September weather forecast and climate
Pierre, SD

The Capitol Dome building in Pierre, South Dakota, set in a beautiful tree park
The Capitol Dome building in Pierre, South Dakota, set in a beautiful tree park

Weather in September

The first month of the autumn, September, is still a warm month in Pierre, South Dakota, with average temperature ranging between min 57.4°F (14.1°C) and max 76.8°F (24.9°C).

Temperature

In September, the average high-temperature drops, from a hot 86°F (30°C) in August, to a moderately hot 76.8°F (24.9°C). In September, the average low-temperature is 57.4°F (14.1°C).

Humidity

August and September, with an average relative humidity of 52%, are the least humid months in Pierre.

Rainfall

In Pierre, South Dakota, during 8.9 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. Throughout the year, there are 98.5 rainfall days, and 13.7" (348mm) of precipitation is accumulated.

Snowfall

In Pierre, South Dakota, snow does not fall in June through September.

Daylight

In Pierre, the average length of the day in September is 12.5h.

Sunshine

In September, the average sunshine is 9h.

UV index

In Pierre, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Pierre?

In September, in Pierre, South Dakota, the average high-temperature is 76.8°F (24.9°C), and the average low-temperature is 57.4°F (14.1°C).

What is the least humid month in Pierre?

Months with the lowest humidity in Pierre, South Dakota, are August and September, with an average relative humidity of 52%.

What is the average humidity in September in Pierre?

The average relative humidity in September is 52%.

How many days does it rain in September in Pierre?

In September, in Pierre, South Dakota, the rain falls for 8.9 days. Throughout September, 0.67" (17mm) of precipitation is accumulated.

Does it snow in Pierre in September?

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

When it does not snow in Pierre?

June through September are months without snowfall.

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

The average length of the day in September in Pierre, South Dakota, is 12.5h.

How long on average sun shines in September in Pierre?

In September, the average sunshine is 9h.

What is the UV index intensity in September in Pierre?

In September, the average daily maximum UV index in Pierre is 5. 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
Pierre, SD

Average temperature in September - Pierre, SD
  • Average high temperature in September: 76.8°F

The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is January (26.2°F).

  • Average low temperature in September: 57.4°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).

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Average pressure in September
Pierre, SD

Average pressure in September - Pierre, SD
  • Average pressure in September: 29.94"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.84").

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Average wind speed in September
Pierre, SD

Average wind speed in September - Pierre, SD
  • Average wind speed in September: 11.1mph

The windiest month (with the highest average wind speed) is April (11.9mph).
The calmest months (with the lowest average wind speed) are February and August (9.9mph).

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Average humidity in September
Pierre, SD

Average humidity in September - Pierre, SD
  • Average humidity in September: 52%

The month with the highest relative humidity is January (85%).
Months with the lowest relative humidity are August and September (52%).

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Average rainfall in September
Pierre, SD

Average rainfall in September - Pierre, SD
  • Average rainfall in September: 0.67"

The wettest month (with the highest rainfall) is May (2.24").
The driest month (with the least rainfall) is January (0.35").

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Average rainfall days in September
Pierre, SD

Average rainfall days in September - Pierre, SD
  • Average rainfall days in September: 8.9 days

The month with the highest number of rainy days is June (14.2 days).
The month with the least rainy days is February (2.4 days).

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Average snowfall in September
Pierre, SD

Average snowfall in September - Pierre, SD
  • Average snowfall in September: 0"

The month with the highest snowfall is February (3.66").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Pierre, SD

Average snowfall days in September - Pierre, SD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (10 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Pierre, 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: 9h

The month with the most sunshine is July (Average sunshine: 11.5h).
The month with the least sunshine is January (Average sunshine: 4.6h).

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Average sunshine days in September
Pierre, SD

Average sunshine days in September - Pierre, SD
  • Average sunshine days in September: 18.8 days

The month with the most sunshine days is November (22.3 days).
The month with the least sunshine days is June (13.7 days).

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Average UV index in September
Pierre, SD

Average UV index in September - Pierre, SD
  • Average UV index in September: 5

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are February and December (UV index 1).

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Average cloud cover in September
Pierre, SD

Average cloud cover in September - Pierre, SD
  • Average cloud cover in September: 21

The month with the most cloud cover is January (Cloud cover 50).
Months with the least cloud cover are July and August (Cloud cover 19).

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Average visibility in September
Pierre, SD

Average visibility in September - Pierre, SD
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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