The official National Weather Service forecast for Isleton — 38.1619°N, 121.6116°W, 11 miles from I-5. Forecasts here are written by NWS STO, this county’s forecast office.
| Sacramento County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 57 | 62 | 67 | 73 | 81 | 90 | 95 | 94 | 89 | 79 | 65 | 57 | 76 |
| Avg low °F | 39 | 41 | 44 | 47 | 53 | 58 | 61 | 60 | 58 | 51 | 44 | 39 | 50 |
| Precip in | 3.6 | 3.5 | 2.6 | 1.6 | 0.8 | 0.1 | 0.0 | 0.0 | 0.1 | 1.0 | 2.0 | 3.6 | 18.9 |
1996–2025 normals for Sacramento County — the climate division Isleton sits in. All-time county record high 113.0°F (2022-09-07); record low 18.3°F (1990-12-22). Source: NOAA / National Weather Service.