The official National Weather Service forecast for Rio Hondo — 26.2354°N, 97.5819°W, 8.7 miles from I-69. Forecasts here are written by NWS BRO, this county’s forecast office.
| Cameron County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 71 | 75 | 80 | 85 | 90 | 94 | 94 | 96 | 92 | 87 | 79 | 73 | 85 |
| Avg low °F | 51 | 55 | 61 | 66 | 73 | 76 | 77 | 77 | 74 | 67 | 60 | 53 | 66 |
| Precip in | 1.0 | 0.9 | 1.5 | 1.2 | 2.4 | 2.7 | 2.6 | 1.8 | 5.3 | 3.0 | 1.9 | 1.2 | 25.5 |
1996–2025 normals for Cameron County — the climate division Rio Hondo sits in. All-time county record high 104.1°F (2024-05-10); record low 16.4°F (1962-01-12). Source: NOAA / National Weather Service.