Hottest and Coldest Temperatures Ever in Washington DC on September 15

On September 15, Washington D.C. experienced varying temperatures throughout history. The hottest temperature ever recorded on this day occurred in 1998, reaching a scorching 93.0°F, while the coldest temperature occurred in 1964, reaching a chilly 50.0°F. On average, September 15 has a pleasant temperature of 71.24°F, with an average high of 75.65°F and an average low of 66.83°F. In 1998, the same year that saw the highest recorded temperature, Washington D.C. celebrated the opening of the Smithsonian National Air and Space Museum's Steven F. Udvar-Hazy Center, showcasing a remarkable collection of historic aircraft and space artifacts, delighting aviation enthusiasts and history buffs alike.