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
In September, the average high-temperature goes from a warm 81.9°F (27.7°C) in August to a pleasant 72.5°F (22.5°C). North Spearfish, in the month of September, anticipates a consistent average low-temperature of 52°F (11.1°C).Humidity
In North Spearfish, South Dakota, the average relative humidity in September is 50%.Rainfall
In North Spearfish, in September, during 7.6 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. In North Spearfish, during the entire year, the rain falls for 99.6 days and collects up to 15.63" (397mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows in North Spearfish. Throughout September, in the average 0.1 snowfall days, it receives 0.16" (4mm) of snow. In North Spearfish, during the entire year, snow falls for 56.8 days and aggregates up to 36.3" (922mm) of snow.Daylight
In North Spearfish, the average length of the day in September is 12h and 30min.On the first day of the month, sunrise is at 6:19 am and sunset at 7:31 pm. On the last day of September, in North Spearfish, sunrise is at 6:53 am and sunset at 6:37 pm MDT.
Sunshine
The average sunshine in September in North Spearfish, South Dakota, is 10.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Frequently asked questions
What is the temperature in September in North Spearfish?
What is the average humidity in September in North Spearfish?
How many days does it rain in September in North Spearfish?
When does it start to snow in North Spearfish?
How many hours of daylight does North Spearfish have in September?
When is the sunrise / sunset in September in North Spearfish?
How long on average sun shines in September in North Spearfish?
What is the UV index reading in September in North Spearfish?
Average temperature in September
North Spearfish, SD
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (30.9°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is February (16.2°F).
Average pressure in September
North Spearfish, SD
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
North Spearfish, SD
- Average wind speed in September: 8.8mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (8mph).
Average humidity in September
North Spearfish, SD
- Average humidity in September: 50%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (49%).
Average rainfall in September
North Spearfish, SD
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is May (2.32").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in September
North Spearfish, SD
- Average rainfall days in September: 7.6 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (2.9 days).
Average snowfall in September
North Spearfish, SD
- Average snowfall in September: 0.16"
The month with the highest snowfall is April (7.36").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
North Spearfish, SD
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (11.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
North Spearfish, 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: 10h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 42min).
Average sunshine days in September
North Spearfish, SD
- Average sunshine days in September: 20.1 days
The month with the most sunshine days is November (20.3 days).
The month with the least sunshine days is May (12.7 days).
Average UV index in September
North Spearfish, SD
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, April, November and December (UV index 2).
Average cloud cover in September
North Spearfish, SD
- Average cloud cover in September: 18
The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
North Spearfish, 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).
North Spearfish, South Dakota, USA
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