The official National Weather Service forecast for Sioux City — 42.5°N, 96.4003°W, population 113,066, 1.6 miles from I-29.
| Woodbury County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 29 | 34 | 48 | 61 | 72 | 82 | 85 | 83 | 77 | 63 | 48 | 33 | 60 |
| Avg low °F | 11 | 14 | 26 | 37 | 48 | 60 | 63 | 61 | 52 | 40 | 27 | 16 | 38 |
| Precip in | 0.7 | 0.8 | 1.7 | 3.0 | 4.3 | 4.4 | 3.4 | 3.9 | 2.7 | 2.3 | 1.2 | 1.1 | 29.5 |
1996–2025 normals for Woodbury County — the climate division Sioux City sits in. All-time county record high 104.0°F (1988-06-22); record low -28.3°F (2021-02-16). Source: NOAA / National Weather Service.