September weather forecast
Lead, SD

Weather in September

September, the first month of the autumn, in Lead, is also an agreeable month, with temperature in the range of an average high of 71.8°F (22.1°C) and an average low of 51.3°F (10.7°C).

Temperature

In September, the average high-temperature slightly decreases, from a moderately hot 80.1°F (26.7°C) in August, to a pleasant 71.8°F (22.1°C). The average low-temperature, in September, is 51.3°F (10.7°C).

Humidity

Months with the lowest humidity are August and September, with an average relative humidity of 51%.

Rainfall

In Lead, during September, the rain falls for 6.8 days and regularly aggregates up to 0.67" (17mm) of precipitation. In Lead, South Dakota, during the entire year, the rain falls for 96.1 days and collects up to 14.02" (356mm) of precipitation.

Snowfall

January through June, September through December are months with snowfall in Lead. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, in Lead, South Dakota, there are 66.6 snowfall days, and 34.53" (877mm) of snow is accumulated.

Daylight

The average length of the day in Lead is 12.5h.

Sunshine

In September, the average sunshine is 10.5h.

UV index

In Lead, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the least humid month in Lead?

Months with the lowest humidity in Lead, South Dakota, are August and September, with an average relative humidity of 51%.

What is the average humidity in September in Lead?

In September, the average relative humidity is 51%.

How much does it rain in Lead in September?

In September, in Lead, South Dakota, the rain falls for 6.8 days. Throughout September, 0.67" (17mm) of precipitation is accumulated.

When does it start to snow in Lead?

September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.04" (1mm) of snow.

What is the average length of the day in September in Lead?

In Lead, South Dakota, the average length of the day in September is 12.5h.

How long on average sun shines in September in Lead?

The average sunshine in September in Lead is 10.5h.

What is the UV index reading in September in Lead?

In Lead, South Dakota, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Lead, SD

Average temperature in September - Lead, SD
  • Average high temperature in September: 22.1°C

The warmest month (with the highest average high temperature) is July (27.7°C).
The month with the lowest average high temperature is December (-1.3°C).

  • Average low temperature in September: 10.7°C

The month with the highest average low temperature is July (15.8°C).
The coldest month (with the lowest average low temperature) is February (-9.2°C).

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Average pressure in September
Lead, SD

Average pressure in September - Lead, SD
  • Average pressure in September: 1013.5mbar

The month with the highest atmospheric pressure is January (1020.5mbar).
The month with the lowest atmospheric pressure is June (1010.6mbar).

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Average wind speed in September
Lead, SD

Average wind speed in September - Lead, SD
  • Average wind speed in September: 13.7km/h

The windiest month (with the highest average wind speed) is October (16km/h).
The calmest month (with the lowest average wind speed) is August (12.3km/h).

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Average humidity in September
Lead, SD

Average humidity in September - Lead, SD
  • Average humidity in September: 51%

Months with the highest relative humidity are January and February (79%).
Months with the lowest relative humidity are August and September (51%).

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Average rainfall in September
Lead, SD

Average rainfall in September - Lead, SD
  • Average rainfall in September: 17mm

The wettest month (with the highest rainfall) is May (49mm).
The driest month (with the least rainfall) is January (14mm).

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Average rainfall days in September
Lead, SD

Average rainfall days in September - Lead, SD
  • Average rainfall days in September: 6.8 days

The month with the highest number of rainy days is June (14.2 days).
The month with the least rainy days is November (2.7 days).

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Average snowfall in September
Lead, SD

Average snowfall in September - Lead, SD
  • Average snowfall in September: 1mm

The month with the highest snowfall is April (166mm).
Months with the least snowfall are July and August (0mm).

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Average snowfall days in September
Lead, SD

Average snowfall days in September - Lead, SD
  • Average snowfall days in September: 0.3 days

The month with the highest number of snowfall days is January (11.7 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Lead, SD

Average daylight in September / Average sunshine in September - Lead, SD
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.5h).
The month with the shortest days is December (Average daylight: 8.9h).

  • Average sunshine in September: 10.5h

The month with the most sunshine is August (Average sunshine: 11.7h).
The month with the least sunshine is February (Average sunshine: 5.9h).

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Average sunshine days in September
Lead, SD

Average sunshine days in September - Lead, SD
  • Average sunshine days in September: 19.6 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is June (12.3 days).

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Average UV index in September
Lead, SD

Average UV index in September - Lead, SD
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average cloud cover in September
Lead, SD

Average cloud cover in September - Lead, SD
  • Average cloud cover in September: 18

Months with the most cloud cover are February and April (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 16).

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Average visibility in September
Lead, SD

Average visibility in September - Lead, SD
  • Average visibility in September: 10km

Months with the highest visibility are June, July, August and September (10km).
The month with the lowest visibility is January (8km).

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