The official National Weather Service forecast for Piedmont — 37.8244°N, 122.2316°W, 3.4 miles from I-80. Forecasts here are written by NWS MTR, this county’s forecast office.
| Alameda County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 57 | 60 | 63 | 67 | 73 | 80 | 84 | 84 | 82 | 74 | 63 | 57 | 70 |
| Avg low °F | 41 | 42 | 44 | 46 | 50 | 55 | 58 | 58 | 57 | 52 | 45 | 41 | 49 |
| Precip in | 3.5 | 3.4 | 2.6 | 1.4 | 0.6 | 0.1 | 0.0 | 0.0 | 0.1 | 1.0 | 2.0 | 4.0 | 18.7 |
1996–2025 normals for Alameda County — the climate division Piedmont sits in. All-time county record high 107.6°F (2022-09-07); record low 17.4°F (1990-12-22). Source: NOAA / National Weather Service.