The official National Weather Service forecast for Cornelius — 35.4868°N, 80.8601°W, 10.8 miles from I-85. Forecasts here are written by NWS GSP, this county’s forecast office.
| Mecklenburg County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 52 | 57 | 64 | 73 | 80 | 87 | 90 | 88 | 83 | 73 | 63 | 55 | 72 |
| Avg low °F | 31 | 34 | 40 | 48 | 57 | 65 | 69 | 68 | 61 | 49 | 39 | 33 | 50 |
| Precip in | 3.6 | 3.1 | 3.6 | 3.7 | 3.8 | 3.9 | 4.1 | 4.2 | 4.1 | 2.8 | 3.0 | 3.8 | 43.7 |
1996–2025 normals for Mecklenburg County — the climate division Cornelius sits in. All-time county record high 104.8°F (1983-08-22); record low -3.9°F (1985-01-21). Source: NOAA / National Weather Service.