The official National Weather Service forecast for Union — 32.9882°N, 87.915°W, 9.6 miles from I-59. Forecasts here are written by NWS BMX, this county’s forecast office.
| Greene County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 56 | 61 | 69 | 76 | 84 | 90 | 92 | 91 | 87 | 78 | 67 | 59 | 76 |
| Avg low °F | 34 | 38 | 45 | 51 | 60 | 68 | 71 | 70 | 65 | 53 | 42 | 37 | 53 |
| Precip in | 5.4 | 5.4 | 5.5 | 5.2 | 4.1 | 4.9 | 4.9 | 4.2 | 3.5 | 3.0 | 3.8 | 5.1 | 55.0 |
1996–2025 normals for Greene County — the climate division Union sits in. All-time county record high 104.7°F (1952-07-25); record low -0.3°F (1985-01-21). Source: NOAA / National Weather Service.