September weather forecastHecla, SD
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Hecla, South Dakota, with an average temperature fluctuating between 72.7°F (22.6°C) and 52.3°F (11.3°C).Temperature
With the onset of September, Hecla's climate undergoes a slight change as the average high-temperature moves from a moderately hot 81.1°F (27.3°C) in August to a pleasant 72.7°F (22.6°C). September in Hecla witnesses an average low-temperature hovering around a fresh 52.3°F (11.3°C).Humidity
The months with the lowest humidity are August and September, with an average relative humidity of 62%.Rainfall
In Hecla, in September, during 9.5 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. Throughout the year, there are 109.5 rainfall days, and 20.39" (518mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Hecla, the average length of the day in September is 12h and 31min.On the first day of September in Hecla, sunrise is at 6:54 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 7:13 pm CDT.
Sunshine
In Hecla, the average sunshine in September is 8.8h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the maximum UV index of 4 suggests this advice:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hecla, SD
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (19°F).
- Average low temperature in September: 52.3°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 (5.4°F).
Average pressure in September
Hecla, 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
Hecla, SD
- Average wind speed in September: 9.6mph
The windiest month (with the highest average wind speed) is October (10.8mph).
The calmest month (with the lowest average wind speed) is July (8.1mph).
Average humidity in September
Hecla, SD
- Average humidity in September: 62%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are August and September (62%).
Average rainfall in September
Hecla, SD
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is June (3.62").
The driest month (with the least rainfall) is January (0.63").
Average rainfall days in September
Hecla, SD
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is June (16.8 days).
The month with the least rainy days is February (2.4 days).
Average snowfall in September
Hecla, SD
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.61").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Hecla, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Hecla, SD
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Hecla, SD
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in September
Hecla, 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 and November (UV index 1).
Average cloud cover in September
Hecla, SD
- Average cloud cover in September: 26
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in September
Hecla, SD
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and March (5mi).
