Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

78.1°F

Measurement Time: Saturday, May 2, 2026, 12:00 PM CDT

Temperature Locations

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Local Points of Interest

Mercedes Settling Basin; Matamoros Municipality, Mexico

Rio Grande

Station Name: Rio Grande nr Mercedes, TX
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 76 feet

Nearest Address:
Mercedes, TX 78570
Hidalgo County

GPS Coordinates: 26.0615722, -97.8999833

Nearby Water Temperatures

Rio Grande, Los Indios, TX (8.5 mi)
Rio Grande, Mission, TX (27.5 mi)
Rio Grande, Mission, TX (29.8 mi)
Rio Grande, Mission, TX (32.5 mi)
Laguna Madre, Bayview, TX (40.6 mi)
Port Isabel Channel, Port Isabel, TX (42.5 mi)
Laguna Madre, South Padre Island, TX (45.5 mi)
Brownsville Ship Channel, South Padre Island, TX (46.3 mi)
Laguna Madre, Armstrong, TX (57.6 mi)
Rio Grande, Rio Grande City, TX (59.2 mi)
Rio Grande, Roma, TX (73.1 mi)
Baffin Bay, Kingsville, TX (90.7 mi)
Gulf Intracoastal Waterway, Corpus Christi, TX (104.6 mi)
Packery Channel, Corpus Christi, TX (116.1 mi)
Corpus Christi Bay, Corpus Christi, TX (124.9 mi)

Weather for Mercedes, Texas

Current Weather

71.1°F
Overcast
Overcast
71.1°F
76°F
61%
NNE 14.8 mph
17 mph
72.4°F
59°F
0 in
100%
9 mi
1018 mbar
3.2

Five Day Weather Forecast

Patchy rain nearby
Sat
H: 73°F
L: 61°F
Sunny
Sun
H: 82°F
L: 61°F
Partly Cloudy
Mon
H: 84°F
L: 67°F
Partly Cloudy
Tue
H: 90°F
L: 73°F
Partly Cloudy
Wed
H: 100°F
L: 77°F

Air Quality

AQI: 1 - Good
PM2.5: 6.55 μg/m3
PM10: 7.85 μg/m3
Carbon Monoxide: 159.85 μg/m3
Nitrogen Dioxide: 8.55 μg/m3
Sulphur Dioxide: 2.15 μg/m3
Ozone: 100 μg/m3

Astronomical

Sunrise: 6:54 AM
Sun Transit: 1:28 PM
Sunset: 8:04 PM
Daylight: 13 hrs 10 mins
Moonrise: 9:17 PM
Moon Transit: 1:47 AM
Moonset: 7:10 AM
Moon Phase: Full
Moon Illumination: 98.4%

Best Times for Fishing or Hunting

Major Periods

1:17 AM - 3:47 AM
12:35 AM - 3:05 PM

Minor Periods

8:47 PM - 10:17 PM
6:40 AM - 8:10 AM

Action Rating: 4 out of 5

Coastal Flood Statement issued May 2 at 2:09AM CDT until May 2 at 2:00PM CDT by NWS Brownsville TX

Effective: Sat May 2, 2026, 2:09 AM
Expires: Sat May 2, 2026, 1:00 PM

* WHAT...For the High Rip Current Risk, dangerous rip currents. For the High Surf Advisory, large breaking waves of 3 to 9 feet in the surf zone. For the Coastal Flood Statement, isolated minor coastal flooding expected. * WHERE...Kenedy Island, Willacy Island and Cameron Island Counties. * WHEN...For the High Rip Current Risk, through Sunday evening. For the High Surf Advisory, until 1 AM CDT Sunday. For the Coastal Flood Statement, until 2 PM CDT this afternoon. * IMPACTS...Wave run-up may approach the dunes along narrow beaches. Beach equipment, such as umbrellas and chairs, could be moved by waves. Vehicles driving along narrow beaches may experience higher water levels. Elevated water levels may also occur across the Laguna Madre and South Bay, and along State Highway 4 west of Boca Chica State Park. Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

Do not drive through flooded roadways. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.


High Surf Advisory issued May 2 at 2:09AM CDT until May 3 at 1:00AM CDT by NWS Brownsville TX

Effective: Sat May 2, 2026, 2:09 AM
Expires: Sat May 2, 2026, 1:00 PM

* WHAT...For the High Rip Current Risk, dangerous rip currents. For the High Surf Advisory, large breaking waves of 3 to 9 feet in the surf zone. For the Coastal Flood Statement, isolated minor coastal flooding expected. * WHERE...Kenedy Island, Willacy Island and Cameron Island Counties. * WHEN...For the High Rip Current Risk, through Sunday evening. For the High Surf Advisory, until 1 AM CDT Sunday. For the Coastal Flood Statement, until 2 PM CDT this afternoon. * IMPACTS...Wave run-up may approach the dunes along narrow beaches. Beach equipment, such as umbrellas and chairs, could be moved by waves. Vehicles driving along narrow beaches may experience higher water levels. Elevated water levels may also occur across the Laguna Madre and South Bay, and along State Highway 4 west of Boca Chica State Park. Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

Do not drive through flooded roadways. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.


Rip Current Statement issued May 2 at 2:09AM CDT until May 3 at 7:00PM CDT by NWS Brownsville TX

Effective: Sat May 2, 2026, 2:09 AM
Expires: Sat May 2, 2026, 1:00 PM

* WHAT...For the High Rip Current Risk, dangerous rip currents. For the High Surf Advisory, large breaking waves of 3 to 9 feet in the surf zone. For the Coastal Flood Statement, isolated minor coastal flooding expected. * WHERE...Kenedy Island, Willacy Island and Cameron Island Counties. * WHEN...For the High Rip Current Risk, through Sunday evening. For the High Surf Advisory, until 1 AM CDT Sunday. For the Coastal Flood Statement, until 2 PM CDT this afternoon. * IMPACTS...Wave run-up may approach the dunes along narrow beaches. Beach equipment, such as umbrellas and chairs, could be moved by waves. Vehicles driving along narrow beaches may experience higher water levels. Elevated water levels may also occur across the Laguna Madre and South Bay, and along State Highway 4 west of Boca Chica State Park. Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

Do not drive through flooded roadways. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.


