September weather forecast
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 also a moderately hot month in Pierre, South Dakota, with an average temperature fluctuating between 57.4°F (14.1°C) and 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 warm 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 September, the rain falls for 8.9 days and regularly aggregates up to 0.67" (17mm) of precipitation. In Pierre, during the entire year, the rain falls for 98.5 days and collects up to 13.7" (348mm) of precipitation.

Snowfall

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

Daylight

In September, the average length of the day is 12h and 30min.
On the first day of the month, sunrise is at 7:04 am and sunset at 8:18 pm. On the last day of September, sunrise is at 7:38 am and sunset at 7:24 pm CDT.

Sunshine

In September, the average sunshine in Pierre is 9h.

UV index

In Pierre, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Pierre?

The average high-temperature, in September, is 76.8°F (24.9°C), while the average low-temperature is 57.4°F (14.1°C). in August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is appraised at 87.8°F (31°C).

What are the least humid months in Pierre?

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

What is the average humidity in September in Pierre?

In Pierre, the average relative humidity in September is 52%.

How many days does it rain in September in Pierre?

In Pierre, South Dakota, in September, it is raining for 8.9 days, with typically 0.67" (17mm) of accumulated precipitation.

When it does not snow in Pierre?

June through September are months without snowfall in Pierre.

Does it snow in Pierre in September?

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

How many hours of daylight does Pierre have in September?

The average day length in September in Pierre is 12h and 30min.

When is the sunrise / sunset in September in Pierre?

On the first day of September, sunrise is at 7:04 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 7:24 pm CDT.

How long on average sun shines in September in Pierre?

In Pierre, the average sunshine duration in September is 9h.

What is the UV index intensity in September in Pierre?

The average daily maximum UV index in September in Pierre, South Dakota, is 5. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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%).
The 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").
The 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).
The 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: 12h and 30min

The month with the longest days is June (Average daylight: 15h and 29min).
The month with the shortest days is December (Average daylight: 8h and 55min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

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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).
The 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).
The 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

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

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