The official National Weather Service forecast for Marion — 43.423°N, 97.2606°W, 17.5 miles from I-90.
| Turner County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 27 | 32 | 45 | 59 | 71 | 81 | 85 | 82 | 76 | 62 | 46 | 32 | 58 |
| Avg low °F | 9 | 12 | 24 | 35 | 47 | 58 | 63 | 60 | 52 | 38 | 25 | 14 | 36 |
| Precip in | 0.6 | 0.8 | 1.3 | 2.8 | 3.6 | 4.3 | 2.8 | 3.4 | 2.7 | 2.2 | 1.1 | 0.9 | 26.5 |
1996–2025 normals for Turner County — the climate division Marion sits in. All-time county record high 106.8°F (1988-06-22); record low -33.6°F (1970-01-19). Source: NOAA / National Weather Service.