September weather forecastNemo, SD
September
Weather in September
September, the first month of the autumn in Nemo, is still a warm month, with an average temperature fluctuating between 73.8°F (23.2°C) and 53.4°F (11.9°C).Temperature
September signifies a gentle decline in Nemo's average high-temperature, easing from 82.6°F (28.1°C) in August to a still moderately hot 73.8°F (23.2°C). During the nights in September, Nemo experiences a consistent average temperature of 53.4°F (11.9°C).Humidity
The months with the lowest humidity are August and September, with an average relative humidity of 49%.Rainfall
In September, the rain falls for 9 days. Throughout September, 0.83" (21mm) of precipitation is accumulated. In Nemo, during the entire year, the rain falls for 126.3 days and collects up to 16.77" (426mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows in Nemo. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Nemo, during the entire year, snow falls for 62.1 days and aggregates up to 36.26" (921mm) of snow.Daylight
In September, the average length of the day in Nemo, South Dakota, is 12h and 30min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:29 pm. On the last day of September, in Nemo, sunrise is at 6:51 am and sunset at 6:35 pm MDT.
Sunshine
The average sunshine in September is 10.4h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: In September, a daily UV index of 4 turns into the following recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Nemo, SD
- Average high temperature in September: 73.8°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (32.2°F).
- Average low temperature in September: 53.4°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is February (18°F).
Average pressure in September
Nemo, 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
Nemo, SD
- Average wind speed in September: 9.1mph
The windiest month (with the highest average wind speed) is October (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (8.3mph).
Average humidity in September
Nemo, SD
- Average humidity in September: 49%
The month with the highest relative humidity is January (77%).
The months with the lowest relative humidity are August and September (49%).
Average rainfall in September
Nemo, SD
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is May (2.52").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in September
Nemo, SD
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is December (5.8 days).
Average snowfall in September
Nemo, SD
- Average snowfall in September: 0.04"
The month with the highest snowfall is April (8.23").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Nemo, SD
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (12.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Nemo, SD
- Average daylight in September: 12h and 30min
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 24min
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 54min).
Average sunshine days in September
Nemo, SD
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (9.4 days).
Average UV index in September
Nemo, SD
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Nemo, SD
- Average cloud cover in September: 18
The months with the most cloud cover are February and April (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Nemo, 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).
