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
September's arrival aligns with a minor decrease in average high-temperatures, from August's warm 81.3°F (27.4°C) to a pleasant 73.2°F (22.9°C). Throughout September, the temperature in White Rock tends to fall to a consistent average low of 52.9°F (11.6°C).Humidity
The least humid month in White Rock is September, with an average relative humidity of 65%.Rainfall
In White Rock, during September, the rain falls for 8.9 days and regularly aggregates up to 1.54" (39mm) of precipitation. Throughout the year, in White Rock, there are 102 rainfall days, and 19.17" (487mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day in White Rock, South Dakota, is 12h and 31min.On the first day of the month, sunrise is at 6:48 am and sunset at 8:03 pm. On the last day of September, sunrise is at 7:24 am and sunset at 7:07 pm CDT.
Sunshine
In White Rock, South Dakota, the average sunshine in September is 8.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Adopt protective measures - It is advised to guard against sun damage. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in White Rock?
What is the least humid month in White Rock?
What is the average humidity in September in White Rock?
How much does it rain in White Rock in September?
When it does not snow in White Rock?
Does it snow in White Rock in September?
What is the average length of the day in September in White Rock?
When is the sunrise / sunset in September in White Rock?
How long on average sun shines in September in White Rock?
How high is the UV index in September in White Rock?
Average temperature in September
White Rock, SD
- Average high temperature in September: 73.2°F
The warmest months (with the highest average high temperature) are July and August (81.3°F).
The month with the lowest average high temperature is January (18.7°F).
- Average low temperature in September: 52.9°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (4.8°F).
Average pressure in September
White Rock, SD
- Average pressure in September: 29.97"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
White Rock, SD
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is July (8mph).
Average humidity in September
White Rock, SD
- Average humidity in September: 65%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is September (65%).
Average rainfall in September
White Rock, SD
- Average rainfall in September: 1.54"
The wettest months (with the highest rainfall) are June and July (3.03").
The driest month (with the least rainfall) is February (0.55").
Average rainfall days in September
White Rock, SD
- Average rainfall days in September: 8.9 days
The month with the highest number of rainy days is June (15.4 days).
The month with the least rainy days is February (2 days).
Average snowfall in September
White Rock, SD
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.45").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
White Rock, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
White Rock, SD
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
White Rock, SD
- Average sunshine days in September: 19.5 days
The month with the most sunshine days is September (19.5 days).
The month with the least sunshine days is June (12.4 days).
Average UV index in September
White Rock, SD
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
White Rock, SD
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
White Rock, SD
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
White Rock, South Dakota, USA
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