Marine Weather and Tide Forecast for San Leon, TX

DISCUSSION
Issued at 1046 PM CDT Thu Aug 13 2026

Partly cloudy skies expected overnight along with low temperatures in the mid 70s to lower 80s areawide. Winds will continue to relax to around 5 mph or less by late tonight.

A surge of moisture from the western Gulf waters along with a few vort maxes will make its way into Southeast Texas on Friday. PWs are expected to rise to 1.9-2.2 starting in the morning for the areas south of I-10 and expanding northward to the rest of the CWA during the late morning to early afternoon hours. Although these PWs should generally be able to bring some decent rainfall, the broad mid-upper level high pressure over SE CONUS will remain fairly strong with the western edge of it expanding even further west into western TX during the day Friday. I have continued to carry PoPs of 20-30%, in particular during the afternoon where instability and diurnal heating is at its highest and may be assisted by the seabreeze boundary. If any strong storms do develop, brief periods of heavy rainfall is possible. The highs will be a degree or two less than yesterday, but still range in the mid to upper 90s for much of the inland areas while the coasts remain in the lower 90s.

Dry conditions will resume this weekend and continue into the upcoming work week. The highs will be in the upper 90s inland and the lower to mid 90s along the coast, with some locations possibly hitting the 100 deg F mark next week. Heat indices will peak between 105-110 deg F for many locations. Do not underestimate the effects of heat stress when working or spending time outdoors for extended periods. Make sure to keep protecting yourself, your loved ones, and pets safe from the heat :). As stated in the previous forecast discussion, reduce or change the time spent outdoors to cooler times of day, increase the time and access to air-conditioned spaces, and always check the car seats before departing your vehicle.

Cotto

AVIATION
(18Z TAF Issuance)
Issued at 1225 PM CDT Fri Aug 14 2026

As the increased moisture from the Gulf makes its way onshore a few isol shower/storms dot the s'rn portion of the area and continue to move northward. Gusty conditions up to 20kts will persist through the afternoon and into the evening. Winds will begin to chill out overnight to around 3-5kts. During this time the area west of I-45 will see the increasing chance for BR into the sunrise hours.
Tomorrow will follow the same pattern as today, only differnece is a decrease in rain chances.

CMW

MARINE
Issued at 1046 PM CDT Thu Aug 13 2026

Caution flags will remain in effect for the bays and Gulf waters through late tonight due to moderate onshore winds and seas of up to 5 feet. Winds will gradually decrease Friday and will continue mostly light through the upcoming work week as high pressure builds. Seas will decrease to 2-3 feet by early Saturday. A surge in moisture is expected on Friday and could lead to isolated to scattered shower and thunderstorms throughout the day. By Saturday, we will transition to a dry weather pattern as drier air moves in and the high pressure builds.

Cotto

PRELIMINARY POINT TEMPS/POPS
College Station (CLL) 77 99 74 99 / 0 0 0 0 Houston (IAH) 80 98 77 98 / 0 0 0 0 Galveston (GLS) 84 90 82 90 / 0 0 0 0

HGX WATCHES/WARNINGS/ADVISORIES
TX...None.
GM...None.