Climate in Portland: average temperature by month
In Portland the warmest month is July, with 27.3 °C on average in the afternoon; the coolest is January, with 0.1 °C.
The average of the weather stations Gardiner (73 km), Nashua (138 km) and Blue Hill Coop (175 km); nearer ones count more.
| Month | Average high | Coolest to warmest day |
|---|---|---|
| January | 0.1 °C | -0.3 °C – 0.9 °C |
| February | 1.4 °C | 0.1 °C – 3.3 °C |
| March | 6.1 °C | 3.4 °C – 8.9 °C |
| April | 12.7 °C | 9.2 °C – 15.6 °C |
| May | 19.4 °C | 15.9 °C – 22.0 °C |
| June | 24.2 °C | 22.1 °C – 26.4 °C |
| July | 27.3 °C | 26.5 °C – 27.7 °C |
| August | 26.5 °C | 25.0 °C – 27.5 °C |
| September | 22.4 °C | 19.5 °C – 24.9 °C |
| October | 16.0 °C | 12.7 °C – 19.4 °C |
| November | 8.9 °C | 5.5 °C – 12.5 °C |
| December | 2.6 °C | 1.1 °C – 5.2 °C |