The official National Weather Service forecast for South Berwick — 43.2345°N, 70.8095°W, population 5,584, 9.2 miles from I-95. Forecasts here are written by NWS GYX, this county’s forecast office.
| York County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 35 | 43 | 55 | 67 | 75 | 81 | 79 | 72 | 60 | 48 | 37 | 57 |
| Avg low °F | 14 | 15 | 23 | 33 | 44 | 53 | 59 | 57 | 50 | 39 | 29 | 20 | 36 |
| Precip in | 3.6 | 3.4 | 4.2 | 4.5 | 4.0 | 4.5 | 4.0 | 3.8 | 3.7 | 5.3 | 3.9 | 4.6 | 49.5 |
1996–2025 normals for York County — the climate division South Berwick sits in. All-time county record high 100.2°F (1975-08-03); record low -23.0°F (1957-01-18). Source: NOAA / National Weather Service.