The official National Weather Service forecast for Fountain Inn — 34.689°N, 82.1957°W, 0.8 miles from I-385. Forecasts here are written by NWS GSP, this county’s forecast office.
| Greenville County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 52 | 57 | 64 | 72 | 79 | 85 | 88 | 87 | 81 | 72 | 63 | 54 | 71 |
| Avg low °F | 32 | 35 | 41 | 48 | 57 | 65 | 69 | 68 | 62 | 51 | 40 | 35 | 50 |
| Precip in | 4.7 | 4.1 | 4.7 | 4.5 | 4.5 | 4.4 | 4.6 | 4.6 | 4.6 | 3.7 | 3.8 | 5.0 | 53.2 |
1996–2025 normals for Greenville County — the climate division Fountain Inn sits in. All-time county record high 102.2°F (2012-07-02); record low -4.5°F (1985-01-22). Source: NOAA / National Weather Service.