The official National Weather Service forecast for Wamego — 39.2019°N, 96.305°W, population 4,899, 10.5 miles from I-70.
| Pottawatomie County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 38 | 43 | 55 | 66 | 75 | 85 | 89 | 88 | 81 | 68 | 55 | 42 | 65 |
| Avg low °F | 18 | 21 | 32 | 42 | 53 | 63 | 67 | 65 | 56 | 44 | 32 | 22 | 43 |
| Precip in | 0.8 | 1.1 | 1.9 | 3.4 | 4.9 | 4.8 | 3.8 | 3.9 | 2.9 | 2.6 | 1.6 | 1.1 | 32.8 |
1996–2025 normals for Pottawatomie County — the climate division Wamego sits in. All-time county record high 110.7°F (1980-06-28); record low -23.7°F (1989-12-23). Source: NOAA / National Weather Service.