The official National Weather Service forecast for Hillsboro — 39.2023°N, 83.6116°W, population 6,613, 25.1 miles from I-71.
| Highland County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 39 | 43 | 53 | 65 | 74 | 82 | 85 | 84 | 79 | 67 | 54 | 43 | 64 |
| Avg low °F | 22 | 24 | 32 | 41 | 51 | 59 | 63 | 61 | 54 | 43 | 33 | 27 | 42 |
| Precip in | 3.3 | 3.2 | 4.0 | 4.5 | 4.9 | 4.8 | 4.5 | 3.3 | 3.3 | 3.3 | 3.1 | 3.6 | 45.8 |
1996–2025 normals for Highland County — the climate division Hillsboro sits in. All-time county record high 101.5°F (2012-07-08); record low -25.5°F (1994-01-19). Source: NOAA / National Weather Service.