The official National Weather Service forecast for Hillsborough — 36.0754°N, 79.0997°W, population 15,800, 2.9 miles from I-40. Forecasts here are written by NWS RAH, this county’s forecast office.
| Orange County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 51 | 55 | 62 | 72 | 78 | 86 | 89 | 87 | 81 | 72 | 62 | 54 | 71 |
| Avg low °F | 29 | 32 | 38 | 46 | 55 | 64 | 68 | 66 | 60 | 48 | 37 | 32 | 48 |
| Precip in | 3.6 | 3.1 | 4.0 | 3.9 | 4.1 | 4.2 | 4.8 | 4.5 | 5.2 | 3.2 | 3.1 | 3.7 | 47.4 |
1996–2025 normals for Orange County — the climate division Hillsborough sits in. All-time county record high 102.8°F (1988-08-19); record low -7.0°F (1985-01-21). Source: NOAA / National Weather Service.