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
September indicates a minor shift in the average high-temperature, from August's moderately hot 82.4°F (28°C) to a still warm 76.1°F (24.5°C). Vermillion records a mean low-temperature of 54.9°F (12.7°C) in September.Humidity
In Vermillion, the average relative humidity in September is 69%.Rainfall
In September, the rain falls for 10.7 days. Throughout September, 1.85" (47mm) of precipitation is accumulated. In Vermillion, during the entire year, the rain falls for 116.6 days and collects up to 21.26" (540mm) of precipitation.Snowfall
June through September are months without snowfall in Vermillion.Daylight
The average length of the day in September in Vermillion is 12h and 29min.On the first day of September in Vermillion, sunrise is at 6:53 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:10 pm CDT.
Sunshine
The average sunshine in September in Vermillion is 8.9h.UV index
In September, the average daily maximum UV index in Vermillion is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. To guard against the harmful effects of the Sun, minimize exposure during midday. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
What are the temperatures in Vermillion in September?
What is the average humidity in September in Vermillion?
How much does it rain in Vermillion in September?
When it does not snow in Vermillion?
Does it snow in Vermillion in September?
How many hours of daylight does Vermillion have in September?
When is the sunrise / sunset in September in Vermillion?
How long on average sun shines in September in Vermillion?
What is the UV index reading in September in Vermillion?
Average temperature in September
Vermillion, SD
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (26.8°F).
- Average low temperature in September: 54.9°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (12.9°F).
Average pressure in September
Vermillion, 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
Vermillion, SD
- Average wind speed in September: 9.1mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in September
Vermillion, SD
- Average humidity in September: 69%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (65%).
Average rainfall in September
Vermillion, SD
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is June (3.35").
The driest months (with the least rainfall) are January and February (0.63").
Average rainfall days in September
Vermillion, SD
- Average rainfall days in September: 10.7 days
The month with the highest number of rainy days is June (17.3 days).
The months with the least rainy days are January and February (2.8 days).
Average snowfall in September
Vermillion, SD
- Average snowfall in September: 0"
The months with the highest snowfall are January and February (2.83").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Vermillion, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Vermillion, SD
- Average daylight in September: 12h and 3min
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 6min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
Vermillion, SD
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in September
Vermillion, SD
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Vermillion, SD
- Average cloud cover in September: 27
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in September
Vermillion, 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).
Vermillion, South Dakota, USA
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