Marine Weather and Tide Forecast for Port Isabel, TX
 | Sunrise 6:58 AM Sunset 8:13 PM Moonrise 11:32 PM Moonset 12:30 PM |
Marine Forecasts
NOTE: Zones updated 4/16/2026. Some zones changed. Use Edit if needed.
GMZ130 Laguna Madre From The Port Of Brownsville To The Arroyo Colorado- Laguna Madre From The Arroyo Colorado To 5 Nm North Of Port Mansfield Tx- Laguna Madre From 5 Nm North Of Port Mansfield To Baffin Bay Tx- 156 Am Cdt Wed Aug 5 2026
Today - Southeast winds 10 to 15 knots. A moderate chop on the bay.
Tonight - Southeast winds 10 to 15 knots. A moderate chop on the bay.
Thursday - Southeast winds 10 to 15 knots. A moderate chop on the bay.
Thursday night - Southeast winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. A moderate chop on the bay, diminishing to a light chop on the bay after midnight.
Friday - Southeast winds 5 to 10 knots, increasing to 10 to 15 knots late in the afternoon. A light chop on the bay, increasing to a moderate chop on the bay late in the afternoon.
Friday night - Southeast winds 10 to 15 knots, diminishing to 5 to 10 knots in the late evening and early morning, then diminishing to around 5 knots early in the morning. A moderate chop on the bay, diminishing to a light chop on the bay in the late evening and early morning.
Saturday - Southeast winds around 5 knots, becoming east in the afternoon. A light chop on the bay.
Saturday night - Southeast winds 5 to 10 knots, becoming south early in the morning. A light chop on the bay.
Sunday - South winds around 5 knots, becoming southeast in the afternoon, then becoming east 10 to 15 knots late in the afternoon. A light chop on the bay, increasing to a moderate chop on the bay in the afternoon.
Sunday night - Southeast winds 10 to 15 knots, becoming south 5 to 10 knots early in the morning. A moderate chop on the bay, diminishing to a light chop on the bay early in the morning.
GMZ100 156 Am Cdt Wed Aug 5 2026
Synopsis - Light to moderate winds and low to moderate seas will prevail along the lower texas coast with a modest pressure gradient in place.
7 Day Forecast for Marine Location Near Port Isabel, TX
NEW! Add second zone forecast
| Port Isabel Click for Map Wed -- 05:55 AM CDT 1.08 feet High Tide Wed -- 06:56 AM CDT Sunrise Wed -- 01:30 PM CDT Moonset Wed -- 03:23 PM CDT -0.06 feet Low Tide Wed -- 08:12 PM CDT Sunset Wed -- 09:22 PM CDT Last Quarter Tide / Current data from XTide NOT FOR NAVIGATION |
Port Isabel, Laguna Madre, Texas, Tide feet
| 12 am |
| 1 |
| 1 am |
| 1 |
| 2 am |
| 1 |
| 3 am |
| 1.1 |
| 4 am |
| 1.1 |
| 5 am |
| 1.1 |
| 6 am |
| 1.1 |
| 7 am |
| 1.1 |
| 8 am |
| 1 |
| 9 am |
| 0.9 |
| 10 am |
| 0.8 |
| 11 am |
| 0.6 |
| 12 pm |
| 0.4 |
| 1 pm |
| 0.2 |
| 2 pm |
| 0 |
| 3 pm |
| -0.1 |
| 4 pm |
| -0 |
| 5 pm |
| 0.1 |
| 6 pm |
| 0.2 |
| 7 pm |
| 0.4 |
| 8 pm |
| 0.7 |
| 9 pm |
| 0.9 |
| 10 pm |
| 1 |
| 11 pm |
| 1.1 |
| Laguna Madre Channel Click for Map Flood direction 266 true Ebb direction 86 true Wed -- 02:16 AM CDT 0.16 knots Min Flood Wed -- 02:46 AM CDT 0.16 knots Max Flood Wed -- 05:06 AM CDT 0.12 knots Min Flood Wed -- 06:39 AM CDT 0.14 knots Max Flood Wed -- 06:56 AM CDT Sunrise Wed -- 08:27 AM CDT -0.00 knots Slack Wed -- 01:30 PM CDT Moonset Wed -- 01:40 PM CDT -0.50 knots Max Ebb Wed -- 05:59 PM CDT 0.00 knots Slack Wed -- 08:12 PM CDT Sunset Wed -- 09:22 PM CDT Last Quarter Wed -- 11:29 PM CDT 0.48 knots Max Flood Tide / Current data from XTide NOT FOR NAVIGATION |
Laguna Madre Channel, SW end (depth 3 ft), Texas Current, knots
| 12 am |
| 0.2 |
| 1 am |
| 0.2 |
| 2 am |
| 0.2 |
| 3 am |
| 0.2 |
| 4 am |
| 0.1 |
| 5 am |
| 0.1 |
| 6 am |
| 0.1 |
| 7 am |
| 0.1 |
| 8 am |
| 0.1 |
| 9 am |
| -0.1 |
| 10 am |
| -0.2 |
| 11 am |
| -0.2 |
| 12 pm |
| -0.4 |
| 1 pm |
| -0.5 |
| 2 pm |
| -0.5 |
| 3 pm |
| -0.4 |
| 4 pm |
| -0.3 |
| 5 pm |
| -0.2 |
| 6 pm |
| 0 |
| 7 pm |
| 0.2 |
| 8 pm |
| 0.3 |
| 9 pm |
| 0.3 |
| 10 pm |
| 0.4 |
| 11 pm |
| 0.5 |
FXUS64 KBRO 051714 AFDBRO
Area Forecast Discussion National Weather Service Brownsville TX 1214 PM CDT Wed Aug 5 2026
New DISCUSSION, AVIATION, MARINE
KEY MESSAGES
Updated at 1211 PM CDT Wed Aug 5 2026
- Unseasonably hot and humid conditions are expected to continue through this next week.
