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
September is marked by a subtle drop in average high-temperatures, transitioning from a moderately hot 77.5°F (25.3°C) in August to an agreeable 70.3°F (21.3°C). Grand Marsh records a consistent low-temperature of 52°F (11.1°C) during September nights.Humidity
In September, the average relative humidity is 79%.Rainfall
In September, the rain falls for 11.4 days. Throughout September, 2.24" (57mm) of precipitation is accumulated. Throughout the year, in Grand Marsh, there are 129.4 rainfall days, and 26.3" (668mm) of precipitation is accumulated.Snowfall
In Grand Marsh, snow does not fall in June through September.Daylight
The average length of the day in September in Grand Marsh is 12h and 29min.On the first day of September, sunrise is at 6:23 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:40 pm CDT.
Sunshine
In Grand Marsh, the average sunshine in September is 8.8h.UV index
In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index of 3 during September translates into these guidelines:
Act with care - The need to guard against sun damage is communicated. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Grand Marsh in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Grand Marsh have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Grand Marsh have in September?
What is the UV index intensity in September?
Average temperature in September
Grand Marsh, WI
- Average high temperature in September: 70.3°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 (21.7°F).
- Average low temperature in September: 52°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 (9.9°F).
Average pressure in September
Grand Marsh, WI
- Average pressure in September: 30.02"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
Grand Marsh, WI
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (10mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
Grand Marsh, WI
- Average humidity in September: 79%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Grand Marsh, WI
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is June (3.5").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in September
Grand Marsh, WI
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is June (16.6 days).
The month with the least rainy days is January (3.9 days).
Average snowfall in September
Grand Marsh, WI
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.96").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Grand Marsh, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grand Marsh, 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 5min
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 12min).
Average sunshine days in September
Grand Marsh, WI
- Average sunshine days in September: 16.7 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is May (12.3 days).
Average UV index in September
Grand Marsh, WI
- Average UV index in September: 3
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
Grand Marsh, WI
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 67).
The months with the least cloud cover are July and August (Cloud cover 33).
Average visibility in September
Grand Marsh, WI
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and July (5mi).
Grand Marsh, Wisconsin, USA
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