September weather forecastSaint Stephen, MN
September
Weather in September
September, the first month of the autumn in Saint Stephen, is still a pleasant month, with temperature in the range of an average high of 70.2°F (21.2°C) and an average low of 51.3°F (10.7°C).Temperature
Saint Stephen in September undergoes a slight reduction in the average high-temperature, shifting from August's warm 77.9°F (25.5°C) to an agreeable 70.2°F (21.2°C). During the month of September, Saint Stephen's nighttime temperature lowers to an average of 51.3°F (10.7°C).Humidity
The average relative humidity in September is 74%.Rainfall
In September, the rain falls for 10.5 days. Throughout September, 1.14" (29mm) of precipitation is accumulated. In Saint Stephen, during the entire year, the rain falls for 107.2 days and collects up to 15.75" (400mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:54 pm. On the last day of September, sunrise is at 7:15 am and sunset at 6:58 pm CDT.
Sunshine
In Saint Stephen, the average sunshine in September is 8.7h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A maximum UV index of 4 in September translates into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Saint Stephen, MN
- Average high temperature in September: 70.2°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (18.5°F).
- Average low temperature in September: 51.3°F
The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (6.1°F).
Average pressure in September
Saint Stephen, MN
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Saint Stephen, MN
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is April (9.2mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in September
Saint Stephen, MN
- Average humidity in September: 74%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are April and May (70%).
Average rainfall in September
Saint Stephen, MN
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is June (2.72").
The driest month (with the least rainfall) is January (0.35").
Average rainfall days in September
Saint Stephen, MN
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is February (2.1 days).
Average snowfall in September
Saint Stephen, MN
- Average snowfall in September: 0"
The month with the highest snowfall is December (3.31").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Saint Stephen, MN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.8 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 Stephen, MN
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in September
Saint Stephen, MN
- Average sunshine days in September: 17.6 days
The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is June (12.6 days).
Average UV index in September
Saint Stephen, MN
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Saint Stephen, MN
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 67).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in September
Saint Stephen, MN
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
