The official National Weather Service forecast for Harlowton — 46.4355°N, 109.8344°W, 41.7 miles from I-90.
| Wheatland County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 36 | 36 | 45 | 53 | 62 | 71 | 82 | 81 | 71 | 56 | 44 | 36 | 56 |
| Avg low °F | 15 | 14 | 21 | 28 | 36 | 44 | 50 | 48 | 41 | 31 | 22 | 15 | 30 |
| Precip in | 0.6 | 0.7 | 0.8 | 1.7 | 2.8 | 2.9 | 1.4 | 1.4 | 1.3 | 1.1 | 0.7 | 0.7 | 16.1 |
1996–2025 normals for Wheatland County — the climate division Harlowton sits in. All-time county record high 103.9°F (2026-07-13); record low -36.2°F (2024-01-13). Source: NOAA / National Weather Service.