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
The commencement of September indicates a gentle shift in the average high-temperature, receding from August's 81.7°F (27.6°C) to a still moderately hot 74.7°F (23.7°C). Marion's average low-temperature during September nights is observed to be a cool 54°F (12.2°C).Humidity
In Marion, South Dakota, the average relative humidity in September is 70%.Rainfall
In September, in Marion, the rain falls for 10.5 days. Throughout September, 1.61" (41mm) of precipitation is accumulated. Throughout the year, in Marion, South Dakota, there are 111.7 rainfall days, and 17.76" (451mm) of precipitation is accumulated.Snowfall
In Marion, snow does not fall in June through September.Daylight
The average length of the day in September in Marion, South Dakota, is 12h and 29min.On the first day of September in Marion, sunrise is at 6:53 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:11 pm CDT.
Sunshine
The average sunshine in September in Marion is 8.8h.UV index
In September, the average daily maximum UV index in Marion is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 4 during September translates into the following recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Frequently asked questions
What are September temperatures in Marion?
What is the average humidity in September in Marion?
How many days does it rain in September in Marion?
When it does not snow in Marion?
Does it snow in Marion in September?
What is the average length of the day in September in Marion?
When is the sunrise / sunset in September in Marion?
How long on average sun shines in September in Marion?
How high is the UV index in September in Marion?
Average temperature in September
Marion, SD
- Average high temperature in September: 74.7°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in September: 54°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).
Average pressure in September
Marion, SD
- Average pressure in September: 29.98"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
Marion, SD
- Average wind speed in September: 9.3mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.9mph).
Average humidity in September
Marion, SD
- Average humidity in September: 70%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (66%).
Average rainfall in September
Marion, SD
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is June (2.91").
The driest months (with the least rainfall) are January, February and November (0.47").
Average rainfall days in September
Marion, SD
- Average rainfall days in September: 10.5 days
The months with the highest number of rainy days are May and June (16 days).
The month with the least rainy days is February (2.5 days).
Average snowfall in September
Marion, SD
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.64").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Marion, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Marion, SD
- Average daylight in September: 12h and 3min
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 5min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in September
Marion, SD
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is June (11.5 days).
Average UV index in September
Marion, SD
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in September
Marion, SD
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in September
Marion, 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).
Marion, South Dakota, USA
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