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
Flandreau's September weather shows a modest shift in high-temperatures, falling from August's warm 79.9°F (26.6°C) to a pleasant 72.5°F (22.5°C). Throughout September, the nighttime temperature in Flandreau, South Dakota, averages to a cool 52.3°F (11.3°C).Humidity
In September, the average relative humidity is 70%.Rainfall
In Flandreau, in September, it is raining for 10.2 days, with typically 1.61" (41mm) of accumulated precipitation. Throughout the year, in Flandreau, there are 113.8 rainfall days, and 20.59" (523mm) of precipitation is accumulated.Snowfall
In Flandreau, South Dakota, snow does not fall in June through September.Daylight
The average length of the day in September in Flandreau is 12h and 29min.On the first day of the month, sunrise is at 6:50 am and sunset at 8:01 pm. On the last day of September, in Flandreau, sunrise is at 7:23 am and sunset at 7:08 pm CDT.
Sunshine
The average sunshine in September is 8.8h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Frequently asked questions
What is the average September temperature in Flandreau?
What is the average humidity in September in Flandreau?
How many days does it rain in September in Flandreau?
When it does not snow in Flandreau?
Does it snow in Flandreau in September?
How many hours of daylight does Flandreau have in September?
What time are sunrise and sunset in September in Flandreau?
How long on average sun shines in September in Flandreau?
How high is the UV index in September in Flandreau?
Average temperature in September
Flandreau, SD
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (21.6°F).
- Average low temperature in September: 52.3°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (7.7°F).
Average pressure in September
Flandreau, SD
- Average pressure in September: 29.98"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Flandreau, SD
- Average wind speed in September: 9.8mph
The windiest month (with the highest average wind speed) is April (11.6mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).
Average humidity in September
Flandreau, SD
- Average humidity in September: 70%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (68%).
Average rainfall in September
Flandreau, SD
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is June (3.15").
The driest months (with the least rainfall) are January and November (0.63").
Average rainfall days in September
Flandreau, SD
- Average rainfall days in September: 10.2 days
The month with the highest number of rainy days is June (17.6 days).
The month with the least rainy days is February (2.4 days).
Average snowfall in September
Flandreau, SD
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Flandreau, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Flandreau, 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 30min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Flandreau, SD
- Average sunshine days in September: 17.6 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in September
Flandreau, 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, November and December (UV index 1).
Average cloud cover in September
Flandreau, 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 29).
Average visibility in September
Flandreau, 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).
Flandreau, South Dakota, USA
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