The official National Weather Service forecast for Sedan — 37.1267°N, 96.1869°W, 70.6 miles from I-135.
| Chautauqua County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 45 | 50 | 60 | 70 | 78 | 86 | 92 | 91 | 84 | 72 | 60 | 48 | 70 |
| Avg low °F | 23 | 26 | 36 | 46 | 56 | 65 | 70 | 68 | 60 | 48 | 36 | 27 | 47 |
| Precip in | 1.3 | 1.6 | 3.0 | 4.0 | 5.9 | 5.6 | 3.7 | 3.8 | 3.2 | 3.7 | 2.0 | 1.6 | 39.4 |
1996–2025 normals for Chautauqua County — the climate division Sedan sits in. All-time county record high 113.4°F (1954-07-14); record low -15.8°F (2011-02-10). Source: NOAA / National Weather Service.