The official National Weather Service forecast for Mentone — 41.1734°N, 86.0347°W, 38.6 miles from I-90. Forecasts here are written by NWS IWX, this county’s forecast office.
| Kosciusko County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 36 | 48 | 61 | 72 | 81 | 84 | 82 | 77 | 64 | 49 | 37 | 60 |
| Avg low °F | 17 | 20 | 28 | 38 | 49 | 59 | 62 | 60 | 53 | 42 | 32 | 23 | 40 |
| Precip in | 2.5 | 2.3 | 2.7 | 3.6 | 4.4 | 4.3 | 4.2 | 3.9 | 2.9 | 3.0 | 2.5 | 2.5 | 38.8 |
1996–2025 normals for Kosciusko County — the climate division Mentone sits in. All-time county record high 102.5°F (1980-07-16); record low -21.8°F (1985-01-21). Source: NOAA / National Weather Service.