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
The onset of September is marked by a decrease in temperature, transitioning from a warm 77.2°F (25.1°C) in August to a refreshing 67.3°F (19.6°C). During September, the nighttime temperature averages to a frosty 47.8°F (8.8°C).Humidity
The average relative humidity in September is 73%.Rainfall
In Cass Lake, Minnesota, in September, during 11.5 rainfall days, 1.69" (43mm) of precipitation is typically accumulated. Throughout the year, there are 105.3 rainfall days, and 19.69" (500mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Cass Lake, the average length of the day in September is 12h and 33min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:57 pm. On the last day of September, in Cass Lake, sunrise is at 7:17 am and sunset at 6:59 pm CDT.
Sunshine
In Cass Lake, the average sunshine in September is 8h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Act with care - The suggestion to avoid sunburn is emphasized. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
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 many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Cass Lake have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Cass Lake have in September?
How high is the UV index in September in Cass Lake?
Average temperature in September
Cass Lake, MN
- Average high temperature in September: 67.3°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 (16.2°F).
- Average low temperature in September: 47.8°F
The month with the highest average low temperature is July (57.6°F).
The coldest month (with the lowest average low temperature) is January (1.6°F).
Average pressure in September
Cass Lake, MN
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Cass Lake, MN
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is October (8.2mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in September
Cass Lake, MN
- Average humidity in September: 73%
The months with the highest relative humidity are January and February (93%).
The month with the lowest relative humidity is May (70%).
Average rainfall in September
Cass Lake, MN
- Average rainfall in September: 1.69"
The wettest month (with the highest rainfall) is June (2.91").
The driest months (with the least rainfall) are January and February (0.75").
Average rainfall days in September
Cass Lake, MN
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is June (16.5 days).
The month with the least rainy days is February (1.3 days).
Average snowfall in September
Cass Lake, MN
- Average snowfall in September: 0"
The month with the highest snowfall is December (7.28").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Cass Lake, MN
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (18.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Cass Lake, MN
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 8h
The month with the most sunshine is July (Average sunshine: 10h).
The month with the least sunshine is January (Average sunshine: 2h).
Average sunshine days in September
Cass Lake, MN
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is August (17.2 days).
The month with the least sunshine days is June (11.7 days).
Average UV index in September
Cass Lake, MN
- Average UV index in September: 4
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
Cass Lake, MN
- Average cloud cover in September: 40
The month with the most cloud cover is January (Cloud cover 80).
The months with the least cloud cover are July and August (Cloud cover 34).
Average visibility in September
Cass Lake, MN
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February, March and December (4mi).
Cass Lake, Minnesota, USA
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