The official National Weather Service forecast for Marysville — 39.8411°N, 96.6472°W, 54.1 miles from I-70.
| Marshall County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 37 | 42 | 55 | 66 | 75 | 85 | 89 | 87 | 81 | 68 | 54 | 41 | 65 |
| Avg low °F | 16 | 20 | 30 | 40 | 51 | 62 | 66 | 64 | 55 | 43 | 30 | 20 | 41 |
| Precip in | 0.8 | 1.1 | 1.8 | 3.0 | 4.8 | 4.7 | 3.8 | 3.6 | 3.0 | 2.6 | 1.5 | 1.1 | 31.8 |
1996–2025 normals for Marshall County — the climate division Marysville sits in. All-time county record high 109.5°F (1980-07-15); record low -24.8°F (1989-12-23). Source: NOAA / National Weather Service.