The official National Weather Service forecast for Gwinner — 46.2258°N, 97.6626°W, 44.1 miles from I-29.
| Sargent County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 20 | 24 | 38 | 54 | 68 | 78 | 83 | 80 | 73 | 57 | 40 | 26 | 53 |
| Avg low °F | 2 | 5 | 18 | 31 | 44 | 55 | 60 | 57 | 48 | 35 | 21 | 9 | 32 |
| Precip in | 0.5 | 0.6 | 0.9 | 2.0 | 3.1 | 3.8 | 3.3 | 2.9 | 2.5 | 2.2 | 0.7 | 0.8 | 23.3 |
1996–2025 normals for Sargent County — the climate division Gwinner sits in. All-time county record high 105.0°F (1988-07-06); record low -38.5°F (1994-02-09). Source: NOAA / National Weather Service.