The official National Weather Service forecast for Tybee Island — 32.0002°N, 80.8457°W, population 3,316, 16 miles from I-16. Forecasts here are written by NWS CHS, this county’s forecast office.
| Chatham County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 62 | 66 | 71 | 78 | 85 | 90 | 92 | 90 | 86 | 79 | 71 | 64 | 78 |
| Avg low °F | 40 | 43 | 48 | 55 | 63 | 70 | 73 | 73 | 69 | 59 | 48 | 43 | 57 |
| Precip in | 3.0 | 3.3 | 3.4 | 3.1 | 3.5 | 5.6 | 5.6 | 6.1 | 4.7 | 3.0 | 2.1 | 3.1 | 46.5 |
1996–2025 normals for Chatham County — the climate division Tybee Island sits in. All-time county record high 103.7°F (1986-07-20); record low 4.4°F (1985-01-21). Source: NOAA / National Weather Service.