Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

68.4°F

Measurement Time: Saturday, January 10, 2026, 8:00 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

55°F
Overcast
Overcast
51°F
57.9°F
40%
N 15.2 mph
20.6 mph
55.2°F
26.3°F
0 in
100%
9 mi
1032 mbar
0

Five Day Weather Forecast

Sunny
Sun
H: 64°F
L: 53°F
Overcast
Mon
H: 69°F
L: 54°F
Cloudy
Tue
H: 69°F
L: 56°F
Partly Cloudy
Wed
H: 76°F
L: 58°F
Sunny
Thu
H: 67°F
L: 58°F

Air Quality

PM2.5: 5.45 μg/m3
PM10: 5.65 μg/m3
Carbon Monoxide: 157.85 μg/m3
Nitrogen Dioxide: 4.65 μg/m3
Sulphur Dioxide: 2.55 μg/m3
Ozone: 76 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:39 AM
Sunset: 5:59 PM
Daylight: 10 hrs 39 mins
Moonrise: 1:17 AM
Moon Transit: 6:57 AM
Moonset: 12:33 AM
Moon Phase: Last Quarter
Moon Illumination: 35.3%

Best Times for Fishing or Hunting

Major Periods

6:27 AM - 8:57 AM
5:43 PM - 8:13 PM

Minor Periods

12:03 AM - 1:33 PM
12:47 AM - 2:17 AM

Action Rating: 3 out of 5

Rip Current Statement issued January 10 at 4:34AM CST until January 11 at 6:00PM CST by NWS Brownsville TX

Effective: Sat January 10, 2026, 4:34 AM
Expires: Sun January 11, 2026, 6:00 PM

* WHAT...Dangerous rip currents expected. * WHERE...Kenedy Island, Willacy Island and Cameron Island Counties. * WHEN...Through Sunday afternoon. * IMPACTS...Rip currents can sweep even the best swimmers away from shore into deeper water.

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.
Sunday, January 11, 2026

Weather Forecast

Sunny
63.7°F
52.7°F
57.6°F
26%
0 in
0%
0%
16.6 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 5.84 μg/m3
PM10: 5.99 μg/m3
Carbon Monoxide: 161.45 μg/m3
Nitrogen Dioxide: 5.44 μg/m3
Sulphur Dioxide: 2.43 μg/m3
Ozone: 74.12 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:39 AM
Sunset: 5:59 PM
Daylight: 10 hrs 39 mins
Moonrise: 1:17 AM
Moon Transit: 6:57 AM
Moonset: 12:33 AM
Moon Phase: Last Quarter
Moon Illumination: 35.3%

Best Times for Fishing or Hunting

Major Periods

6:27 AM - 8:57 AM
5:43 PM - 8:13 PM

Minor Periods

12:03 AM - 1:33 PM
12:47 AM - 2:17 AM

Action Rating: 3 out of 5

Monday, January 12, 2026

Weather Forecast

Overcast
68.5°F
54.3°F
60.1°F
29%
0 in
0%
0%
7.4 mph
0.8


Air Quality

AQI: 1 - Good
PM2.5: 5.19 μg/m3
PM10: 5.27 μg/m3
Carbon Monoxide: 173.13 μg/m3
Nitrogen Dioxide: 7.15 μg/m3
Sulphur Dioxide: 3.02 μg/m3
Ozone: 61.76 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:40 AM
Sunset: 6:00 PM
Daylight: 10 hrs 39 mins
Moonrise: 2:11 AM
Moon Transit: 7:40 AM
Moonset: 1:06 PM
Moon Phase: Last Quarter
Moon Illumination: 25.0%

Best Times for Fishing or Hunting

Major Periods

7:10 AM - 9:40 AM
6:28 PM - 8:58 PM

Minor Periods

12:36 AM - 2:06 PM
1:41 AM - 3:11 AM

Action Rating: 4 out of 5

Tuesday, January 13, 2026

Weather Forecast

Cloudy
68.5°F
55.9°F
61.1°F
57%
0 in
0%
0%
9.4 mph
0.2


Air Quality

AQI: 1 - Good
PM2.5: 8.54 μg/m3
PM10: 9.16 μg/m3
Carbon Monoxide: 185.23 μg/m3
Nitrogen Dioxide: 11.24 μg/m3
Sulphur Dioxide: 3.46 μg/m3
Ozone: 47 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:40 AM
Sunset: 6:01 PM
Daylight: 10 hrs 40 mins
Moonrise: 3:05 AM
Moon Transit: 8:26 AM
Moonset: 1:44 PM
Moon Phase: Waning Crescent
Moon Illumination: 15.9%

Best Times for Fishing or Hunting

Major Periods

7:56 AM - 10:26 AM
7:15 PM - 9:45 PM

Minor Periods

1:14 PM - 2:44 PM
2:35 AM - 4:05 AM

Action Rating: 2 out of 5

Wednesday, January 14, 2026

Weather Forecast

Partly Cloudy
76.2°F
58.3°F
65.6°F
59%
0 in
0%
0%
10.1 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 13.83 μg/m3
PM10: 14.82 μg/m3
Carbon Monoxide: 211.43 μg/m3
Nitrogen Dioxide: 12.81 μg/m3
Sulphur Dioxide: 3.05 μg/m3
Ozone: 44.08 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:40 AM
Sunset: 6:01 PM
Daylight: 10 hrs 41 mins
Moonrise: 4:01 AM
Moon Transit: 9:15 AM
Moonset: 2:28 PM
Moon Phase: Waning Crescent
Moon Illumination: 8.5%

Best Times for Fishing or Hunting

Major Periods

8:45 AM - 11:15 AM
8:05 PM - 10:35 PM

Minor Periods

1:58 PM - 3:28 PM
3:31 AM - 5:01 AM

Action Rating: 2 out of 5

Thursday, January 15, 2026

Weather Forecast

Sunny
66.7°F
57.8°F
62.2°F
46%
0 in
0%
0%
15.4 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: 12:41 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

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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