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 involves a decrease in temperature, down from a tropical 87.1°F (30.6°C) in August to a moderately hot 77.5°F (25.3°C). During the month of September, the temperature falls to an average of 58.3°F (14.6°C).Humidity
With an average relative humidity of 47%, September is the least humid month in Long Valley.Rainfall
In Long Valley, South Dakota, in September, during 8.5 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. Throughout the year, in Long Valley, there are 95.3 rainfall days, and 13.74" (349mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Long Valley.Daylight
In Long Valley, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:10 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:28 pm MDT.
Sunshine
The average sunshine in September in Long Valley is 9.9h.UV index
The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: In September, the UV index of 5 transforms into the following advice:
Make use of precautions - It is urged to ward off sun damage. The solar radiation around mid-day is intense; avoid the Sun and stay safe. 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.
Frequently asked questions
What is the average September temperature in Long Valley?
What is the least humid month in Long Valley?
What is the average humidity in September in Long Valley?
How many days does it rain in September in Long Valley?
When it does not snow in Long Valley?
Does it snow in Long Valley in September?
How many hours of daylight does Long Valley have in September?
When is the sunrise / sunset in September in Long Valley?
How long on average sun shines in September in Long Valley?
What is the UV index reading in September in Long Valley?
Average temperature in September
Long Valley, SD
- Average high temperature in September: 77.5°F
The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in September: 58.3°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in September
Long Valley, SD
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Long Valley, SD
- Average wind speed in September: 11.1mph
The windiest month (with the highest average wind speed) is April (12.1mph).
The calmest month (with the lowest average wind speed) is February (10.1mph).
Average humidity in September
Long Valley, SD
- Average humidity in September: 47%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is September (47%).
Average rainfall in September
Long Valley, SD
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in September
Long Valley, SD
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is May (13.5 days).
The month with the least rainy days is February (2.6 days).
Average snowfall in September
Long Valley, SD
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.15").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Long Valley, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (8.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Long Valley, 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 5min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).
Average sunshine days in September
Long Valley, SD
- Average sunshine days in September: 18.8 days
The month with the most sunshine days is December (21.1 days).
The months with the least sunshine days are April and June (14.1 days).
Average UV index in September
Long Valley, SD
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Long Valley, SD
- Average cloud cover in September: 19
The month with the most cloud cover is January (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in September
Long Valley, 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).
Long Valley, South Dakota, USA
Weather forecast for your location
2. Allow the app to use your location
