The official National Weather Service forecast for Tecumseh — 35.2578°N, 96.9367°W, 12.6 miles from I-40. Forecasts here are written by NWS OUN, this county’s forecast office.
| Pottawatomie County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 51 | 55 | 65 | 73 | 80 | 88 | 94 | 94 | 86 | 75 | 63 | 54 | 73 |
| Avg low °F | 28 | 31 | 41 | 48 | 58 | 67 | 71 | 70 | 62 | 50 | 40 | 31 | 50 |
| Precip in | 1.6 | 1.9 | 2.9 | 4.2 | 5.2 | 4.9 | 3.6 | 3.3 | 3.2 | 3.8 | 2.3 | 1.9 | 38.8 |
1996–2025 normals for Pottawatomie County — the climate division Tecumseh sits in. All-time county record high 111.5°F (2012-08-02); record low -9.7°F (2021-02-17). Source: NOAA / National Weather Service.