The official National Weather Service forecast for Willimantic — 45.3067°N, 69.4084°W, 33.3 miles from I-95. Forecasts here are written by NWS CAR, this county’s forecast office.
| Piscataquis County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 23 | 26 | 36 | 49 | 63 | 71 | 76 | 75 | 68 | 54 | 40 | 29 | 51 |
| Avg low °F | 4 | 5 | 15 | 28 | 39 | 49 | 55 | 53 | 45 | 35 | 25 | 13 | 30 |
| Precip in | 3.0 | 2.6 | 3.1 | 3.5 | 3.7 | 4.6 | 4.3 | 4.0 | 3.8 | 4.8 | 3.6 | 4.2 | 45.2 |
1996–2025 normals for Piscataquis County — the climate division Willimantic sits in. All-time county record high 95.7°F (1975-08-03); record low -36.5°F (1962-02-02). Source: NOAA / National Weather Service.