September weather forecastSummit, SD
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Summit, South Dakota, with an average temperature varying between 72.5°F (22.5°C) and 52.7°F (11.5°C).Temperature
Summit in September undergoes a slight reduction in the average high-temperature, shifting from August's warm 80.8°F (27.1°C) to a pleasant 72.5°F (22.5°C). September witnesses an average low-temperature hovering around a cool 52.7°F (11.5°C).Humidity
The average relative humidity in September is 67%.Rainfall
In Summit, during September, the rain falls for 10 days and regularly aggregates up to 1.61" (41mm) of precipitation. Throughout the year, there are 115.2 rainfall days, and 19.88" (505mm) of precipitation is accumulated.Snowfall
In Summit, snow does not fall in June through September.Daylight
The average length of the day in September in Summit is 12h and 31min.On the first day of September, sunrise is at 6:50 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:09 pm CDT.
Sunshine
In Summit, the average sunshine in September is 9h.UV index
In Summit, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Take precautions - Protection against sun damage is advised. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Summit, SD
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (19.6°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (6.1°F).
Average pressure in September
Summit, 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
Summit, SD
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is July (8mph).
Average humidity in September
Summit, SD
- Average humidity in September: 67%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (66%).
Average rainfall in September
Summit, SD
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is June (3.11").
The driest months (with the least rainfall) are January and February (0.63").
Average rainfall days in September
Summit, SD
- Average rainfall days in September: 10 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in September
Summit, SD
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.49").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Summit, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Summit, SD
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 9h and 0min
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 54min).
Average sunshine days in September
Summit, SD
- Average sunshine days in September: 18 days
The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is June (9.6 days).
Average UV index in September
Summit, SD
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Summit, SD
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are July and August (Cloud cover 25).
Average visibility in September
Summit, 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).
