Typical Weather

Weather in Portland in May

How warm is it in Portland in May?

In May the typical daytime high in Portland is 19.4 °C on average, from 15.9 °C at the start to 22.0 °C at the end of the month.

That is 6.6 °C warmer than in April and 4.9 °C cooler than in June.

The last 10 years were 0.4 °C warmer than more than 40 years ago.

Click a day for more: afternoon and night, the usual range, records and how fast it is warming.

The average of the weather stations Gardiner (73 km), Nashua (138 km) and Blue Hill Coop (175 km); nearer ones count more.