The official National Weather Service forecast for Cambridge — 42.3751°N, 71.1056°W, 1.5 miles from I-93.
| Middlesex County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 36 | 39 | 47 | 59 | 70 | 78 | 84 | 82 | 75 | 63 | 51 | 41 | 60 |
| Avg low °F | 18 | 19 | 26 | 36 | 47 | 56 | 62 | 60 | 52 | 41 | 32 | 23 | 39 |
| Precip in | 3.6 | 3.3 | 4.2 | 4.3 | 4.0 | 4.2 | 3.9 | 3.7 | 3.9 | 4.8 | 3.5 | 4.5 | 47.9 |
1996–2025 normals for Middlesex County — the climate division Cambridge sits in. All-time county record high 101.2°F (2025-06-25); record low -18.5°F (1957-01-14). Source: NOAA / National Weather Service.