Weather Forecast for Galveston

Texas, United States of America

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Sunny

Current Weather - Galveston: 27°C

Texas, United States of America

Sunny

Feels like 32°C

Wind

31 km/h S

Humidity

85%

Pressure

1013 mb

UV Index

10

Visibility

16 km

Heavy rain

Heavy rain

Sunday, June 21, 2026

High

31°C

Low

23°C

Rain Chance

81%

Hourly Forecast

Partly Cloudy 29°C
19:00
Partly Cloudy 28°C
20:00
Patchy rain nearby 28°C
21:00
Patchy rain nearby 29°C
22:00
Patchy rain nearby 29°C
23:00
Jun 22

Day Statistics

Maximum Wind

31 km/h

Humidity

85%

Precipitation

80 mm

UV Index

12

Visibility

10 km

Rain Chance

81%

Snow Chance

0%

Sun & Moon

Sunrise

06:20 AM

Sunset

08:21 PM

Moonrise

01:08 PM

Moonset

12:47 AM

Moon Phase

First Quarter

Moon Illumination

48%

Air Quality

PM2.5

9.7

μg/m³

PM10

15.4

μg/m³

NO₂

1.5

μg/m³

O₃

54.1

μg/m³

SO₂

0.7

μg/m³

CO

101.4

μg/m³

US EPA Index: 1 GB DEFRA Index: 1

Solar Radiation Data

Shortwave Radiation

456.77

Diffuse Radiation

103.55

DNI

0

GTI

0

Weather Alerts

Special Marine Warning issued June 21 at 6:55AM CDT until June 21 at 8:30AM CDT by NWS Houston/Galveston TX

Galveston Bay Jun 21, 06:55 AM - Jun 21, 08:30 AM
Severity: Severe Urgency: Immediate

SMWHGX The National Weather Service in League City has issued a * Special Marine Warning for... Galveston Bay... * Until 830 AM CDT. * At 655 AM CDT, a strong thunderstorm was located over southern Trinity Bay, moving northeast at 20 knots. HAZARD...Wind gusts 34 knots or greater. SOURCE...Radar. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. * Locations impacted include... Smith Point, East Galveston Bay, Mitchell Bay, Upper San Jacinto Bay, Scott Bay, Black Duck Bay, Galveston Bay, Tabbs Bay, Crystal Bay, Burnet Bay, Eagle Point, and Trinity Bay.

Move to safe harbor until hazardous weather passes.

Event: Special Marine Warning Certainty: Likely Category: Met

Flood Advisory issued June 21 at 5:34AM CDT until June 21 at 8:45AM CDT by NWS Houston/Galveston TX

Brazoria, TX; Fort Bend, TX; Galveston, TX; Harris, TX Jun 21, 05:34 AM - Jun 21, 08:45 AM
Severity: Minor Urgency: Expected

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of southeast Texas, including the following counties, Brazoria, Fort Bend, Galveston and Harris. * WHEN...Until 845 AM CDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Overflowing poor drainage areas. Ponding of water in urban or other areas is occurring or is imminent. * ADDITIONAL DETAILS... - At 534 AM CDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Up to 1 inch of rain has fallen. - Additional rainfall amounts of 1 to 2 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Southeastern Pasadena, Pearland, League City, southeastern Missouri City, Texas City, Friendswood, Alvin, Dickinson, Santa Fe, Seabrook, Webster, Hitchcock, Manvel, Kemah, Fresno, southern South Belt / Ellington, Clear Lake, Nassau Bay, Taylor Lake Village and El Lago. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. Please report observed flooding to local emergency services or law enforcement and request they pass this information to the National Weather Service when you can do so safely.

Event: Flood Advisory Certainty: Likely Category: Met

Flood Advisory issued June 21 at 7:04AM CDT until June 21 at 9:00AM CDT by NWS Houston/Galveston TX

Chambers, TX Jun 21, 07:04 AM - Jun 21, 09:00 AM
Severity: Minor Urgency: Expected

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of southeast Texas, including the following county, Chambers. * WHEN...Until 900 AM CDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 704 AM CDT, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 2.5 inches of rain have fallen. - Additional rainfall amounts of 1 to 2 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Anahuac, Smith Point, Oak Island and Wallisville. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Please report observed flooding to local emergency services or law enforcement and request they pass this information to the National Weather Service when you can do so safely.

Event: Flood Advisory Certainty: Likely Category: Met

Special Marine Warning issued June 21 at 6:28AM CDT until June 21 at 8:30AM CDT by NWS Houston/Galveston TX

Matagorda Bay; Galveston Bay; Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM; Coastal waters from High Island to Freeport TX out 20 NM; Waters from Freeport to Matagorda Ship Channel TX from 20 to 60 NM Jun 21, 06:28 AM - Jun 21, 08:30 AM
Severity: Severe Urgency: Immediate

SMWHGX The National Weather Service in League City has issued a * Special Marine Warning for... Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM... Coastal waters from High Island to Freeport TX out 20 NM... Galveston Bay... Matagorda Bay... Waters from Freeport to Matagorda Ship Channel TX from 20 to 60 NM... * Until 830 AM CDT. * At 627 AM CDT, a severe thunderstorm capable of producing waterspouts was located near Port Oconnor, moving northeast at 30 knots. HAZARD...Waterspouts and wind gusts to 40 knots. SOURCE...Radar. IMPACT...Waterspouts can easily overturn boats and create locally hazardous seas. Small craft could be damaged in briefly higher winds and suddenly higher waves. * Locations impacted include... Brazos 400, Matagorda Ship Channel, Brazos 439, Matagorda Island 557, Galveston 344, Drum Bay, Palacios Bay, Galveston 282, Tabs Buoy W, San Luis Pass, Turtle Bay, Surfside Jetty, Brazos 490, East Matagorda Bay, Christmas Bay, Matagorda Jetty, Bastrop Bay, and southwestern West Bay.

Move to safe harbor until hazardous weather passes. Thunderstorms can produce sudden waterspouts. Waterspouts can easily overturn boats and create locally hazardous seas. Seek safe harbor immediately. Frequent lightning is occurring with this storm. If caught on the open water stay below deck if possible, keep away from ungrounded metal objects.

Event: Special Marine Warning Certainty: Likely Category: Met

Flood Advisory issued June 21 at 8:52AM CDT until June 21 at 12:00PM CDT by NWS Houston/Galveston TX

Brazoria, TX; Galveston, TX Jun 21, 08:52 AM - Jun 21, 12:00 PM
Severity: Minor Urgency: Expected

* WHAT...Small stream flooding caused by excessive rainfall is occurring. * WHERE...A portion of southeast Texas, including the following counties, Brazoria and Galveston. * WHEN...Until noon CDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. River or stream flows are elevated. * ADDITIONAL DETAILS... - At 851 AM CDT, gauge reports indicated heavy rain due to thunderstorms. This is causing small stream flooding. - Minor flooding is in progress along Old Chigger Creek near SH 35 and Windsong Lane. This will likely be transitioned to an Areal Flood Warning once rainfall comes to an end later this morning. - Some locations that will experience flooding include... Southwestern League City, southwestern Friendswood, Alvin and Santa Fe. - http://www.weather.gov/safety/flood

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads.

Event: Flood Advisory Certainty: Likely Category: Met