The official National Weather Service forecast for San Luis Obispo — 35.2828°N, 120.6596°W, population 56,904, 60.5 miles from I-5. Forecasts here are written by NWS LOX, this county’s forecast office.
| San Luis Obispo County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 61 | 62 | 65 | 70 | 76 | 84 | 89 | 89 | 85 | 77 | 67 | 61 | 74 |
| Avg low °F | 38 | 39 | 40 | 43 | 47 | 52 | 57 | 57 | 54 | 48 | 42 | 38 | 46 |
| Precip in | 3.6 | 3.4 | 2.5 | 1.1 | 0.4 | 0.0 | 0.0 | 0.0 | 0.1 | 0.7 | 1.5 | 3.2 | 16.5 |
1996–2025 normals for San Luis Obispo County — the climate division San Luis Obispo sits in. All-time county record high 108.9°F (2020-09-07); record low 12.6°F (1990-12-23). Source: NOAA / National Weather Service.