July, August, September and December (5mi).
