The official National Weather Service forecast for Collegedale — 35.0531°N, 85.0502°W, 2.6 miles from I-75.
| Hamilton County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 49 | 54 | 63 | 72 | 79 | 86 | 88 | 88 | 83 | 73 | 61 | 52 | 71 |
| Avg low °F | 30 | 34 | 40 | 47 | 57 | 64 | 68 | 67 | 61 | 49 | 39 | 33 | 49 |
| Precip in | 5.1 | 5.3 | 5.4 | 5.0 | 4.6 | 4.4 | 4.5 | 4.2 | 4.4 | 3.5 | 4.3 | 5.5 | 56.2 |
1996–2025 normals for Hamilton County — the climate division Collegedale sits in. All-time county record high 104.0°F (1980-07-17); record low -12.2°F (1985-01-21). Source: NOAA / National Weather Service.