The official National Weather Service forecast for Hays — 38.8792°N, 99.3268°W, population 21,880, 3 miles from I-70.
| Ellis County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 43 | 47 | 58 | 68 | 77 | 88 | 93 | 91 | 84 | 70 | 57 | 45 | 68 |
| Avg low °F | 18 | 20 | 30 | 39 | 50 | 61 | 66 | 64 | 56 | 42 | 30 | 21 | 41 |
| Precip in | 0.5 | 0.7 | 1.4 | 2.0 | 3.8 | 3.3 | 3.4 | 3.4 | 2.1 | 1.7 | 0.9 | 0.7 | 23.9 |
1996–2025 normals for Ellis County — the climate division Hays sits in. All-time county record high 113.4°F (2012-06-28); record low -23.9°F (1989-12-23). Source: NOAA / National Weather Service.