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 beginning of September brings a slight decrease in the average high-temperature, transitioning from a warm 80.1°F (26.7°C) in August to an agreeable 72.5°F (22.5°C). Nighttime temperature lowers to an average of 52.7°F (11.5°C) in September.Humidity
The average relative humidity in September in Clear Lake is 69%.Rainfall
In September, in Clear Lake, the rain falls for 9.8 days. Throughout September, 1.26" (32mm) of precipitation is accumulated. In Clear Lake, during the entire year, the rain falls for 101.9 days and collects up to 14.61" (371mm) of precipitation.Snowfall
In Clear Lake, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 31min.On the first day of September in Clear Lake, sunrise is at 6:50 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:08 pm CDT.
Sunshine
In Clear Lake, the average sunshine in September is 9.1h.UV index
The average daily maximum UV index in September in Clear Lake, South Dakota, is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: A maximum high UV index of 4 in September translates into the following recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Frequently asked questions
What is the temperature in September in Clear Lake?
What is the average humidity in September in Clear Lake?
How much does it rain in Clear Lake in September?
When it does not snow in Clear Lake?
Does it snow in Clear Lake in September?
How many hours of daylight does Clear Lake have in September?
When is the sunrise / sunset in September in Clear Lake?
How long on average sun shines in September in Clear Lake?
How high is the UV index in September in Clear Lake?
Average temperature in September
Clear Lake, SD
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (20.5°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (7.2°F).
Average pressure in September
Clear Lake, SD
- Average pressure in September: 29.98"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Clear Lake, SD
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is July (8mph).
Average humidity in September
Clear Lake, SD
- Average humidity in September: 69%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (67%).
Average rainfall in September
Clear Lake, SD
- Average rainfall in September: 1.26"
The wettest month (with the highest rainfall) is July (2.56").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Clear Lake, SD
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is June (16.5 days).
The month with the least rainy days is January (1.7 days).
Average snowfall in September
Clear Lake, SD
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.27").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Clear Lake, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Clear Lake, SD
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Clear Lake, SD
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in September
Clear Lake, SD
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and November (UV index 1).
Average cloud cover in September
Clear Lake, SD
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in September
Clear Lake, SD
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Clear Lake, South Dakota, USA
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