The official National Weather Service forecast for Tecumseh — 42.0039°N, 83.9449°W, population 13,684, 19 miles from I-94. Forecasts here are written by NWS DTX, this county’s forecast office.
| Lenawee County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 35 | 47 | 59 | 71 | 80 | 84 | 81 | 76 | 63 | 49 | 37 | 60 |
| Avg low °F | 18 | 19 | 27 | 37 | 48 | 58 | 61 | 60 | 52 | 42 | 32 | 24 | 40 |
| Precip in | 2.2 | 2.1 | 2.5 | 3.2 | 3.9 | 3.7 | 3.3 | 3.2 | 3.0 | 2.7 | 2.4 | 2.3 | 34.5 |
1996–2025 normals for Lenawee County — the climate division Tecumseh sits in. All-time county record high 101.9°F (2012-06-29); record low -19.9°F (1994-01-19). Source: NOAA / National Weather Service.