Marine Weather Net

Port Aransas to Matagorda Ship Channel Marine Forecast


TODAY

S
WINDS
10 - 15
KNOTS

TONIGHT

S
WINDS
10 - 15
KNOTS

THURSDAY

S
WINDS
10 - 15
KNOTS

THURSDAY NIGHT

S
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
GMZ255 Forecast Issued: 206 AM CDT Wed Aug 19 2026

Today...South Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: South 3 Feet At 4 Seconds And Southeast 1 Foot At 8 Seconds.
Tonight...South Winds 10 To 15 Knots With Gusts Up To 20 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 3 Feet At 4 Seconds And Southeast 1 Foot At 7 Seconds.
Thursday...South Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: South 3 Feet At 5 Seconds.
Thursday Night...South Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: South 3 Feet At 5 Seconds And Southeast 1 Foot At 8 Seconds.
Friday...South Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: South 3 Feet At 5 Seconds.
Friday Night...South Winds 10 To 15 Knots. Seas Around 2 Feet. Wave Detail: South 2 Feet At 5 Seconds.
Saturday...South Winds 5 To 10 Knots. Seas Around 2 Feet.
Saturday Night...South Winds Around 10 Knots. Seas Around 2 Feet.
Sunday...South Winds 5 To 10 Knots. Seas Around 2 Feet.
Sunday Night...South Winds Around 10 Knots. Seas Around 2 Feet.
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Area Forecast Discussion
National Weather Service Corpus Christi TX
633am CDT Wednesday August 19 2026

Issued at 116am CDT Wednesday August 19 2026

The forecast pattern continues to be fairly stagnant, with small shifts in the center position of the mid-level high. Hot and generally dry conditions will persist through the forecast, though there is a very low chance for some seabreeze convection.

We have noticed that the forecast high temperatures have been a bit lower than we have been reaching so, with no significant change to the pattern, have blended the observed max temperatures with the most recent NBM (75/25) over land. Temperatures are expected to range from 90 along the coast to around 105 inland, keeping us in a moderate to high HeatRisk. Heat index values over the Coastal Bend will reach 110-113, so have issued a Heat Advisory for this afternoon. More telling, the WetBulb Glob Temperatures (based on Texas UIL guidelines) are expected to be Moderate today, so it is important to take at least 4 separate 5 minute breaks out of the sun/heat. Drink plenty of water and/or electrolytes, dress in light, loose clothing, and make sure you monitor yourself and others for heat exhaustion.

Marine
Issued at 116am CDT Wednesday August 19 2026

Generally gentle to moderate (BF 3-4) onshore breezes will continue through the period, with occasional fresh (BF 5) breezes possible during the late afternoon/evening hours. Seas are expected to remain around 2-3 feet. Rain chances will remain near zero.

NOAA Corpus Christi TX Office: Watches - Warnings - Advisories
TX...
Heat Advisory from 1pm this afternoon to 7pm CDT this evening for TXZ241>247-342>344-346.

GM...None.