Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

62.2°F

Measurement Time: Wednesday, January 14, 2026, 10:00 PM CST

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

48.9°F
Clear
Clear
45.5°F
53.6°F
59%
N 7.8 mph
14 mph
50.1°F
30.8°F
0 in
0%
9 mi
1024 mbar
0

Five Day Weather Forecast

Sunny
Thu
H: 69°F
L: 48°F
Sunny
Fri
H: 78°F
L: 45°F
Overcast
Sat
H: 62°F
L: 56°F
Sunny
Sun
H: 64°F
L: 46°F
Partly Cloudy
Mon
H: 70°F
L: 56°F

Air Quality

PM2.5: 2.85 μg/m3
PM10: 2.85 μg/m3
Carbon Monoxide: 160.85 μg/m3
Nitrogen Dioxide: 6.75 μg/m3
Sulphur Dioxide: 2.35 μg/m3
Ozone: 59 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:41 AM
Sunset: 6:02 PM
Daylight: 10 hrs 42 mins
Moonrise: 4:57 AM
Moon Transit: 10:06 AM
Moonset: 3:15 PM
Moon Phase: Waning Crescent
Moon Illumination: 3.3%

Best Times for Fishing or Hunting

Major Periods

8:57 PM - 11:27 PM
9:36 AM - 12:06 AM

Minor Periods

2:45 PM - 4:15 PM
4:27 AM - 5:57 AM

Action Rating: 2 out of 5

High Surf Advisory issued January 14 at 11:38AM CST until January 15 at 12:00PM CST by NWS Brownsville TX

Effective: Wed January 14, 2026, 11:38 AM
Expires: Thu January 15, 2026, 12:00 AM

* WHAT...For the High Rip Current Risk, dangerous rip currents expected. For the High Surf Advisory, large breaking waves of 6 to 8 feet expected in the surf zone. * WHERE...Kenedy Island, Willacy Island and Cameron Island Counties. * WHEN...For the High Rip Current Risk, from 6 PM CST this evening through Thursday afternoon. For the High Surf Advisory, from 3 AM to noon CST Thursday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

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 January 14 at 11:38AM CST until January 15 at 6:00PM CST by NWS Brownsville TX

Effective: Wed January 14, 2026, 11:38 AM
Expires: Thu January 15, 2026, 12:00 AM

* WHAT...For the High Rip Current Risk, dangerous rip currents expected. For the High Surf Advisory, large breaking waves of 6 to 8 feet expected in the surf zone. * WHERE...Kenedy Island, Willacy Island and Cameron Island Counties. * WHEN...For the High Rip Current Risk, from 6 PM CST this evening through Thursday afternoon. For the High Surf Advisory, from 3 AM to noon CST Thursday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

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 January 14 at 10:10PM CST until January 15 at 12:00PM CST by NWS Brownsville TX

Effective: Wed January 14, 2026, 10:10 PM
Expires: Thu January 15, 2026, 12:00 PM

* WHAT...For the High Rip Current Risk, dangerous rip currents. For the High Surf Advisory, large breaking waves of 4 to 6 feet expected in the surf zone. * WHERE...Kenedy Island, Willacy Island and Cameron Island Counties. * WHEN...For the High Rip Current Risk, through Thursday afternoon. For the High Surf Advisory, from 3 AM to noon CST Thursday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

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 January 14 at 10:10PM CST until January 15 at 6:00PM CST by NWS Brownsville TX

Effective: Wed January 14, 2026, 10:10 PM
Expires: Thu January 15, 2026, 12:00 PM

* WHAT...For the High Rip Current Risk, dangerous rip currents. For the High Surf Advisory, large breaking waves of 4 to 6 feet expected in the surf zone. * WHERE...Kenedy Island, Willacy Island and Cameron Island Counties. * WHEN...For the High Rip Current Risk, through Thursday afternoon. For the High Surf Advisory, from 3 AM to noon CST Thursday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

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.
Thursday, January 15, 2026

