Albeit a humidity of 68%, marks a good time to explore the best things to do in Mt Rushmore. Daytime temperatures usually reach 23°C in Sioux Falls, South Dakota in September, falling to 9°C at night. We will be driving from Salt Lake City area. May Weather Today/Tomorrow ; Hour-by-Hour Forecast ; 14 Day Forecast ; Yesterday/Past Weather; ... September Climate & Weather Averages in Rapid City. The average minimum temperature (usually the minimum temperature is noted during the night) in Pierre in September is 9.6°C (49.28°F). Weather in September The first month of the autumn, September, is still a warm month in Spearfish, South Dakota, with temperature in the range of an average low of 48.7°F (9.3°C) and an average high of 74.7°F (23.7°C). The first month of the autumn, September, is still a pleasant month in Deadwood, South Dakota, with temperature in the range of an average low of 42.1°F (5.6°C) and an average high of 70°F (21.1°C). The average high during this season is between 35.6°F (2°C) and 29.4°F (-1.4°C). There are normally 9 hours of bright sunshine each day in Pierre in September - that's 69% of daylight hours. The average low-temperature, in September, is 43.3°F (6.3°C). Get the monthly weather forecast for Spearfish, SD, including daily high/low, historical averages, to help you plan ahead. Weather in Spearfish, South Dakota. Jan Select a month to view South Dakota sunrise & sunset times for the next twelve months. September temperatures: daily averages. Low Temp: 48 °F. Relative humidity measures the actual amount of moisture in the air as a percentage of the maximum amount of moisture the air can hold. Average Weather in September in Sioux Falls South Dakota, United States. Free Long Range Weather Forecast for Rapid City, South Dakota. Below are average maximum temperatures at popular destinations in South Dakota in September. Mt Rushmore Weather in June-August: If you are contemplating the best time to visit Mt Rushmore, this period fits the bill just right. The amount of rain in September is normal with an average of 47mm (1.9in). Home | Privacy & Cookies | Contact | About. The most pleasant months of the year for Spearfish are June, September and August. Temperature In September, the average high-temperature drops, from a moderately hot 80.1°F (26.7°C) in August, to a pleasant 70°F (21.1°C).In September, the average low-temperature is 42.1°F (5.6°C). The most pleasant months of the year for South Dakota are June, September and August. Daily high temperatures decrease by 11°F, from 79°F to 68°F, rarely falling below 54°F or exceeding 89°F.. Daily low temperatures decrease by 13°F, from 58°F to 46°F, rarely falling below 33°F or exceeding 68°F.. For reference, on July 18, the hottest day of the year, temperatures in Sioux Falls typically range from … Mean Temp: 62 °F. Place. Get the monthly weather forecast for Deadwood, SD, including daily high/low, historical averages, to help you plan ahead. Aug Average Temperatures for North Dakota in September. The weather is nice and sultry with the lowest temperature being around 37℉ and the warmest being a usual 90℉. The South Dakota sunrise & sunset times shown below are for Sioux Falls. Mar How hot is it in South Dakota in September? National Climatic Data Center. 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Climate & Weather Averages in Rapid City, South Dakota, USA. Weather is far too cold this time of year in South Dakota to be enjoyable for warm weather travelers. Weather Rapid City, South Dakota, USA. The September weather guide for South Dakota shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Apr high of 47˚ with a low of 23˚. Enter to win a $500 travel voucher to customize your perfect vacation to the Black Hills … Daily high temperatures decrease by 14°F, from 80°F to 67°F, rarely falling below 50°F or exceeding 92°F.. Daily low temperatures decrease by 11°F, from 55°F to 44°F, rarely falling below 33°F or exceeding 64°F.. For reference, on July 26, the hottest day of the year, temperatures in Sturgis typically range from 61°F to … Eastern North Dakota. You can jump to a separate table for each region of the state: Eastern, Central and Western South Dakota. High °C. Daytime temperatures usually reach 23°C in Sioux Falls, South Dakota in September, falling to 9°C at night. Temperature In Custer, the average high-temperature in September slightly decreases, from a warm 78.8°F (26°C) in August, to an agreeable 70.2°F (21.2°C). In Keystone, in September , during 8 rainfall days , 1.3" (32mm) of precipitation is typically accumulated. There are usually 8 days with some rain in Sioux Falls, South Dakota in September and the average monthly rainfall is 74mm. … First Choice  FloridaTix  Hoseasons  James Villas  Jet2.com  Jet2holidays  Love Holidays  On the Beach  Rail Europe - formerly Loco2  RHS  Saga Holidays  TUI  Virgin Atlantic  VRBO (formerly HomeAway)  More... We help you find the best travel deals for your holiday in the sun by sharing tips on when and where to go, before providing you with top discounts. Metric (°C / mm)  |  Imperial (°F / inches), Get your weekly fix of holiday inspiration from some of the world's best travel writers plus save on your next trip with the latest exclusive offers. Rapid City's weather typically falls in the middle between towns like Custer and Lead, which sit in the highest elevations, to Spearfish and Hot Springs. There are usually 6 days with some rain in Pierre in September and the average monthly rainfall is 32mm . ... September: 23: 10: 59: 38: October: 15: 3: 46: 28: November: 8-3: 37: 18: December: 3-8: 59: 37: Year: 15: 3: Days of Hot Weather in Rapid City. Calendar overview of Months Weather Forecast. Does it rain in Pierre in September? There are normally 8 hours of bright sunshine each day in Sioux Falls, South Dakota in September - that's 64% of daylight hours. Feb July is the hottest month for Spearfish with an average high temperature of 87.6°, which ranks it as warmer than most places in South Dakota. 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