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. 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. 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. Average Weather in September in Williston North Dakota, United States. Averages are for Grand Forks International Airport, which is 7 miles from Grand Forks. The average minimum temperature (usually the minimum temperature is noted during the night) in Bismarck in September is 7.0°C (44.6°F). 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. 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. Average Weather during September in Bismarck (North Dakota), United States of America. Average Weather in September in Medora North Dakota, United States. The average humidity in September is listed below for places in North Dakota. 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. Annual Weather Averages Near Grand Forks. The amount of rain in September is normal with an average … 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). Based on weather reports collected during 1985–2015. 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. Select a destination to see more weather … Relative humidity measures the actual amount of moisture in the air as a percentage of the maximum amount of moisture the air can hold. North Dakota weather in September 2021. 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). You can jump to a separate table for each region of the state: Eastern , Central and Western South Dakota. Bismarck, ND daily average and extreme temperature range for September. This includes the days when cloud covers up to 30% of the sky during daylight hours. The tables give daily averages along with highest and lowest relative humidity levels. Number of Sunny Days. 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