The official National Weather Service forecast for Havre de Grace — 39.5493°N, 76.0916°W, 29.9 miles from I-83. Forecasts here are written by NWS LWX, this county’s forecast office.
| Harford County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 41 | 45 | 53 | 65 | 74 | 83 | 87 | 85 | 79 | 67 | 56 | 46 | 65 |
| Avg low °F | 24 | 26 | 33 | 43 | 53 | 62 | 67 | 65 | 59 | 47 | 36 | 29 | 45 |
| Precip in | 3.2 | 2.7 | 3.8 | 3.7 | 4.0 | 4.6 | 4.7 | 4.3 | 4.8 | 3.8 | 3.0 | 4.0 | 46.6 |
1996–2025 normals for Harford County — the climate division Havre de Grace sits in. All-time county record high 103.5°F (2011-07-23); record low -7.5°F (1982-01-17). Source: NOAA / National Weather Service.