The official National Weather Service forecast for Marco Island — 25.9412°N, 81.7184°W, 15.4 miles from I-75. Forecasts here are written by NWS MFL, this county’s forecast office.
| Collier County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 76 | 80 | 82 | 86 | 90 | 92 | 93 | 93 | 91 | 88 | 82 | 79 | 86 |
| Avg low °F | 54 | 57 | 59 | 62 | 67 | 72 | 74 | 75 | 74 | 70 | 62 | 58 | 65 |
| Precip in | 1.6 | 1.7 | 1.9 | 2.5 | 4.3 | 9.4 | 7.9 | 8.6 | 8.3 | 3.8 | 1.8 | 1.8 | 53.6 |
1996–2025 normals for Collier County — the climate division Marco Island sits in. All-time county record high 99.5°F (1998-07-04); record low 27.3°F (1982-01-12). Source: NOAA / National Weather Service.