These predictions are probabilities for the month of september from weather reports for over 10 years. The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds. Low °C. The month with the highest UV index is July (UV index 10). While towns in South Dakota, North Dakota, Wyoming and Minnesota make the lists for some of the nation's coldest; not one from the Black Hills is included or close to. The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. Average Temperatures for South Dakota in October Average temperatures for October at cities, towns, parks and lakes throughout South Dakota are listed below in degrees Fahrenheit and Celsius. There are usually 6 days with some rain in Pierre in September and the average monthly rainfall is 32mm . Weather in South Africa in september 2021. Torrential rainfall in parts of South Dakota flooded homes, washed out roads and canceled classes in at least 20 school districts on Friday. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night. The September weather guide for Custer, South Dakota shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & … Tonight the winds will die down, and the sky will be mostly clear as the cloud deck finally moves east. Average Weather in September in Rapid City South Dakota, United States Daily high temperatures decrease by 14°F , from 82°F to 68°F , rarely falling below 52°F or exceeding 93°F . The weather is better from the previous month since in september it receives an average of 2.6in of precipitation over 6 days. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database . The averages from 1981 to 2010 are the latest available data; these numbers are updated every 10 years. For reference, on July 26, the hottest day of the year, temperatures in Rapid City typically range from 62°F to 87°F, while on January 1, the coldest day of the year, they range from 17°F to 35°F. December 2020 Long Range Weather Forecast for High Plains; Dates Weather Conditions; Dec 1-2: Sunny, mild: Dec 3-9: Snowy periods, very cold: Dec 10-17: Sunny, mild: Dec 18-23: Rain and snow showers, mild: Dec 24-31: Snowy periods, cold: December: temperature 29° (1° below avg.) The percentage of time spent in various temperature bands. The average hourly temperature, color coded into bands. Weather forecast in mobile app. Annual Weather Averages in Sioux Falls Based on weather reports collected during 1985–2015. The average daily incident shortwave solar energy in Rapid City is decreasing during September, falling by 1.4 kWh, from 5.9 kWh to 4.4 kWh, over the course of the month. The growing season in Rapid City typically lasts for 5.0 months (153 days), from around May 4 to around October 4, rarely starting before April 14 or after May 22, and rarely ending before September 13 or after October 23. According to data from the National Weather Service, Tuesday also marked the first time a South Dakota tornado has touched down in September in at least the past 20 years. For reference, the year's highest daily chance of a wet day is 37% on June 5, and its lowest chance is 3% on January 16. The solar day over the course of September. MERRA-2 Modern-Era Retrospective Analysis. Months with the lowest snowfall are June, July and August (0mm). The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. Today’s and tonight’s Rapid City, SD weather forecast, weather conditions and Doppler radar from The Weather Channel and Weather.com Get the monthly weather forecast for Mount Rushmore Ut, SD, including daily high/low, historical averages, to help you plan ahead. Daily low temperatures decrease by 11°F, from 56°F to 44°F, rarely falling below 34°F or exceeding 65°F. Access hourly, 10 day and 15 day forecasts along with up to the minute reports and videos from AccuWeather.com The thin dotted line is the corresponding average liquid-equivalent snowfall. In South Dakota, there are 3 comfortable months with high temperatures in the range of 70-85°. Free Long Range Weather Forecast for Rapid City, South Dakota September 2021. The warmest month (with the highest average high temperature) is July (26.6°C). The month with the lowest number of rainy days is January (3.4 days). For reference, on July 18, the muggiest day of the year, there are muggy conditions 3% of the time, while on September 24, the least muggy day of the year, there are muggy conditions 0% of the time. Low; Thu 12/17: Partly sunny: 39°F: 39°F: Fri 12/18: Cloudy: 41°F All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus. South Dakota sd, Weather 30 Day. South Dakota, the 17th largest state in the nation, covers so much area that it has several different geographic areas, each with its own weather pattern. Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. 76. Date Weather Pre. Road Conditions. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . Weather History for Places in South Dakota . The month with shortest days is December (Average daylight: 9h). The variety of trees in South Dakota become color-changing canvases in the autumn. Relative humidity measures the actual amount of moisture in the air as a percentage of the maximum amount of moisture the air can hold. Custer Weather Forecasts. In Rapid City, the chance of a wet day over the course of September is essentially constant, remaining around 15% throughout. Months with least sunshine are November and December (Average sunshine: 5). Monthly temperature, precipitation and hours of sunshine. The shaded overlays indicate night and civil twilight. Visitors make foliage pilgrimages to places like Spearfish Canyon and Sica Hollow State Park to take in the gorgeous transition. There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Rapid City. You can jump to a separate table for each region of the state: Eastern , Central and Western South Dakota. The average accumulated growing degree days in Rapid City are increasing during September, increasing by 360°F, from 2,200°F to 2,560°F, over the course of the month. The topography within 2 miles of Rapid City contains significant variations in elevation, with a maximum elevation change of 689 feet and an average elevation above sea level of 3,334 feet. Does it rain in Pierre in September? The month with the highest snowfall is March (304.8mm). 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