Hottest and Coldest Temperatures Ever in Washington DC on September 20

On September 20th in Washington D.C., temperature extremes have been recorded throughout the years. The hottest temperature of 91.0°F occurred back in 1965, while the coldest temperature of 46.0°F was experienced more recently in 2020. On average, this date sees a temperature of 69.29°F, with a high of 74.03°F and a low of 64.56°F. Looking back to 1965, an interesting news item to note is that on September 20th, the first-ever warehouse-style superstore, called the "Giant Open Air Discount Outlet," opened its doors in Washington D.C.