September weather forecast
Clear Lake, SD

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Weather in September

September, the first month of the autumn in Clear Lake, is also an agreeable month, with temperature in the range of an average high of 72.5°F (22.5°C) and an average low of 52.7°F (11.5°C).

Temperature

With the onset of September, Clear Lake's climate undergoes a slight change as the average high-temperature moves from a moderately hot 80.1°F (26.7°C) in August to a pleasant 72.5°F (22.5°C). In Clear Lake, an average low-temperature of 52.7°F (11.5°C) is recorded during September nights.

Humidity

In Clear Lake, the average relative humidity in September is 69%.

Rainfall

In Clear Lake, in September, during 9.8 rainfall days, 1.26" (32mm) of precipitation is typically accumulated. Throughout the year, there are 101.9 rainfall days, and 14.61" (371mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in September is 12h and 31min.
On the first day of September, 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

The average sunshine in September is 9.1h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 4 translates into these guidelines:
Exercise prevention - Protecting skin and eyes from harm is required. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Updated: Jun 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in September?

An average high-temperature, in September, in Clear Lake, is 72.5°F (22.5°C) and the average low-temperature is 52.7°F (11.5°C). The average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, in July is estimated at 86°F (30°C).

What is the average humidity in September in Clear Lake?

In Clear Lake, the average relative humidity in September is 69%.

How many days does it rain in September?

In Clear Lake, in September, it is raining for 9.8 days, with typically 1.26" (32mm) of accumulated precipitation.

When it does not snow?

In Clear Lake, snow does not fall in June through September.

Does it snow in September?

In Clear Lake, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September?

In Clear Lake, the average day length in September is 12h and 31min.

What time are sunrise and sunset in September?

On the first day of September, 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.

How long on average sun shines in September?

The average sunshine duration in September is 9.1h.

How high is the UV index in September?

In Clear Lake, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Clear Lake, SD

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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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