September weather forecastMadison, SD
September
Weather in September
September brings the onset of autumn to Madison, South Dakota with relatively cooler weather. Temperatures start to decrease, with night-time bringing a noticeable coolness. Precipitation further decreases, creating optimal conditions for exploring the city's parks and gardens adorned with fall foliage. As summer transitions into autumn, September paints Madison in hues of russet and gold. September's weather proffers ideal conditions to witness the changes and subtle shifts in nature's palette.Temperature
As Madison enters September, the average high-temperature subtly lowers from the a warm 81°F (27.2°C) of August to a pleasant 73°F (22.8°C). In Madison, the average temperature during the nights of September drops to a cool 52.7°F (11.5°C).Humidity
In September, the average relative humidity is 69%.Rainfall
In September, the rain falls for 10.4 days. Throughout September, 1.61" (41mm) of precipitation is accumulated. Throughout the year, there are 111.2 rainfall days, and 21.14" (537mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 29min.On the first day of September, sunrise is at 6:52 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 7:10 pm CDT.
Sunshine
In September, the average sunshine is 8.7h.UV index
In Madison, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum UV index of 4 during September translates into these guidelines:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Madison, SD
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (22.3°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (8.1°F).
Average pressure in September
Madison, SD
- Average pressure in September: 29.97"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Madison, SD
- Average wind speed in September: 9.9mph
The windiest month (with the highest average wind speed) is April (11.6mph).
The calmest months (with the lowest average wind speed) are July and August (8.6mph).
Average humidity in September
Madison, SD
- Average humidity in September: 69%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is October (67%).
Average rainfall in September
Madison, SD
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is June (3.23").
The driest month (with the least rainfall) is November (0.59").
Average rainfall days in September
Madison, SD
- Average rainfall days in September: 10.4 days
The month with the highest number of rainy days is June (18.7 days).
The month with the least rainy days is January (1.6 days).
Average snowfall in September
Madison, SD
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Madison, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Madison, SD
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Madison, SD
- Average sunshine days in September: 18 days
The month with the most sunshine days is November (22.4 days).
The month with the least sunshine days is June (9.5 days).
Average UV index in September
Madison, 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 December (UV index 1).
Average cloud cover in September
Madison, SD
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Madison, 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).
