The official National Weather Service forecast for Port Gibson — 31.961°N, 90.984°W, 24.8 miles from I-20. Forecasts here are written by NWS JAN, this county’s forecast office.
| Claiborne County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 59 | 63 | 71 | 77 | 84 | 90 | 92 | 92 | 88 | 80 | 69 | 61 | 77 |
| Avg low °F | 37 | 41 | 47 | 54 | 62 | 69 | 72 | 71 | 65 | 54 | 45 | 40 | 55 |
| Precip in | 6.0 | 5.3 | 5.4 | 5.1 | 4.6 | 4.3 | 4.4 | 4.6 | 3.7 | 3.5 | 4.2 | 5.3 | 56.4 |
1996–2025 normals for Claiborne County — the climate division Port Gibson sits in. All-time county record high 105.8°F (2000-09-01); record low 1.6°F (1962-01-12). Source: NOAA / National Weather Service.