Seattle Weather In May
The highest recorded temperature for Seattle for the past 66 years in May was 92 degrees Fahrenheit, measured on May 20, 1963, and the regular high is 64. The record low May temperature in Seattle for the last 66 years was 35 on May 26, 1954, and the mean daily low in the month is 47.
According to National Weather Service Seattle May Weather data, on May 4, 1961, the recorded high temperature did not exceed 50 degrees Fahrenheit, the lowest high measured in Seattle in the past 66 years. Weather Service records additionally indicate that on May 27, 1972, the low for the day was not measured below 63 degrees, the highest low temperature recorded in Seattle in the last 66 years.
NWS data indicates that the daily high temperature in Seattle on May First averages 59 degrees Fahrenheit and the high on the last day of May averages 67 degrees. The average daily low temperature in Seattle on May First is 45 degrees Fahrenheit and the average low on the last day of May is 51 degrees.
Seattle usually receives an average of 1.78 inches of precipitation during May. May Seattle Weather records indicate that on May 25, 1968 Seattle received 0.76 inches of precipitation, the highest amount of rain recorded in a single day in May.