Portland Weather In May

The highest recorded temperature in May for Portland Maine for the past 70 years was 96 degrees Fahrenheit, on May 31, 1937, while the standard high temperature is 63. The lowest documented temperature in May for Portland for the past 70 years was 23 most recently encountered on May 25, 1956, while the mean low daily temperature during the month is 44.

According to National Weather Service Portland May Weather data, on May 9, 1966, the recorded high temperature did not exceed 38 degrees Fahrenheit, the lowest high measured in Portland in the past 70 years. Weather Service data also shows that on May 2, 1930, the lowest recorded temperature for the day did not drop below 67 degrees, the highest low measured temperature in Portland in the last 70 years.

According to the National Weather Service, the high temperature in Portland in May on the first day of the month averages 59 degrees and the high on the last day of the month averages 68 degrees. The low measured temperature in Portland on May First averages 39 degrees and the low on the last day of the month averages 48 degrees.

Portland normally receives an average of 3.82 inches of rain during May. The most precipitation measured in a single day, as indicated by May Portland Weather data, was 3.49 inches on May 5, 1922. Portland receives an average of 0.2 inches of snow in May.On May 11, 1945 Portland received 5 inches of precipitation, the highest snowfall recorded in a single day in May.