Marine Weather and Tide Forecast for Katy, TX
April 18, 2025 1:11 AM CDT (06:11 UTC) Change Location
![]() | Sunrise 6:51 AM Sunset 7:53 PM Moonrise 12:00 AM Moonset 9:25 AM |
GMZ335 Galveston Bay- 1239 Am Cdt Fri Apr 18 2025
.small craft advisory in effect until 10 am cdt this morning - .
Rest of tonight - South winds 15 to 20 knots gusting up to 25 knots. Bay waters choppy.
Friday - South winds 15 to 20 knots. Bay waters choppy.
Friday night - Southeast winds 15 to 20 knots. Bay waters choppy.
Saturday - Southeast winds around 20 knots, easing to around 15 knots in the late morning and afternoon. Bay waters choppy, easing to slightly choppy to choppy in the late morning and afternoon.
Saturday night - Southeast winds around 20 knots. Bay waters choppy.
Sunday - South winds 15 to 20 knots. Bay waters choppy. A chance of showers and Thunderstorms in the morning, then showers likely in the afternoon.
Sunday night - South winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers and Thunderstorms.
Monday - Southeast winds around 10 knots. Bay waters smooth to slightly choppy. A chance of showers and Thunderstorms in the morning.
Monday night - Southeast winds 5 to 10 knots. Bay waters smooth.
Tuesday - Southeast winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms.
Tuesday night - Southeast winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers and Thunderstorms after midnight.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 1239 Am Cdt Fri Apr 18 2025
Synopsis for high island to the matagorda ship channel out 60 nm including galveston and matagorda bays
a long fetch of moderate south and southeast winds will continue across the western gulf through the weekend. This will drive up winds and seas along the upper texas coast resulting in periods of small craft advisory conditions. Rip current risk is expected to be elevated as well. Decreasing winds and seas are expected on Sunday into Monday, before increasing somewhat by the middle of the week. Shower and Thunderstorm chances will increase Sunday and into next week as increased gulf moisture interacts with a series of upper level disturbances passing overhead.
a long fetch of moderate south and southeast winds will continue across the western gulf through the weekend. This will drive up winds and seas along the upper texas coast resulting in periods of small craft advisory conditions. Rip current risk is expected to be elevated as well. Decreasing winds and seas are expected on Sunday into Monday, before increasing somewhat by the middle of the week. Shower and Thunderstorm chances will increase Sunday and into next week as increased gulf moisture interacts with a series of upper level disturbances passing overhead.
7 Day Forecast for Marine Location Near Katy, TX

NEW! Add second zone forecast
Lynchburg Landing Click for Map Thu -- 06:07 AM CDT -0.02 feet Low Tide Thu -- 06:51 AM CDT Sunrise Thu -- 09:30 AM CDT Moonset Thu -- 04:05 PM CDT 1.33 feet High Tide Thu -- 07:48 PM CDT Sunset Tide / Current data from XTide NOT FOR NAVIGATION |   |
Lynchburg Landing, San Jacinto River, Texas, Tide feet
12 am |
0.9 |
1 am |
0.7 |
2 am |
0.5 |
3 am |
0.3 |
4 am |
0.1 |
5 am |
0 |
6 am |
-0 |
7 am |
0 |
8 am |
0.1 |
9 am |
0.3 |
10 am |
0.5 |
11 am |
0.8 |
12 pm |
1 |
1 pm |
1.2 |
2 pm |
1.3 |
3 pm |
1.3 |
4 pm |
1.3 |
5 pm |
1.3 |
6 pm |
1.3 |
7 pm |
1.3 |
8 pm |
1.2 |
9 pm |
1.2 |
10 pm |
1.2 |
11 pm |
1.1 |
Clear Lake Click for Map Thu -- 06:51 AM CDT Sunrise Thu -- 07:17 AM CDT -0.14 feet Low Tide Thu -- 09:31 AM CDT Moonset Thu -- 04:45 PM CDT 0.76 feet High Tide Thu -- 07:48 PM CDT Sunset Tide / Current data from XTide NOT FOR NAVIGATION |   |
Clear Lake, Harris Co. Park, Texas, Tide feet
12 am |
0.6 |
1 am |
0.6 |
2 am |
0.5 |
3 am |
0.3 |
4 am |
0.1 |
5 am |
0 |
6 am |
-0.1 |
7 am |
-0.1 |
8 am |
-0.1 |
9 am |
-0.1 |
10 am |
0 |
11 am |
0.2 |
12 pm |
0.4 |
1 pm |
0.5 |
2 pm |
0.6 |
3 pm |
0.7 |
4 pm |
0.8 |
5 pm |
0.8 |
6 pm |
0.8 |
7 pm |
0.7 |
8 pm |
0.7 |
9 pm |
0.7 |
10 pm |
0.7 |
11 pm |
0.7 |
Area Discussion for Houston/Galveston, TX
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FXUS64 KHGX 180525 AFDHGX
Area Forecast Discussion National Weather Service Houston/Galveston TX 1225 AM CDT Fri Apr 18 2025
New MARINE
SHORT TERM
(This evening through Friday Night)
Issued at 322 PM CDT Thu Apr 17 2025
The warming trend continues as ridging aloft remains in place this afternoon paired with 850mb temperatures at or above the 90th percentile as southwesterly flow aloft prevails. This has led to widespread temperatures this afternoon in the low to mid 80s...and the warming trend doesn't stop there! The 90s are making a comeback, but before we talk about that...let's discuss what's going on synoptically. The ridge axis currently in place will be gradually nudged eastward as a deep layer trough moves in from the western CONUS. Surface low pressure will develop in the Southern Plains in advance of that trough leading to a tightening pressure gradient.
