The official National Weather Service forecast for Siler City — 35.7235°N, 79.4622°W, population 8,616, 21 miles from I-74. Forecasts here are written by NWS RAH, this county’s forecast office.
| Chatham County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 52 | 56 | 64 | 73 | 79 | 87 | 90 | 88 | 82 | 73 | 63 | 55 | 72 |
| Avg low °F | 30 | 33 | 39 | 47 | 56 | 65 | 69 | 68 | 61 | 49 | 38 | 33 | 49 |
| Precip in | 3.5 | 3.1 | 3.8 | 3.7 | 3.8 | 3.9 | 5.0 | 4.6 | 5.2 | 2.9 | 3.1 | 3.7 | 46.3 |
1996–2025 normals for Chatham County — the climate division Siler City sits in. All-time county record high 103.7°F (1988-08-19); record low -6.6°F (1985-01-21). Source: NOAA / National Weather Service.