- Heat indices between 105-110 F are expected each afternoon with some areas exceeding 111 briefly. There will be Moderate to Major Heat Risk, with the potential for Heat Advisories.
- There is a low (less than 25%) chance of sea breeze showers and thunderstorms Friday through Sunday.
- There is a moderate risk of life-threatening rip currents at area beaches through tomorrow.
DISCUSSION
Issued at 1211 PM CDT Wed Aug 5 2026
Hot, humid, and mostly rain-free conditions are expected to continue throughout the next week as upper-level high pressure remains dominant over the Desert Southwest. Due to slightly increased moisture along the coast, there is a low (less than 25%) chance of sea breeze showers and thunderstorms each afternoon Friday through Sunday mainly for areas east of I-69E.
Otherwise, temperatures are expected to be unseasonably hot with heat indices reaching 105-110 degrees each day, with some areas potentially exceeding 111 degrees. There is a Moderate (level 2 of 4) to Major (level 3 of 4) Heat Risk, and the potential for Heat Advisories throughout the next week.
A moderate risk of life-threatening rip currents continues at area beaches through at least tomorrow.
AVIATION
(18Z TAFS)
Issued at 1211 PM CDT Wed Aug 5 2026
VFR conditions expected at all airports through the entire TAF period with southeasterly winds that are light to moderate and could be gusty at times through 00z.
MARINE
Issued at 1211 PM CDT Wed Aug 5 2026
Overall favorable conditions are expected throughout the week with light to moderate southeasterly winds and low seas. There is the potential for Small Craft Exercise Caution conditions in the Bay early next week if conditions get breezy.
PRELIMINARY POINT TEMPS/POPS
BROWNSVILLE 81 97 80 96 / 0 10 0 30 HARLINGEN 78 100 77 98 / 0 10 0 20 MCALLEN 81 103 80 102 / 0 10 0 20 RIO GRANDE CITY 79 103 78 102 / 0 0 0 10 SOUTH PADRE ISLAND 81 89 81 88 / 0 0 0 10 BAYVIEW/PORT ISABEL 80 96 79 94 / 0 10 0 20
BRO WATCHES/WARNINGS/ADVISORIES
TX...None.
GM...None.
Area Forecast Discussion National Weather Service Brownsville TX 1214 PM CDT Wed Aug 5 2026
New DISCUSSION, AVIATION, MARINE
KEY MESSAGES
Updated at 1211 PM CDT Wed Aug 5 2026
- Unseasonably hot and humid conditions are expected to continue through this next week.
- Heat indices between 105-110 F are expected each afternoon with some areas exceeding 111 briefly. There will be Moderate to Major Heat Risk, with the potential for Heat Advisories.
- There is a low (less than 25%) chance of sea breeze showers and thunderstorms Friday through Sunday.
- There is a moderate risk of life-threatening rip currents at area beaches through tomorrow.
DISCUSSION
Issued at 1211 PM CDT Wed Aug 5 2026
Hot, humid, and mostly rain-free conditions are expected to continue throughout the next week as upper-level high pressure remains dominant over the Desert Southwest. Due to slightly increased moisture along the coast, there is a low (less than 25%) chance of sea breeze showers and thunderstorms each afternoon Friday through Sunday mainly for areas east of I-69E.
Otherwise, temperatures are expected to be unseasonably hot with heat indices reaching 105-110 degrees each day, with some areas potentially exceeding 111 degrees. There is a Moderate (level 2 of 4) to Major (level 3 of 4) Heat Risk, and the potential for Heat Advisories throughout the next week.
A moderate risk of life-threatening rip currents continues at area beaches through at least tomorrow.
AVIATION
(18Z TAFS)
Issued at 1211 PM CDT Wed Aug 5 2026
VFR conditions expected at all airports through the entire TAF period with southeasterly winds that are light to moderate and could be gusty at times through 00z.
MARINE
Issued at 1211 PM CDT Wed Aug 5 2026
Overall favorable conditions are expected throughout the week with light to moderate southeasterly winds and low seas. There is the potential for Small Craft Exercise Caution conditions in the Bay early next week if conditions get breezy.
PRELIMINARY POINT TEMPS/POPS
BROWNSVILLE 81 97 80 96 / 0 10 0 30 HARLINGEN 78 100 77 98 / 0 10 0 20 MCALLEN 81 103 80 102 / 0 10 0 20 RIO GRANDE CITY 79 103 78 102 / 0 0 0 10 SOUTH PADRE ISLAND 81 89 81 88 / 0 0 0 10 BAYVIEW/PORT ISABEL 80 96 79 94 / 0 10 0 20
BRO WATCHES/WARNINGS/ADVISORIES
TX...None.
GM...None.
Wind History for Port Isabel, TX
toggle option: (graph/table)
Link to 5 hour of 5 minute data for KSPL
Terminal Aerodrome Forecast (TAF) for KSPL
Wind History Graph: SPL
(wind in knots)
GEOS Local Image of gulf of mexico
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Brownsville, TX,
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