Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

62.2°F

Measurement Time: Sunday, January 11, 2026, 9:00 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

51.1°F
Partly cloudy
Partly cloudy
49.3°F
50.4°F
35%
NW 5.4 mph
8.4 mph
47.2°F
26.1°F
0 in
75%
9 mi
1031 mbar
0

Five Day Weather Forecast

Sunny
Mon
H: 70°F
L: 50°F
Cloudy
Tue
H: 66°F
L: 55°F
Partly Cloudy
Wed
H: 77°F
L: 54°F
Sunny
Thu
H: 67°F
L: 53°F
Sunny
Fri
H: 72°F
L: 52°F

Air Quality

AQI: 1 - Good
PM2.5: 7.75 μg/m3
PM10: 8.05 μg/m3
Carbon Monoxide: 200.85 μg/m3
Nitrogen Dioxide: 10.45 μg/m3
Sulphur Dioxide: 3.25 μg/m3
Ozone: 37 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

Monday, January 12, 2026

Weather Forecast

Sunny
70°F
49.6°F
58.1°F
35%
0 in
0%
0%
11 mph
0.8


Air Quality

AQI: 1 - Good
PM2.5: 7.75 μg/m3
PM10: 8.11 μg/m3
Carbon Monoxide: 183.37 μg/m3
Nitrogen Dioxide: 9.15 μg/m3
Sulphur Dioxide: 3.14 μg/m3
Ozone: 57.28 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
66.2°F
55°F
59.9°F
38%
0 in
0%
0%
9.2 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 13.23 μg/m3
PM10: 14.91 μg/m3
Carbon Monoxide: 177.81 μg/m3
Nitrogen Dioxide: 15.14 μg/m3
Sulphur Dioxide: 3.53 μg/m3
Ozone: 50.28 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
77.2°F
53.8°F
63.4°F
49%
0 in
0%
0%
10.1 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 13.12 μg/m3
PM10: 14.29 μg/m3
Carbon Monoxide: 215.69 μg/m3
Nitrogen Dioxide: 9.31 μg/m3
Sulphur Dioxide: 3.03 μg/m3
Ozone: 63.24 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
66.5°F
53°F
60.1°F
43%
0 in
0%
0%
16.1 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 5.31 μg/m3
PM10: 5.36 μg/m3
Carbon Monoxide: 156.53 μg/m3
Nitrogen Dioxide: 7.18 μg/m3
Sulphur Dioxide: 2.44 μg/m3
Ozone: 66.2 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
72.1°F
52.1°F
59.8°F
65%
0 in
0%
0%
18.6 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 5.15 μg/m3
PM10: 5.15 μg/m3
Carbon Monoxide: 163.85 μg/m3
Nitrogen Dioxide: 12.75 μg/m3
Sulphur Dioxide: 2.25 μg/m3
Ozone: 68 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

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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