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
In September, the average high-temperature marginally drops from a warm 83.5°F (28.6°C) in August to a still moderately hot 75.4°F (24.1°C). Saint Charles's nighttime temperature in September falls to an average of 55.6°F (13.1°C).Humidity
In September, the average relative humidity is 63%.Rainfall
In Saint Charles, during September, the rain falls for 10.8 days and regularly aggregates up to 1.46" (37mm) of precipitation. Throughout the year, in Saint Charles, there are 109.3 rainfall days, and 19.41" (493mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Saint Charles.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 7:01 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 7:18 pm CDT.
Sunshine
In Saint Charles, the average sunshine in September is 8.7h.UV index
The average daily maximum UV index in September in Saint Charles is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: A maximum high UV index of 5 in September translates into the following recommendations:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Saint Charles?
What is the average humidity in September in Saint Charles?
How many days does it rain in September in Saint Charles?
When it does not snow in Saint Charles?
Does it snow in Saint Charles in September?
How many hours of daylight does Saint Charles have in September?
What time are sunrise and sunset in September in Saint Charles?
How many hours of sunshine does Saint Charles have in September?
How high is the UV index in September in Saint Charles?
Average temperature in September
Saint Charles, SD
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in September: 55.6°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 (17.2°F).
Average pressure in September
Saint Charles, 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
Saint Charles, SD
- Average wind speed in September: 10.5mph
The windiest month (with the highest average wind speed) is April (12.2mph).
The calmest month (with the lowest average wind speed) is July (9.3mph).
Average humidity in September
Saint Charles, SD
- Average humidity in September: 63%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is October (61%).
Average rainfall in September
Saint Charles, SD
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is May (3.03").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Saint Charles, SD
- Average rainfall days in September: 10.8 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (1.6 days).
Average snowfall in September
Saint Charles, SD
- Average snowfall in September: 0"
The month with the highest snowfall is December (3.66").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Saint Charles, SD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Saint Charles, 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 4min
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 54min).
Average sunshine days in September
Saint Charles, SD
- Average sunshine days in September: 16.7 days
The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is June (9.6 days).
Average UV index in September
Saint Charles, 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
Saint Charles, SD
- Average cloud cover in September: 25
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July, August and September (Cloud cover 25).
Average visibility in September
Saint Charles, 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).
Saint Charles, South Dakota, USA
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