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
With the beginning of September, the average high-temperature shows a small decrease, transitioning from a warm 75.2°F (24°C) in August to an enjoyable 67.1°F (19.5°C). An average low-temperature of 48°F (8.9°C) is expected during September.Humidity
The average relative humidity in September is 80%.Rainfall
In Argonne, in September, it is raining for 12.4 days, with typically 1.73" (44mm) of accumulated precipitation. In Argonne, Wisconsin, during the entire year, the rain falls for 120.4 days and collects up to 22.99" (584mm) of precipitation.Snowfall
In Argonne, snow does not fall in June through September.Daylight
In Argonne, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:53 am and sunset at 6:37 pm CDT.
Sunshine
In Argonne, the average sunshine in September is 7.6h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
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 in Argonne?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Argonne, WI
- Average high temperature in September: 67.1°F
The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is January (19.8°F).
- Average low temperature in September: 48°F
The month with the highest average low temperature is July (56.5°F).
The coldest month (with the lowest average low temperature) is January (8.4°F).
Average pressure in September
Argonne, WI
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Argonne, WI
- Average wind speed in September: 7.3mph
The windiest months (with the highest average wind speed) are April and November (8.5mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in September
Argonne, 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 May (72%).
Average rainfall in September
Argonne, WI
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is June (2.83").
The driest month (with the least rainfall) is January (1.02").
Average rainfall days in September
Argonne, WI
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is May (16.1 days).
The month with the least rainy days is February (2.4 days).
Average snowfall in September
Argonne, WI
- Average snowfall in September: 0"
The month with the highest snowfall is February (7.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Argonne, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (20.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Argonne, 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: 7h and 4min
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 12min).
Average sunshine days in September
Argonne, WI
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is September (15.3 days).
The month with the least sunshine days is February (10.8 days).
Average UV index in September
Argonne, 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
Argonne, WI
- Average cloud cover in September: 46
The months with the most cloud cover are January and February (Cloud cover 79).
The month with the least cloud cover is July (Cloud cover 40).
Average visibility in September
Argonne, WI
- Average visibility in September: 5mi
The months with the highest visibility are May, June and October (6mi).
The months with the lowest visibility are January and February (4mi).
Argonne, Wisconsin, USA
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