The official National Weather Service forecast for Blenheim — 34.5107°N, 79.6528°W, 13.4 miles from I-95. Forecasts here are written by NWS ILM, this county’s forecast office.
| Marlboro County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 55 | 60 | 67 | 76 | 83 | 89 | 92 | 90 | 85 | 76 | 66 | 58 | 75 |
| Avg low °F | 33 | 36 | 42 | 50 | 59 | 67 | 71 | 70 | 64 | 52 | 41 | 36 | 52 |
| Precip in | 3.4 | 3.2 | 3.5 | 3.3 | 3.8 | 4.3 | 5.1 | 4.9 | 5.1 | 3.0 | 3.0 | 3.6 | 46.2 |
1996–2025 normals for Marlboro County — the climate division Blenheim sits in. All-time county record high 105.7°F (2007-08-10); record low -1.7°F (1985-01-21). Source: NOAA / National Weather Service.