Portland Weather In May
The highest recorded temperature for Portland Maine for the past 70 years in May was 100 degrees Fahrenheit, most recently encountered on May 28, 1983, while the regular high temperature is 63. The lowest documented temperature in May for Portland for the past 70 years was 29 on May 1, 1954, while the mean low daily temperature during the month is 44.
According to National Weather Service Portland May Weather data, on May 3, 1952, the recorded high temperature did not exceed 60 degrees Fahrenheit, the lowest high measured in Portland in the past 70 years. Weather Service data also shows that on May 31, 1986, the lowest recorded temperature for the day did not drop below 62 degrees, the highest low measured temperature in Portland in the last 70 years.
National Weather Service records indicate that the high temperature in Portland on May First averages 44 degrees and the high on the last day of the month averages 39 degrees. The low recorded temperature in Portland on May First averages 32 degrees Fahrenheit and the low temperature on the final day of May averages 27 degrees.
Portland receives an average of 3.82 inches of precipitation during May. The most rain recorded in a single day, as shown by May Portland Weather data, was 10.28 inches on May 30, 1956. Portland averages 0.2 inches of snow in May. The highest snowfall on a single day in May was 0.5 inches on May 8, 1953.