The official National Weather Service forecast for Lafayette — 45.2443°N, 123.1148°W, 14 miles from I-5. Forecasts here are written by NWS PQR, this county’s forecast office.
| Yamhill County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 46 | 49 | 53 | 58 | 66 | 72 | 80 | 81 | 74 | 62 | 51 | 45 | 61 |
| Avg low °F | 36 | 35 | 37 | 39 | 45 | 49 | 53 | 54 | 50 | 44 | 39 | 35 | 43 |
| Precip in | 9.4 | 7.0 | 6.8 | 4.4 | 2.8 | 1.6 | 0.3 | 0.6 | 2.0 | 5.2 | 9.2 | 11.2 | 60.5 |
1996–2025 normals for Yamhill County — the climate division Lafayette sits in. All-time county record high 105.5°F (2021-06-28); record low 2.6°F (1972-12-09). Source: NOAA / National Weather Service.