Annual Weather Averages Near Grand Forks. Based on weather reports collected during 1985–2015. Averages are for Grand Forks International Airport, which is 7 miles from Grand Forks. You can jump to a separate table for each region of the state: Eastern , Central and Western South Dakota. The average humidity in September is listed below for places in North Dakota. Overnight temperatures drop below freezing between 1 and 8 times in September. Average Temperatures for South Dakota in September Average temperatures for September at cities, towns, parks and lakes throughout South Dakota are listed below in degrees Fahrenheit and Celsius. Number of Sunny Days. Bismarck, ND daily average and extreme temperature range for September. Each place has a total for the amount of precipitation it usually receives this month along with information on the number of days with wet weather. Get the latest coronavirus (COVID-19) updates for the USA with current travel advice, statistics and online resources.. Below are average maximum temperatures at popular destinations in North Dakota in September. Low Temperature During September the overnight temperature drops to an average of 44.3°F, with the lowest temperature of 10.9°F being recorded on September 30, 1974. This includes the days when cloud covers up to 30% of the sky during daylight hours. Average Weather in September in Williston North Dakota, United States. North Dakota weather in September 2021. The tables give daily averages along with highest and lowest relative humidity levels. Average Precipitation for North Dakota in September The tables below give monthly averages for rainfall plus snowfall during September at cities, towns and parks in North Dakota. In the table below, the average number of Sunny Days for a city in North Dakota is the total days this month when the sky is mostly clear. The average first measurable snow of the season for areas from western Nebraska into North Dakota, northern Minnesota and the Upper Peninsula of Michigan usually takes place in October. Average Weather in September in Medora North Dakota, United States. Average Weather during September in Bismarck (North Dakota), United States of America. The average minimum temperature (usually the minimum temperature is noted during the night) in Bismarck in September is 7.0°C (44.6°F). September, the first month of the autumn, in Fargo, is also an agreeable month, with average temperature ranging between max 70.9°F (21.6°C) and min 47.5°F (8.6°C). Temperature In September, the average high-temperature decreases, from a moderately hot 81.1°F (27.3°C) in August, to a pleasant 70.9°F (21.6°C).The average low-temperature, in September, is 47.5°F (8.6°C). 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