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 is characterized by a mild reduction in the average high-temperature, from a warm 80.1°F (26.7°C) in August to an agreeable 71.6°F (22°C). During September, the average low-temperature is recorded at a cool 51.3°F (10.7°C).Humidity
With an average relative humidity of 66%, September is the least humid month in Roslyn.Rainfall
In September, in Roslyn, South Dakota, the rain falls for 10.1 days. Throughout September, 1.57" (40mm) of precipitation is accumulated. Throughout the year, in Roslyn, there are 112.9 rainfall days, and 22.09" (561mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Roslyn.Daylight
The average length of the day in September in Roslyn is 12h and 31min.On the first day of September in Roslyn, sunrise is at 6:52 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 7:11 pm CDT.
Sunshine
In September, the average sunshine in Roslyn is 8.8h.UV index
The average daily maximum UV index in September in Roslyn is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The daily maximum UV index of 4 in September interprets into the following advice:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Frequently asked questions
What is the average September temperature in Roslyn?
What is the least humid month in Roslyn?
What is the average humidity in September in Roslyn?
How much does it rain in Roslyn in September?
When it does not snow in Roslyn?
Does it snow in Roslyn in September?
How many hours of daylight does Roslyn have in September?
When is the sunrise / sunset in September in Roslyn?
How long on average sun shines in September in Roslyn?
How high is the UV index in September in Roslyn?
Average temperature in September
Roslyn, SD
- Average high temperature in September: 71.6°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (18.9°F).
- Average low temperature in September: 51.3°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (5°F).
Average pressure in September
Roslyn, SD
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Roslyn, SD
- Average wind speed in September: 10.3mph
The windiest month (with the highest average wind speed) is April (11.7mph).
The calmest month (with the lowest average wind speed) is July (8.7mph).
Average humidity in September
Roslyn, SD
- Average humidity in September: 66%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is September (66%).
Average rainfall in September
Roslyn, SD
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is July (3.58").
The driest month (with the least rainfall) is November (0.63").
Average rainfall days in September
Roslyn, SD
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is June (17.9 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in September
Roslyn, SD
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Roslyn, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Roslyn, SD
- Average daylight in September: 12h and 3min
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: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in September
Roslyn, SD
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is June (10.4 days).
Average UV index in September
Roslyn, 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, November and December (UV index 1).
Average cloud cover in September
Roslyn, SD
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in September
Roslyn, SD
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
Roslyn, South Dakota, USA
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