Washington Weather In September
The hottest September day in Washington for the past 105 years was 98 degrees Fahrenheit, most recently measured on September 22, 1965, while the typical high temperature is 79. The coldest day reported in Washington in September for the past 105 years was 27 most recently registered on September 2, 1963, while the typical low recorded temperature is 56.
US National Weather Service historical Washington September Weather data records that on September 28, 1956, the high temperature did not exceed 52 degrees Fahrenheit, the lowest high measured in Washington in the past 105 years. NWS data also shows that on September 30, 1979, the lowest measured temperature on that day did not drop below 70 degrees, the highest low temperature measured in Washington in the last 105 years.
Historical weather data accumulated by the National Weather Service shows that the average daily high temperature in Washington on September First is 85 degrees Fahrenheit and the average high on the last day of September is 72 degrees. The low recorded temperature in Washington on September First averages 58 degrees Fahrenheit and the low temperature on the final day of September averages 47 degrees.
Washington usually receives an average of 3.82 inches of rain during September. The most precipitation recorded on a single day in September, according to September Washington Weather data, was 3.3 inches on September 11, 1968.