Maine weather in September
The state broadly agrees with itself in September: afternoons run 71° in Portland, Maine and 71° in Bar Harbor, 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 71°, nights around 52°, and 3.8 in of rain in a typical September.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Portland, Maine | 71° / 52° | 5 | The month that makes up for February. |
Downeast
Highs near 71°, nights around 53°, and 4.2 in of rain in a typical September.
| Place | Highs / lows | Wet days | The short version |
|---|---|---|---|
| Bar Harbor | 71° / 53° | 7 | Cruise ships in, families gone, hiking at its very best. |
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.