The official National Weather Service forecast for Au Sable — 44.4109°N, 83.3322°W, 44.4 miles from I-75. Forecasts here are written by NWS APX, this county’s forecast office.
| Iosco County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 29 | 32 | 41 | 54 | 66 | 76 | 81 | 79 | 72 | 59 | 46 | 34 | 56 |
| Avg low °F | 14 | 14 | 22 | 32 | 42 | 53 | 58 | 56 | 49 | 39 | 30 | 21 | 36 |
| Precip in | 1.7 | 1.7 | 2.0 | 3.1 | 3.2 | 3.3 | 3.4 | 3.1 | 2.7 | 2.9 | 2.0 | 2.1 | 31.2 |
1996–2025 normals for Iosco County — the climate division Au Sable sits in. All-time county record high 98.9°F (2026-07-15); record low -28.5°F (1979-02-17). Source: NOAA / National Weather Service.