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 the commencement of September, Stephan records a moderate temperature decline, with the average high easing from August's warm 84°F (28.9°C) to a still moderately hot 75.4°F (24.1°C). The month of September records an average low-temperature of 54.5°F (12.5°C).Humidity
With an average relative humidity of 60%, September is the least humid month.Rainfall
In Stephan, during September, the rain falls for 9 days and regularly aggregates up to 1.1" (28mm) of precipitation. Throughout the year, in Stephan, there are 97.3 rainfall days, and 16.73" (425mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Stephan, the average length of the day in September is 12h and 30min.On the first day of the month, sunrise is at 7:01 am and sunset at 8:13 pm. On the last day of September, in Stephan, South Dakota, sunrise is at 7:35 am and sunset at 7:19 pm CDT.
Sunshine
The average sunshine in September in Stephan is 8.6h.UV index
The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum UV index of 5 in September translates into the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. To guard against the harmful effects of the Sun, minimize exposure during midday. 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. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Frequently asked questions
What is the temperature in September in Stephan?
What is the least humid month in Stephan?
What is the average humidity in September in Stephan?
How many days does it rain in September in Stephan?
When it does not snow in Stephan?
Does it snow in Stephan in September?
How many hours of daylight does Stephan have in September?
When are sunrise and sunset in September in Stephan?
How long on average sun shines in September in Stephan?
What is the UV index intensity in September in Stephan?
Average temperature in September
Stephan, SD
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (23.4°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (9.1°F).
Average pressure in September
Stephan, SD
- Average pressure in September: 29.95"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Stephan, SD
- Average wind speed in September: 10.3mph
The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is August (8.9mph).
Average humidity in September
Stephan, SD
- Average humidity in September: 60%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is September (60%).
Average rainfall in September
Stephan, SD
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is July (3.07").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Stephan, SD
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is February (1.3 days).
Average snowfall in September
Stephan, SD
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Stephan, SD
- Average snowfall days in September: 0.1 days
The months with the highest number of snowfall days are January and February (10.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Stephan, 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: 8h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Stephan, SD
- Average sunshine days in September: 18.9 days
The month with the most sunshine days is November (22.1 days).
The month with the least sunshine days is June (12.4 days).
Average UV index in September
Stephan, SD
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Stephan, SD
- Average cloud cover in September: 26
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 24).
Average visibility in September
Stephan, SD
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Stephan, South Dakota, USA
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