Port Isabel, TX
Climate overview — based on NOAA 1991-2020 normals from PORT ISABEL, TX US.
Year-round temperatures (°F)
Climate summary
Port Isabel has an annual average temperature of 73.9°F with about 28.8 inches of precipitation per year and 0.2 inches of snow. The warmest month is August (average high 92.1°F), and the coldest is January (average low 51.7°F). September is typically the wettest month (6.15 in) and February the driest (1.22 in). Snow typically falls from December through December.
Best time to visit Port Isabel
Full guide →Climate change signal
All-time records →53 of 366 (14.5%) of Port Isabel's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1890s | 0 | |
| 1900s | 0 | |
| 1920s | 9 | |
| 1930s | 33 | |
| 1940s | 26 | |
| 1950s | 31 | |
| 1960s | 20 | |
| 1970s | 9 | |
| 1980s | 22 | |
| 1990s | 22 | |
| 2000s | 108 | |
| 2010s | 33 | |
| 2020s | 53 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 68.9°F | 51.7°F | 60.3°F | 1.45 in | — | 8 |
| February | 72.2°F | 56.3°F | 64.2°F | 1.22 in | — | 5 |
| March | 75.7°F | 61.2°F | 68.4°F | 1.68 in | — | 5 |
| April | 80.8°F | 67.0°F | 73.9°F | 1.59 in | — | 4 |
| May | 86.1°F | 72.7°F | 79.4°F | 2.36 in | — | 4 |
| June | 90.1°F | 76.3°F | 83.2°F | 3.06 in | — | 4 |
| July | 91.0°F | 77.0°F | 84.0°F | 2.27 in | — | 4 |
| August | 92.1°F | 77.0°F | 84.5°F | 1.93 in | — | 4 |
| September | 88.5°F | 73.9°F | 81.2°F | 6.15 in | — | 8 |
| October | 85.1°F | 69.0°F | 77.0°F | 3.86 in | — | 7 |
| November | 77.5°F | 60.7°F | 69.1°F | 1.77 in | — | 6 |
| December | 70.5°F | 53.6°F | 62.1°F | 1.41 in | 0.2 in | 8 |
Climate twins of Port Isabel
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).