Pierre
South Dakota, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Pierre, SD

The Capitol Dome building in Pierre, South Dakota, set in a beautiful tree park, reflected in the waterfront
The Capitol Dome building in Pierre, South Dakota, set in a beautiful tree park, reflected in the waterfront
September, the first month of the autumn, in Pierre, is still a warm month, with average temperature fluctuating between 75.2°F (24°C) and 48.2°F (9°C).

Temperature

In Pierre, the average high-temperature in September decreases, from a tropical 87.8°F (31°C) in August, to a moderately hot 75.2°F (24°C). In September, the average low-temperature is 48.2°F (9°C).

Rainfall

In Pierre, in September, during 6 rainfall days, 1.3" (32mm) of precipitation is typically accumulated. Throughout the year, in Pierre, South Dakota, there are 87 rainfall days, and 14.9" (379mm) of precipitation is accumulated.

Daylight

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

Sunshine

The average sunshine in September is 9h.

UV index

In September, the average daily maximum UV index in Pierre is 6. A UV Index estimate of 6 to 7 represents a high health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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.

What is the temperature in September in Pierre?

The average high-temperature, in September, is 75.2°F (24°C), while the average low-temperature is 48.2°F (9°C).

How many days does it rain in September in Pierre?

In Pierre, in September, it is raining for 6 days, with typically 1.3" (32mm) of accumulated precipitation.

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

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

How long on average sun shines in September in Pierre?

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

What is the UV index intensity in September in Pierre?

In September, the average daily maximum UV index in Pierre, South Dakota, is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in September - Pierre, SD
  • Average high temperature in September: 75°F

The warmest month (with the highest average high temperature) is July (90°F).
The month with the lowest average high temperature is January (27°F).

  • Average low temperature in September: 48°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (7°F).

Average rainfall in September - Pierre, SD
  • Average rainfall in September: 1.3"

The wettest month (with the highest rainfall) is June (2.8").
The driest month (with the lowest rainfall) is January (0.2").

Average rainfall days in September - Pierre, SD
  • Average rainfall days in September: 6 days

Months with the highest number of rainy days are May and June (10 days).
Months with the lowest number of rainy days are October and November (5 days).

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 shortest days is December (Average daylight: 8.9h).

  • Average sunshine in September: 9h

The month with most sunshine is July (Average sunshine: 12h).
Months with least sunshine are November and December (Average sunshine: 5).

Average UV index in September - Pierre, SD
  • Average UV index in September: 6

The month with the highest UV index is July (UV index 9).
Months with the lowest UV index are January and December (UV index 1).