The official National Weather Service forecast for Harpswell Center — 43.8017°N, 69.9842°W, 8.2 miles from I-295. Forecasts here are written by NWS GYX, this county’s forecast office.
| Cumberland County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 31 | 34 | 42 | 55 | 66 | 74 | 80 | 79 | 71 | 59 | 47 | 36 | 56 |
| Avg low °F | 12 | 14 | 23 | 33 | 44 | 53 | 59 | 57 | 50 | 39 | 29 | 20 | 36 |
| Precip in | 3.4 | 3.2 | 4.0 | 4.4 | 3.9 | 4.5 | 3.9 | 3.7 | 3.8 | 5.4 | 4.1 | 4.6 | 48.9 |
1996–2025 normals for Cumberland County — the climate division Harpswell Center sits in. All-time county record high 100.9°F (1975-08-03); record low -24.4°F (1971-01-20). Source: NOAA / National Weather Service.