The official National Weather Service forecast for Port Saint Lucie — 27.2939°N, 80.3503°W, 4.8 miles from I-95. Forecasts here are written by NWS MLB, this county’s forecast office.
| St. Lucie County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 73 | 76 | 79 | 83 | 87 | 90 | 91 | 91 | 89 | 85 | 79 | 76 | 83 |
| Avg low °F | 52 | 56 | 59 | 63 | 68 | 72 | 74 | 74 | 73 | 69 | 62 | 57 | 65 |
| Precip in | 2.2 | 2.0 | 2.7 | 3.0 | 4.2 | 7.5 | 5.9 | 7.1 | 7.5 | 4.8 | 3.0 | 2.6 | 52.5 |
1996–2025 normals for St. Lucie County — the climate division Port Saint Lucie sits in. All-time county record high 98.5°F (2026-08-18); record low 24.2°F (1977-01-20). Source: NOAA / National Weather Service.