September weather forecastPrinceton, WI
September
Weather in September
September, the first month of the autumn in Princeton, is also an agreeable month, with an average temperature ranging between min 51.6°F (10.9°C) and max 70.7°F (21.5°C).Temperature
September brings a slight decrease in the average high-temperature, shifting from a moderately hot 77.4°F (25.2°C) in August to a pleasant 70.7°F (21.5°C). In the month of September, the average temperature dips to a cool 51.6°F (10.9°C) during the night.Humidity
In Princeton, the average relative humidity in September is 80%.Rainfall
In Princeton, during September, the rain falls for 12.2 days and regularly aggregates up to 2.09" (53mm) of precipitation. In Princeton, Wisconsin, during the entire year, the rain falls for 129.3 days and collects up to 25.51" (648mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:31 pm. On the last day of September, in Princeton, sunrise is at 6:53 am and sunset at 6:38 pm CDT.
Sunshine
In September, the average sunshine is 8.7h.UV index
In Princeton, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the average maximum UV index of 3 translates into the following recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. To protect against the Sun's most potent rays, avoid direct exposure around midday. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Princeton, WI
- Average high temperature in September: 70.7°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 (22.1°F).
- Average low temperature in September: 51.6°F
The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (10.4°F).
Average pressure in September
Princeton, WI
- Average pressure in September: 30.02"Hg
The months with the highest atmospheric pressure are January and February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Princeton, WI
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (10mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in September
Princeton, WI
- Average humidity in September: 80%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Princeton, WI
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is June (3.46").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in September
Princeton, WI
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is June (16.8 days).
The month with the least rainy days is February (3 days).
Average snowfall in September
Princeton, WI
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Princeton, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Princeton, WI
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
Princeton, WI
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is December (17.9 days).
The month with the least sunshine days is July (10.3 days).
Average UV index in September
Princeton, WI
- Average UV index in September: 3
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, February, November and December (UV index 1).
Average cloud cover in September
Princeton, 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 and August (Cloud cover 33).
Average visibility in September
Princeton, WI
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, August, September, October and November (6mi).
The months with the lowest visibility are January, February, July and December (5mi).
