Walla Walla Weather In September
The hottest September day in Walla Walla for the past 60 years was 104 degrees Fahrenheit, most recently encountered on September 2, 1950, while the normal high temperature is 79. The lowest documented temperature for Walla Walla for the past 60 years in September was 32 most recently encountered on September 28, 1985, and the normal low daily temperature is 53.
US National Weather Service Walla Walla September Weather data records that on September 23, 1984, the high temperature did not exceed 46 degrees Fahrenheit, the lowest high measured in Walla Walla in the past 60 years. The Weather Service additionally indicates that on September 1, 1987, the low for the day did not drop below 73 degrees, the highest low recorded in Walla Walla in the last 60 years.
According to the National Weather Service, the high temperature in Walla Walla in September on the first day of the month averages 83 degrees and the high on the last day of the month averages 73 degrees. The average daily low temperature in Walla Walla on September First is 57 degrees Fahrenheit and the average low on the last day of September is 48 degrees.
Walla Walla usually receives an average of 0.83 inches of precipitation during the month. The most rain recorded in a single day, as shown by September Walla Walla Weather data, was 1.34 inches on September 28, 1962.