The official National Weather Service forecast for Mount Pleasant — 40.9636°N, 91.5579°W, population 9,284, 49.5 miles from I-80.
| Henry County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 37 | 50 | 62 | 73 | 82 | 85 | 83 | 78 | 65 | 50 | 37 | 61 |
| Avg low °F | 15 | 18 | 30 | 40 | 51 | 61 | 65 | 62 | 54 | 43 | 31 | 21 | 41 |
| Precip in | 1.5 | 1.7 | 2.5 | 3.7 | 5.0 | 5.1 | 3.9 | 3.7 | 3.3 | 3.1 | 1.8 | 1.8 | 37.1 |
1996–2025 normals for Henry County — the climate division Mount Pleasant sits in. All-time county record high 104.7°F (2012-07-24); record low -25.4°F (2019-01-31). Source: NOAA / National Weather Service.