Saturday, May 2, 2026

Weather Forecast

Patchy rain nearby
73.2°F
61.2°F
66.3°F
76%
0.09 in
86%
0%
19 mph
6.6


Air Quality

AQI: 1 - Good
PM2.5: 3.93 μg/m3
PM10: 4.23 μg/m3
Carbon Monoxide: 151.05 μg/m3
Nitrogen Dioxide: 4.27 μg/m3
Sulphur Dioxide: 1.71 μg/m3
Ozone: 84.04 μg/m3

Astronomical

Sunrise: 6:54 AM
Sun Transit: 1:28 PM
Sunset: 8:04 PM
Daylight: 13 hrs 10 mins
Moonrise: 9:17 PM
Moon Transit: 1:47 AM
Moonset: 7:10 AM
Moon Phase: Full
Moon Illumination: 98.4%

Best Times for Fishing or Hunting

Major Periods

1:17 AM - 3:47 AM
12:35 AM - 3:05 PM

Minor Periods

8:47 PM - 10:17 PM
6:40 AM - 8:10 AM

Action Rating: 4 out of 5

Sunday, May 3, 2026

Weather Forecast

Sunny
81.9°F
61.2°F
70.9°F
59%
0 in
0%
0%
15.2 mph
10.5


Air Quality

AQI: 1 - Good
PM2.5: 8.76 μg/m3
PM10: 11.59 μg/m3
Carbon Monoxide: 166.57 μg/m3
Nitrogen Dioxide: 8.1 μg/m3
Sulphur Dioxide: 2.28 μg/m3
Ozone: 104.68 μg/m3

Astronomical

Sunrise: 6:53 AM
Sun Transit: 1:28 PM
Sunset: 8:05 PM
Daylight: 13 hrs 11 mins
Moonrise: 10:13 PM
Moon Transit: 2:35 AM
Moonset: 7:51 AM
Moon Phase: Full
Moon Illumination: 94.4%

Best Times for Fishing or Hunting

Major Periods

2:05 AM - 4:35 AM
1:24 PM - 3:54 PM

Minor Periods

9:43 PM - 11:13 PM
7:21 AM - 8:51 AM

Action Rating: 4 out of 5

Monday, May 4, 2026

Weather Forecast

Partly Cloudy
83.6°F
66.6°F
74.6°F
69%
0 in
0%
0%
15 mph
6.7


Air Quality

AQI: 1 - Good
PM2.5: 9.2 μg/m3
PM10: 12.07 μg/m3
Carbon Monoxide: 149.49 μg/m3
Nitrogen Dioxide: 6.63 μg/m3
Sulphur Dioxide: 1.76 μg/m3
Ozone: 91.24 μg/m3

Astronomical

Sunrise: 6:52 AM
Sun Transit: 1:28 PM
Sunset: 8:05 PM
Daylight: 13 hrs 13 mins
Moonrise: 11:07 PM
Moon Transit: 3:25 AM
Moonset: 8:36 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.0%

Best Times for Fishing or Hunting

Major Periods

2:55 AM - 5:25 AM
2:15 PM - 4:45 PM

Minor Periods

12:00 AM - 12:00 AM
8:06 AM - 9:36 AM

Action Rating: 2 out of 5

Tuesday, May 5, 2026

Weather Forecast

Partly Cloudy
89.8°F
72.7°F
80.2°F
73%
0 in
0%
0%
22.8 mph
11.1


Air Quality

AQI: 1 - Good
PM2.5: 7.48 μg/m3
PM10: 9.28 μg/m3
Carbon Monoxide: 147.66 μg/m3
Nitrogen Dioxide: 3.47 μg/m3
Sulphur Dioxide: 1.55 μg/m3
Ozone: 83.36 μg/m3

Astronomical

Sunrise: 6:52 AM
Sun Transit: 1:28 PM
Sunset: 8:06 PM
Daylight: 13 hrs 14 mins
Moonrise: 12:07 AM
Moon Transit: 4:16 AM
Moonset: 9:26 AM
Moon Phase: Waning Gibbous
Moon Illumination: 79.8%

Best Times for Fishing or Hunting

Major Periods

3:46 AM - 6:16 AM
3:06 PM - 5:36 PM

Minor Periods

8:56 AM - 10:26 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, May 6, 2026

Weather Forecast

Partly Cloudy
99.5°F
76.5°F
85.1°F
71%
0 in
0%
0%
20.1 mph
9.8


Air Quality

AQI: 1 - Good
PM2.5: 8.27 μg/m3
PM10: 9.87 μg/m3
Carbon Monoxide: 208.93 μg/m3
Nitrogen Dioxide: 3.43 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 73.23 μg/m3

Astronomical

Sunrise: 6:51 AM
Sun Transit: 1:28 PM
Sunset: 8:06 PM
Daylight: 13 hrs 15 mins
Moonrise: 12:58 AM
Moon Transit: 5:08 AM
Moonset: 10:20 AM
Moon Phase: Waning Gibbous
Moon Illumination: 70.0%

Best Times for Fishing or Hunting

Major Periods

4:38 AM - 7:08 AM
3:57 PM - 6:27 PM

Minor Periods

9:50 AM - 11:20 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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