Port Isabel, TX Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Port Isabel, a city in Cameron County, Texas.

Today

93°F

Sunny

Sunny, with a high near 93. Heat index values as high as 106. South southeast wind 8 to 18 mph.

7-day forecast for Port Isabel

When	Temp	Forecast	Wind	Precip
Today	93°F	Sunny	8 to 18 mph SSE	3%
Tonight	81°F	Mostly Clear	9 to 16 mph SE	1%
Wednesday	93°F	Mostly Sunny	9 to 16 mph SE	2%
Wednesday Night	80°F	Mostly Clear	7 to 14 mph SE	3%
Thursday	93°F	Sunny	7 to 15 mph SE	6%
Thursday Night	80°F	Mostly Clear	5 to 15 mph SE	6%
Friday	92°F	Sunny	5 to 14 mph SE	13%
Friday Night	79°F	Mostly Clear	3 to 12 mph SE	13%
Saturday	88°F	Sunny	2 to 13 mph SE	10%
Saturday Night	80°F	Mostly Clear	3 to 12 mph SE	10%
Sunday	88°F	Sunny	2 to 13 mph SE	13%
Sunday Night	80°F	Mostly Clear	8 to 13 mph SSE	10%
Monday	90°F	Sunny	7 to 17 mph SSE	6%
Monday Night	81°F	Mostly Clear	12 to 17 mph SSE	6%

Forecast source: National Weather Service (api.weather.gov) for Port Isabel (26.063, -97.247). Updated through the day.

Growing snapshot for Port Isabel

Last spring frost

Jan 3

First fall frost

Jan 1

Growing season

365 days

Hardiness zone

10a

More local growing data for Port Isabel: nearby ZIP 78578 weather · frost dates · planting calendar · Texas frost dates

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Climate data from the nearest NOAA station, Port Isabel, Tx (3.5 mi from Port Isabel). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.