September weather forecastDelmont, SD
September
Weather in September
The first month of the autumn, September, is still a warm month in Delmont, South Dakota, with temperature in the range of an average low of 55.2°F (12.9°C) and an average high of 76.3°F (24.6°C).Temperature
In September, the meteorological conditions change slightly, with the average high-temperature moving from a warm 84.4°F (29.1°C) in August to a still moderately hot 76.3°F (24.6°C). Nightly temperatures drop to an average low of 55.2°F (12.9°C) in September.Humidity
In Delmont, the average relative humidity in September is 64%.Rainfall
In Delmont, in September, it is raining for 11.7 days, with typically 1.5" (38mm) of accumulated precipitation. In Delmont, during the entire year, the rain falls for 106.8 days and collects up to 19.29" (490mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In Delmont, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:57 am and sunset at 8:07 pm. On the last day of September, sunrise is at 7:29 am and sunset at 7:14 pm CDT.
Sunshine
The average sunshine in September in Delmont is 8.8h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 5 during September translates into these guidelines:
Adopt protective measures - It is advised to guard against sun damage. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Delmont, SD
- Average high temperature in September: 76.3°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (26.2°F).
- Average low temperature in September: 55.2°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (12.2°F).
Average pressure in September
Delmont, SD
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Delmont, SD
- Average wind speed in September: 9.6mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (8.5mph).
Average humidity in September
Delmont, SD
- Average humidity in September: 64%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (63%).
Average rainfall in September
Delmont, SD
- Average rainfall in September: 1.5"
The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is February (0.51").
Average rainfall days in September
Delmont, SD
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is June (15.8 days).
The month with the least rainy days is January (2.5 days).
Average snowfall in September
Delmont, SD
- Average snowfall in September: 0"
The month with the highest snowfall is December (2.56").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Delmont, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (7.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Delmont, SD
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- 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: 4h and 30min).
Average sunshine days in September
Delmont, SD
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is November (22.8 days).
The month with the least sunshine days is June (11.8 days).
Average UV index in September
Delmont, SD
- Average UV index in September: 5
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
Delmont, SD
- Average cloud cover in September: 26
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 23).
Average visibility in September
Delmont, 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).
