The official National Weather Service forecast for Picayune — 30.5256°N, 89.6779°W, population 16,301, 4.5 miles from I-59. Forecasts here are written by NWS LIX, this county’s forecast office.
| Pearl River County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 61 | 65 | 72 | 78 | 85 | 90 | 92 | 92 | 88 | 80 | 70 | 64 | 78 |
| Avg low °F | 39 | 43 | 49 | 55 | 63 | 70 | 72 | 71 | 67 | 56 | 46 | 42 | 56 |
| Precip in | 5.4 | 4.9 | 5.3 | 5.3 | 5.1 | 6.6 | 6.6 | 6.5 | 4.9 | 3.7 | 3.9 | 5.7 | 63.9 |
1996–2025 normals for Pearl River County — the climate division Picayune sits in. All-time county record high 104.4°F (2023-08-27); record low 5.2°F (1985-01-21). Source: NOAA / National Weather Service.