September weather forecastGrand Forks, ND
September
Weather in September
September in Grand Forks brings the arrival of autumn with it. A crispness starts creeping into the weather, as the temperatures begin a gradual decline. The meteorological highlight of this month comes from a sudden drop in the high temperature from 80.6°F (27°C) to 70.7°F (21.5°C). Compared to August, the daylight decreases substantially, and the humidity balance remains stable. Despite these changes, the city continues to bask in ample sunshine, lending itself to arresting autumnal landscapes.Temperature
Grand Forks's progression into September involves a drop in the average high-temperature, receding from a warm 80.6°F (27°C) in August to an agreeable 70.7°F (21.5°C). Grand Forks in September anticipates an average nighttime temperature of 51.6°F (10.9°C).Humidity
In Grand Forks, the average relative humidity in September is 62%.Rainfall
In Grand Forks, in September, it is raining for 7.7 days, with typically 0.91" (23mm) of accumulated precipitation. Throughout the year, there are 80.3 rainfall days, and 10.47" (266mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Grand Forks, North Dakota.Daylight
In Grand Forks, North Dakota, the average length of the day in September is 12h and 34min.On the first day of September in Grand Forks, sunrise is at 6:47 am and sunset at 8:08 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 7:08 pm CDT.
Sunshine
In Grand Forks, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grand Forks, ND
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is August (80.6°F).
The month with the lowest average high temperature is January (15.3°F).
- Average low temperature in September: 51.6°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (0.9°F).
Average pressure in September
Grand Forks, ND
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in September
Grand Forks, ND
- Average wind speed in September: 9.8mph
The windiest month (with the highest average wind speed) is October (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (8.2mph).
Average humidity in September
Grand Forks, ND
- Average humidity in September: 62%
The months with the highest relative humidity are January and February (91%).
The month with the lowest relative humidity is August (60%).
Average rainfall in September
Grand Forks, ND
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is June (1.89").
The driest month (with the least rainfall) is January (0.24").
Average rainfall days in September
Grand Forks, ND
- Average rainfall days in September: 7.7 days
The month with the highest number of rainy days is June (14.1 days).
The month with the least rainy days is January (0.8 days).
Average snowfall in September
Grand Forks, ND
- Average snowfall in September: 0"
The month with the highest snowfall is December (2.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Grand Forks, ND
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grand Forks, ND
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in September
Grand Forks, ND
- Average sunshine days in September: 21.4 days
The month with the most sunshine days is January (21.5 days).
The month with the least sunshine days is June (13.7 days).
Average UV index in September
Grand Forks, ND
- 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
Grand Forks, ND
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
Grand Forks, ND
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
