The official National Weather Service forecast for Blythewood — 34.2143°N, 80.974°W, 2.4 miles from I-77. Forecasts here are written by NWS CAE, this county’s forecast office.
| Richland County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 57 | 61 | 68 | 77 | 83 | 89 | 92 | 90 | 85 | 76 | 66 | 59 | 75 |
| Avg low °F | 34 | 38 | 43 | 51 | 60 | 68 | 71 | 70 | 64 | 53 | 42 | 37 | 53 |
| Precip in | 3.6 | 3.3 | 3.7 | 3.2 | 3.5 | 4.5 | 4.9 | 4.7 | 4.1 | 2.9 | 2.7 | 3.8 | 44.9 |
1996–2025 normals for Richland County — the climate division Blythewood sits in. All-time county record high 107.0°F (1983-08-22); record low 1.5°F (1985-01-22). Source: NOAA / National Weather Service.