Maine has mild summers and cold, snowy winters: NOAA's 1991–2020 normals for Portland International Jetport give highs of 78.7–79.5°F in July and August and 32.4°F in January, with 18.6 inches of snow in January and October the wettest month at 5.25 inches. Bangor, inland, runs colder in winter. Choose by activity; we have no verified dataset for crowds, foliage timing or prices.
Month-by-month climate table
| Month | Normal high | Normal low | Normal precipitation | Normal snowfall | Verified notes |
|---|---|---|---|---|---|
| January | 32.4°F | 15.6°F | 3.50 in | 18.6 in | — |
| February | 35.0°F | 17.3°F | 3.54 in | 16.6 in | — |
| March | 42.3°F | 26.0°F | 4.08 in | 13.6 in | — |
| April | 53.8°F | 35.4°F | 4.41 in | 2.8 in | — |
| May | 64.2°F | 45.5°F | 3.67 in | 0.0 in | Cadillac Summit Road reservations start May 20 (2026) |
| June | 73.6°F | 55.0°F | 4.15 in | 0.0 in | — |
| July | 79.5°F | 61.2°F | 3.43 in | 0.0 in | — |
| August | 78.7°F | 59.7°F | 3.57 in | 0.0 in | — |
| September | 71.1°F | 52.1°F | 3.77 in | 0.0 in | — |
| October | 59.5°F | 41.0°F | 5.25 in | 0.2 in | Cadillac Summit Road reservations end Oct 25 (2026) |
| November | 48.4°F | 31.7°F | 4.25 in | 2.3 in | — |
| December | 38.3°F | 22.4°F | 4.50 in | 14.6 in | — |
Source: NOAA NCEI U.S. Climate Normals 1991–2020, Portland International Jetport (USW00014764), retrieved October 20, 2026. Normals are 30-year averages; actual weather varies. Notes are from the National Park Service.
Portland vs Bangor
| Station | January high / low | July high / low | Wettest month | Peak snowfall |
|---|---|---|---|---|
| Portland | 32.4°F / 15.6°F | 79.5°F / 61.2°F | October (5.25 in) | 18.6 in (January) |
| Bangor | 28.1°F / 9.0°F | 80.4°F / 58.6°F | October (4.58 in) | 18.6 in (January) |
How to choose your month
- Warmest: June–August (Portland highs 73.6–79.5°F).
- Coldest: December–February (Portland highs 32.4–38.3°F).
- Snowiest: January (18.6 inches) and February (16.6).
Limits of this guide
Normals describe typical conditions, not forecasts, and we have no verified dataset for foliage, event dates, crowds or prices by month, so this page makes no such claims. Use the National Weather Service for forecasts.