Weather Forecast

Sunny
69.3°F
47.8°F
58.4°F
44%
0 in
0%
0%
12.3 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 4.71 μg/m3
PM10: 4.83 μg/m3
Carbon Monoxide: 159.69 μg/m3
Nitrogen Dioxide: 6.57 μg/m3
Sulphur Dioxide: 2.38 μg/m3
Ozone: 68.28 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:41 AM
Sunset: 6:02 PM
Daylight: 10 hrs 42 mins
Moonrise: 4:57 AM
Moon Transit: 10:06 AM
Moonset: 3:15 PM
Moon Phase: Waning Crescent
Moon Illumination: 3.3%

Best Times for Fishing or Hunting

Major Periods

8:57 PM - 11:27 PM
9:36 AM - 12:06 AM

Minor Periods

2:45 PM - 4:15 PM
4:27 AM - 5:57 AM

Action Rating: 2 out of 5

Friday, January 16, 2026

Weather Forecast

Sunny
77.9°F
44.6°F
59.2°F
71%
0 in
0%
0%
18.6 mph
1.1


Air Quality

AQI: 1 - Good
PM2.5: 5.73 μg/m3
PM10: 6.4 μg/m3
Carbon Monoxide: 175.01 μg/m3
Nitrogen Dioxide: 6.66 μg/m3
Sulphur Dioxide: 2.37 μg/m3
Ozone: 73 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:41 AM
Sunset: 6:03 PM
Daylight: 10 hrs 43 mins
Moonrise: 5:50 AM
Moon Transit: 10:58 AM
Moonset: 4:09 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:28 AM - 12:58 AM

Minor Periods

3:39 PM - 5:09 PM
5:20 AM - 6:50 AM

Action Rating: 2 out of 5

Saturday, January 17, 2026

Weather Forecast

Overcast
62.4°F
56°F
59.6°F
83%
0 in
0%
0%
27.3 mph
0.8


Air Quality

AQI: 1 - Good
PM2.5: 9.12 μg/m3
PM10: 11.31 μg/m3
Carbon Monoxide: 158.25 μg/m3
Nitrogen Dioxide: 7.55 μg/m3
Sulphur Dioxide: 2.33 μg/m3
Ozone: 71.24 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:41 AM
Sunset: 6:04 PM
Daylight: 10 hrs 44 mins
Moonrise: 6:40 AM
Moon Transit: 11:51 AM
Moonset: 5:06 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:21 AM - 1:51 PM

Minor Periods

4:36 PM - 6:06 PM
6:10 AM - 7:40 AM

Action Rating: 5 out of 5

Sunday, January 18, 2026

Weather Forecast

Sunny
64.3°F
46°F
54.8°F
48%
0 in
0%
0%
22.6 mph
1.1


Air Quality

AQI: 1 - Good
PM2.5: 13.13 μg/m3
PM10: 15.62 μg/m3
Carbon Monoxide: 215.2 μg/m3
Nitrogen Dioxide: 13.07 μg/m3
Sulphur Dioxide: 2.85 μg/m3
Ozone: 55.46 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:42 AM
Sunset: 6:04 PM
Daylight: 10 hrs 45 mins
Moonrise: 7:24 AM
Moon Transit: 12:42 AM
Moonset: 6:05 PM
Moon Phase: New
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:12 AM - 2:42 PM

Minor Periods

5:35 PM - 7:05 PM
6:54 AM - 8:24 AM

Action Rating: 5 out of 5

Monday, January 19, 2026

Weather Forecast

Partly Cloudy
70.3°F
56.3°F
61°F
71%
0 in
0%
0%
18.3 mph
0


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:42 AM
Sunset: 6:05 PM
Daylight: 10 hrs 45 mins
Moonrise: 8:05 AM
Moon Transit: 1:32 PM
Moonset: 7:04 PM
Moon Phase: New
Moon Illumination: 0.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:02 PM - 3:32 PM

Minor Periods

6:34 PM - 8:04 PM
7:35 AM - 9:05 AM

Action Rating: 5 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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