Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With September's onset, the weather shows a temperature decrease, transitioning from a tropical 86°F (30°C) in August to a moderately hot 76.8°F (24.9°C). Pierre experiences an average low-temperature of 57.4°F (14.1°C) in month of September.Humidity
The months with the lowest humidity are August and September, with an average relative humidity of 52%.Rainfall
In Pierre, during September, the rain falls for 8.9 days and regularly aggregates up to 0.67" (17mm) of precipitation. Throughout the year, there are 98.5 rainfall days, and 13.7" (348mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Pierre.Daylight
In Pierre, the average length of the day in September is 12h and 30min.On the first day of the month, sunrise is at 7:05 am and sunset at 8:17 pm. On the last day of September, sunrise is at 7:38 am and sunset at 7:23 pm CDT.
Sunshine
The average sunshine in September is 9h.UV index
In Pierre, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily maximum UV index of 5 in September translates into the following instructions:
Take precautions - Protection against sun damage is advised. Around midday, solar radiation is most harmful; hence, exposure should be limited. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Pierre in September?
What are the least humid months?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Pierre have in September?
What is the UV index reading in September?
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in September /
Average sunshine in September
Pierre, 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 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).
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).
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).
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).
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).
Pierre, South Dakota, USA
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