This is especially evident at 850mb where a nocturnally strengthening LLJ will be overhead. Winds at 850mb in the daytime will be around 30-40 kt and increase to 40-50 kt overnight...some of those stronger winds will mix down to the surface leading to gusty southerly winds both this afternoon and Friday afternoon as well.
Areas west of the Brazos River and right along the coast will be on the borderline for a Wind Advisory as sustained winds will be 15-25 mph with gusts up to 20-30+ mph at times.
Because of the gusty winds lingering into the nighttime along with increasing low-level cloud cover...not expecting much of a cooldown overnight. Low temperatures tonight and Friday night will be in the upper 60s to low 70s. Now back to the warming trend! With a favorable WAA pattern continuing, high temperatures on Friday will top out in the upper 80s to low 90s...which could approach a couple of records but most of them "should" remain untouched. Friday is also when we finally see PW values rise above 1.0" and approach the 75th percentile (~1.34"), but there's not much lift for that moisture until we get to the weekend. What that does mean though is that we could classify Friday as hot and humid, so plan your outfits accordingly. At least there will be a breeze to keep you kinda cool though!
Batiste
LONG TERM
(Sunday through next Thursday)
Issued at 1152 PM CDT Thu Apr 17 2025
A well stacked low pressure system is expected push northeastward from Oklahoma to Missouri on Easter Sunday. The low's trailing front will slowly push southeastward across SE TX on Sunday into Monday. The environment is expected to be highly sheared during the first half of Sunday. Afterward, shear gradually subsides as the low pushes north and takes much of its hear with it. However, small disturbances in the flow aloft, coupled with LL convergence from the front and ample moisture and instability should allow the development of at least scattered showers and isolated thunderstorms. But we cannot rule out the presence of deeper convection and a few stronger / heavier thunderstorms on Sunday.
The front becomes increasingly diffused on Monday but could still provide enough forcing to spark scattered shower and thunderstorm activity on Monday.
Beyond Monday, the flow pattern becomes more zonal with a continuous train of upper level disturbances. Therefore, the chance of showers and thunderstorms remains elevated through the duration of the long term. Regarding temperatures, expect generally warm and humid conditions with highs in the 80s and lows in the mid 60s to low 70s.
Self
AVIATION
(06Z TAF Issuance)
Issued at 1121 PM CDT Thu Apr 17 2025
Widespread MVFR conditions are expected through mid-morning. A few terminals may see SCT MVFR ceilings at times; however, BKN ceilings look to prevail. Conditions will improve to VFR after late Friday morning, but it will only last through the afternoon.
MVFR conditions return early in the evening with ceilings dropping from south to north through the night. In terms of winds, a LLJ is moving overhead, resulting in gusty surface winds at times; especially across our northern terminals through the night.
Southerly gusty winds continue on Friday, with the higher gusts late in the morning and in the afternoon.
JM
MARINE
Issued at 1223 AM CDT Fri Apr 18 2025
Enhanced southeasterly fetch will continue into the weekend, bringing hazardous Gulf seas and periods of Small Craft Winds. The rip current risk is likely to be elevated as well. Water levels could approach 3 feet above MLLW during the high tide cycles this weekend. Therefore, minor coastal flooding could not be ruled out.
Current forecast water levels remain below coastal flood advisory levels. Winds are expected to weaken on Sunday and Monday. However, there will be an increasing chance of showers and thunderstorms during the Sunday to Monday time frame. Southeasterly winds may increase again by the middle of next week with a continuing chance of showers and thunderstorms.
PRELIMINARY POINT TEMPS/POPS
College Station (CLL) 90 70 86 68 / 0 0 20 20 Houston (IAH) 90 72 85 72 / 0 0 10 10 Galveston (GLS) 81 74 80 73 / 0 0 0 0
HGX WATCHES/WARNINGS/ADVISORIES
TX...None.
GM...Small Craft Advisory until 10 AM CDT this morning for GMZ330-335.
Small Craft Advisory until 4 PM CDT this afternoon for GMZ350- 355-370-375.
