The official National Weather Service forecast for Seneca — 36.8415°N, 94.6111°W, 8.1 miles from I-44. Forecasts here are written by NWS SGF, this county’s forecast office.
| Newton County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 46 | 50 | 60 | 69 | 77 | 85 | 90 | 89 | 83 | 71 | 60 | 49 | 69 |
| Avg low °F | 25 | 28 | 37 | 46 | 55 | 64 | 69 | 67 | 59 | 47 | 37 | 29 | 47 |
| Precip in | 2.2 | 2.2 | 3.9 | 4.6 | 6.5 | 4.7 | 3.5 | 3.7 | 4.0 | 4.1 | 3.2 | 2.5 | 45.1 |
1996–2025 normals for Newton County — the climate division Seneca sits in. All-time county record high 112.1°F (1954-07-14); record low -14.1°F (1989-12-23). Source: NOAA / National Weather Service.