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 implies a soft temperature shift, with average high-temperatures reducing from August's warm 76.5°F (24.7°C) to a pleasant 68.2°F (20.1°C). During September, the nighttime temperature averages to a frosty 49.6°F (9.8°C).Humidity
The average relative humidity in September is 78%.Rainfall
In September, the rain falls for 13.6 days. Throughout September, 1.5" (38mm) of precipitation is accumulated. In Clam Lake, during the entire year, the rain falls for 124.9 days and collects up to 21.85" (555mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 6:25 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:44 pm CDT.
Sunshine
In Clam Lake, Wisconsin, the average sunshine in September is 8.3h.UV index
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 unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 3 during September translates into these guidelines:
Heed the precautions - It is counselled to guard against solar damage. To guard against the harmful effects of the Sun, minimize exposure during midday. 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
What is the average September temperature?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Clam Lake have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Clam Lake, WI
- Average high temperature in September: 68.2°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (17.6°F).
- Average low temperature in September: 49.6°F
The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (5.5°F).
Average pressure in September
Clam Lake, WI
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Clam Lake, WI
- Average wind speed in September: 7.4mph
The windiest months (with the highest average wind speed) are April and November (8.3mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in September
Clam Lake, WI
- Average humidity in September: 78%
The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is May (72%).
Average rainfall in September
Clam Lake, WI
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is July (2.64").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in September
Clam Lake, WI
- Average rainfall days in September: 13.6 days
The month with the highest number of rainy days is June (16.3 days).
The month with the least rainy days is January (2.4 days).
Average snowfall in September
Clam Lake, WI
- Average snowfall in September: 0"
The month with the highest snowfall is December (9.09").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Clam Lake, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (23.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Clam Lake, WI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 2h and 12min).
Average sunshine days in September
Clam Lake, WI
- Average sunshine days in September: 14.1 days
The month with the most sunshine days is September (14.1 days).
The month with the least sunshine days is December (8.9 days).
Average UV index in September
Clam Lake, 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
Clam Lake, WI
- Average cloud cover in September: 40
The month with the most cloud cover is January (Cloud cover 80).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in September
Clam Lake, WI
- Average visibility in September: 5mi
The months with the highest visibility are May, June, July and October (6mi).
The months with the lowest visibility are January, February, March and December (4mi).
Clam Lake, Wisconsin, USA
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