Area Forecast Discussion National Weather Service Houston/Galveston TX 1225 AM CDT Fri Apr 18 2025
New MARINE
SHORT TERM
(This evening through Friday Night)
Issued at 322 PM CDT Thu Apr 17 2025
The warming trend continues as ridging aloft remains in place this afternoon paired with 850mb temperatures at or above the 90th percentile as southwesterly flow aloft prevails. This has led to widespread temperatures this afternoon in the low to mid 80s...and the warming trend doesn't stop there! The 90s are making a comeback, but before we talk about that...let's discuss what's going on synoptically. The ridge axis currently in place will be gradually nudged eastward as a deep layer trough moves in from the western CONUS. Surface low pressure will develop in the Southern Plains in advance of that trough leading to a tightening pressure gradient.
This is especially evident at 850mb where a nocturnally strengthening LLJ will be overhead. Winds at 850mb in the daytime will be around 30-40 kt and increase to 40-50 kt overnight...some of those stronger winds will mix down to the surface leading to gusty southerly winds both this afternoon and Friday afternoon as well.
Areas west of the Brazos River and right along the coast will be on the borderline for a Wind Advisory as sustained winds will be 15-25 mph with gusts up to 20-30+ mph at times.
Because of the gusty winds lingering into the nighttime along with increasing low-level cloud cover...not expecting much of a cooldown overnight. Low temperatures tonight and Friday night will be in the upper 60s to low 70s. Now back to the warming trend! With a favorable WAA pattern continuing, high temperatures on Friday will top out in the upper 80s to low 90s...which could approach a couple of records but most of them "should" remain untouched. Friday is also when we finally see PW values rise above 1.0" and approach the 75th percentile (~1.34"), but there's not much lift for that moisture until we get to the weekend. What that does mean though is that we could classify Friday as hot and humid, so plan your outfits accordingly. At least there will be a breeze to keep you kinda cool though!
Batiste
LONG TERM
(Sunday through next Thursday)
Issued at 1152 PM CDT Thu Apr 17 2025
A well stacked low pressure system is expected push northeastward from Oklahoma to Missouri on Easter Sunday. The low's trailing front will slowly push southeastward across SE TX on Sunday into Monday. The environment is expected to be highly sheared during the first half of Sunday. Afterward, shear gradually subsides as the low pushes north and takes much of its hear with it. However, small disturbances in the flow aloft, coupled with LL convergence from the front and ample moisture and instability should allow the development of at least scattered showers and isolated thunderstorms. But we cannot rule out the presence of deeper convection and a few stronger / heavier thunderstorms on Sunday.
The front becomes increasingly diffused on Monday but could still provide enough forcing to spark scattered shower and thunderstorm activity on Monday.
Beyond Monday, the flow pattern becomes more zonal with a continuous train of upper level disturbances. Therefore, the chance of showers and thunderstorms remains elevated through the duration of the long term. Regarding temperatures, expect generally warm and humid conditions with highs in the 80s and lows in the mid 60s to low 70s.
Self
AVIATION
(06Z TAF Issuance)
Issued at 1121 PM CDT Thu Apr 17 2025
Widespread MVFR conditions are expected through mid-morning. A few terminals may see SCT MVFR ceilings at times; however, BKN ceilings look to prevail. Conditions will improve to VFR after late Friday morning, but it will only last through the afternoon.
MVFR conditions return early in the evening with ceilings dropping from south to north through the night. In terms of winds, a LLJ is moving overhead, resulting in gusty surface winds at times; especially across our northern terminals through the night.
Southerly gusty winds continue on Friday, with the higher gusts late in the morning and in the afternoon.
JM
MARINE
Issued at 1223 AM CDT Fri Apr 18 2025
Enhanced southeasterly fetch will continue into the weekend, bringing hazardous Gulf seas and periods of Small Craft Winds. The rip current risk is likely to be elevated as well. Water levels could approach 3 feet above MLLW during the high tide cycles this weekend. Therefore, minor coastal flooding could not be ruled out.
Current forecast water levels remain below coastal flood advisory levels. Winds are expected to weaken on Sunday and Monday. However, there will be an increasing chance of showers and thunderstorms during the Sunday to Monday time frame. Southeasterly winds may increase again by the middle of next week with a continuing chance of showers and thunderstorms.
PRELIMINARY POINT TEMPS/POPS
College Station (CLL) 90 70 86 68 / 0 0 20 20 Houston (IAH) 90 72 85 72 / 0 0 10 10 Galveston (GLS) 81 74 80 73 / 0 0 0 0
HGX WATCHES/WARNINGS/ADVISORIES
TX...None.
GM...Small Craft Advisory until 10 AM CDT this morning for GMZ330-335.
Small Craft Advisory until 4 PM CDT this afternoon for GMZ350- 355-370-375.
Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
NCHT2 - 8770777 - Manchester, TX | 29 mi | 53 min | SSW 11G | 74°F | 76°F | 29.91 | ||
MGPT2 - 8770613 - Morgans Point, TX | 44 mi | 53 min | 75°F | 29.95 |
Wind History for Manchester, TX
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Airport Reports
Link to 1 hour of 5 minute data for KTME
Terminal Aerodrome Forecast (TAF) for KTME
Wind History Graph: TME
(wind in knots)GEOS Local Image of southern planes -- texas
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Houston/Galveston, TX,

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