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
A modest decline in the average high-temperature is seen during September, decreasing from a warm 77.9°F (25.5°C) in August to an agreeable 71.1°F (21.7°C). An average low-temperature of 51.1°F (10.6°C) is recorded during the nights in September in French Island.Humidity
The average relative humidity in September in French Island, Wisconsin, is 80%.Rainfall
In French Island, in September, it is raining for 11.9 days, with typically 2.32" (59mm) of accumulated precipitation. Throughout the year, in French Island, there are 129.3 rainfall days, and 26.42" (671mm) of precipitation is accumulated.Snowfall
In French Island, Wisconsin, snow does not fall in June through September.Daylight
In French Island, the average length of the day in September is 12h and 29min.On the first day of September in French Island, sunrise is at 6:29 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:47 pm CDT.
Sunshine
In French Island, the average sunshine in September is 8.7h.UV index
In French Island, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 3 translates into these guidelines:
Ensure safety - Recommendations to avert sunburn are presented. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Frequently asked questions
What are September temperatures in French Island?
What is the average humidity in September in French Island?
How many days does it rain in September in French Island?
When it does not snow in French Island?
Does it snow in French Island in September?
How many hours of daylight does French Island have in September?
What time are sunrise and sunset in September in French Island?
How long on average sun shines in September in French Island?
What is the UV index reading in September in French Island?
Average temperature in September
French Island, WI
- Average high temperature in September: 71.1°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (21.6°F).
- Average low temperature in September: 51.1°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (8.2°F).
Average pressure in September
French Island, WI
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
French Island, WI
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in September
French Island, WI
- Average humidity in September: 80%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is October (76%).
Average rainfall in September
French Island, WI
- Average rainfall in September: 2.32"
The wettest month (with the highest rainfall) is June (4.61").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in September
French Island, WI
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (3.2 days).
Average snowfall in September
French Island, WI
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
French Island, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
French Island, WI
- Average daylight in September: 12h and 3min
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 4min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in September
French Island, WI
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is December (18.2 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in September
French Island, 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
French Island, WI
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
French Island, WI
- Average visibility in September: 5mi
The months with the highest visibility are April, May, June, October and November (6mi).
The month with the lowest visibility is January (4mi).
French Island, Wisconsin, USA
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