Maine weather in May
The state broadly agrees with itself in May: afternoons run 65° in Bar Harbor and 64° in Portland, Maine, with everywhere else in between.
Based on 2 weather stations. Two stations, both on the coast — the North Woods interior gets a longer, colder winter than either of these.
Southern Coast
Highs near 64°, nights around 46°, and 3.7 in of rain in a typical May.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Portland, Maine | 64° / 46° | 7 | Green arrives all at once; the ocean stays unconvinced. |
Downeast
Highs near 65°, nights around 45°, and 4.5 in of rain in a typical May.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Bar Harbor | 65° / 45° | 8 | Everything reopens — and so do the blackflies. |
Each place above has its own page for the full story — what the month feels like, what to pack, and whether the timing is right.