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 weather is marked by a drop in the average high-temperature, falling from 85.8°F (29.9°C) in August to a still moderately hot 76.6°F (24.8°C). White River, during September nights, observes an average temperature of 56.3°F (13.5°C).Humidity
The months with the lowest humidity are August and September, with an average relative humidity of 57%.Rainfall
In White River, in September, during 9.5 rainfall days, 1.34" (34mm) of precipitation is typically accumulated. In White River, South Dakota, during the entire year, the rain falls for 103.9 days and collects up to 16.85" (428mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In White River, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 7:07 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 7:25 pm CDT.
Sunshine
The average sunshine in September is 9h.UV index
In White River, 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 unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. 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 usual temperature for White River in September?
What is the least humid month?
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?
What time are sunrise and sunset in September in White River?
How long on average sun shines in September in White River?
What is the UV index reading in September?
Average temperature in September
White River, SD
- Average high temperature in September: 76.6°F
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).
Average pressure in September
White River, SD
- Average pressure in September: 29.95"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
White River, SD
- Average wind speed in September: 10.7mph
The windiest month (with the highest average wind speed) is April (11.9mph).
The calmest month (with the lowest average wind speed) is August (9.8mph).
Average humidity in September
White River, SD
- Average humidity in September: 57%
The month with the highest relative humidity is January (82%).
The months with the lowest relative humidity are August and September (57%).
Average rainfall in September
White River, SD
- Average rainfall in September: 1.34"
The wettest month (with the highest rainfall) is June (2.8").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in September
White River, SD
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is June (15.3 days).
The months with the least rainy days are January and February (2.7 days).
Average snowfall in September
White River, SD
- Average snowfall in September: 0"
The month with the highest snowfall is December (3.19").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
White River, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.6 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 River, SD
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days in September
White River, SD
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is November (20.8 days).
The month with the least sunshine days is June (11.2 days).
Average UV index in September
White River, 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 December (UV index 1).
Average cloud cover in September
White River, SD
- Average cloud cover in September: 22
The month with the most cloud cover is January (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 20).
Average visibility in September
White River, 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).
White River, South Dakota, USA
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