The official National Weather Service forecast for Nashville — 39.2073°N, 86.2511°W, 16.4 miles from I-65. Forecasts here are written by NWS IND, this county’s forecast office.
| Brown County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 37 | 42 | 53 | 65 | 74 | 82 | 85 | 84 | 79 | 67 | 53 | 42 | 64 |
| Avg low °F | 21 | 24 | 33 | 42 | 52 | 61 | 64 | 62 | 55 | 44 | 33 | 26 | 43 |
| Precip in | 3.6 | 3.0 | 4.2 | 5.0 | 5.2 | 5.2 | 4.5 | 3.2 | 3.4 | 3.5 | 3.4 | 3.6 | 47.8 |
1996–2025 normals for Brown County — the climate division Nashville sits in. All-time county record high 103.2°F (2012-07-08); record low -25.2°F (1994-01-19). Source: NOAA / National Weather Service.