The official National Weather Service forecast for Deer Park — 31.2168°N, 88.3172°W, 28.5 miles from I-65. Forecasts here are written by NWS MOB, this county’s forecast office.
| Washington County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 60 | 65 | 72 | 78 | 85 | 90 | 92 | 92 | 88 | 79 | 70 | 63 | 78 |
| Avg low °F | 37 | 41 | 47 | 53 | 61 | 69 | 71 | 71 | 66 | 54 | 44 | 40 | 54 |
| Precip in | 5.4 | 4.9 | 5.7 | 4.9 | 4.5 | 6.2 | 6.4 | 5.7 | 4.5 | 3.4 | 3.9 | 5.5 | 61.0 |
1996–2025 normals for Washington County — the climate division Deer Park sits in. All-time county record high 103.3°F (2023-08-27); record low 2.0°F (1985-01-21). Source: NOAA / National Weather Service.