The official National Weather Service forecast for Osawatomie — 38.4972°N, 94.9505°W, 15.9 miles from I-35.
| Miami County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 45 | 56 | 66 | 75 | 85 | 89 | 88 | 81 | 69 | 56 | 44 | 66 |
| Avg low °F | 21 | 25 | 35 | 44 | 55 | 65 | 69 | 67 | 58 | 46 | 35 | 25 | 45 |
| Precip in | 1.3 | 1.6 | 2.7 | 3.9 | 5.7 | 5.3 | 3.9 | 3.8 | 3.9 | 3.6 | 2.2 | 1.6 | 39.5 |
1996–2025 normals for Miami County — the climate division Osawatomie sits in. All-time county record high 111.4°F (1954-07-14); record low -20.4°F (1989-12-23). Source: NOAA / National Weather Service.