The official National Weather Service forecast for Arlington — 39.6425°N, 85.5764°W, 12.9 miles from I-70. Forecasts here are written by NWS IND, this county’s forecast office.
| Rush County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 36 | 41 | 52 | 64 | 74 | 82 | 84 | 83 | 78 | 66 | 52 | 41 | 63 |
| Avg low °F | 21 | 24 | 32 | 41 | 51 | 60 | 63 | 62 | 54 | 44 | 33 | 26 | 43 |
| Precip in | 3.3 | 2.7 | 3.8 | 4.7 | 5.1 | 5.1 | 4.4 | 3.4 | 3.2 | 3.2 | 3.2 | 3.4 | 45.5 |
1996–2025 normals for Rush County — the climate division Arlington sits in. All-time county record high 103.2°F (2012-07-07); record low -25.4°F (1994-01-19). Source: NOAA / National Weather Service.