Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

78.3°F

Measurement Time: Wednesday, March 25, 2026, 5:00 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

72°F
Clear
Clear
76.3°F
77.2°F
82%
SE 12.8 mph
19.5 mph
73.1°F
64.3°F
0 in
25%
9 mi
1017 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 91°F
L: 66°F
Partly Cloudy
Thu
H: 86°F
L: 69°F
Overcast
Fri
H: 89°F
L: 68°F
Cloudy
Sat
H: 79°F
L: 66°F
Patchy rain nearby
Sun
H: 88°F
L: 66°F

Air Quality

AQI: 1 - Good
PM2.5: 6.95 μg/m3
PM10: 9.25 μg/m3
Carbon Monoxide: 133.85 μg/m3
Nitrogen Dioxide: 3.75 μg/m3
Sulphur Dioxide: 1.75 μg/m3
Ozone: 71 μg/m3

Astronomical

Sunrise: 7:30 AM
Sun Transit: 12:00 AM
Sunset: 7:45 PM
Daylight: 12 hrs 15 mins
Moonrise: 12:38 AM
Moon Transit: 7:55 PM
Moonset: 2:12 AM
Moon Phase: First Quarter
Moon Illumination: 45.1%

Best Times for Fishing or Hunting

Major Periods

5:48 AM - 8:18 AM
7:25 PM - 9:55 PM

Minor Periods

12:08 AM - 1:38 PM
1:42 AM - 3:12 AM

Action Rating: 3 out of 5

Wednesday, March 25, 2026

Weather Forecast

Sunny
90.5°F
65.8°F
76.4°F
71%
0 in
0%
0%
19 mph
2.3


Air Quality

AQI: 1 - Good
PM2.5: 6.73 μg/m3
PM10: 8.65 μg/m3
Carbon Monoxide: 146.49 μg/m3
Nitrogen Dioxide: 3.89 μg/m3
Sulphur Dioxide: 1.76 μg/m3
Ozone: 79.84 μg/m3

Astronomical

Sunrise: 7:30 AM
Sun Transit: 12:00 AM
Sunset: 7:45 PM
Daylight: 12 hrs 15 mins
Moonrise: 12:38 AM
Moon Transit: 7:55 PM
Moonset: 2:12 AM
Moon Phase: First Quarter
Moon Illumination: 45.1%

Best Times for Fishing or Hunting

Major Periods

5:48 AM - 8:18 AM
7:25 PM - 9:55 PM

Minor Periods

12:08 AM - 1:38 PM
1:42 AM - 3:12 AM

Action Rating: 3 out of 5

Thursday, March 26, 2026

Weather Forecast

Partly Cloudy
86°F
69.4°F
75.8°F
69%
0 in
0%
0%
19 mph
2.3


Air Quality

AQI: 1 - Good
PM2.5: 6.98 μg/m3
PM10: 9.17 μg/m3
Carbon Monoxide: 138.65 μg/m3
Nitrogen Dioxide: 3.41 μg/m3
Sulphur Dioxide: 1.68 μg/m3
Ozone: 79.08 μg/m3

Astronomical

Sunrise: 7:29 AM
Sun Transit: 12:00 AM
Sunset: 7:46 PM
Daylight: 12 hrs 17 mins
Moonrise: 1:44 PM
Moon Transit: 8:55 PM
Moonset: 3:11 AM
Moon Phase: First Quarter
Moon Illumination: 56.4%

Best Times for Fishing or Hunting

Major Periods

6:50 AM - 9:20 AM
8:25 PM - 10:55 PM

Minor Periods

1:14 PM - 2:44 PM
2:41 AM - 4:11 AM

Action Rating: 2 out of 5

Friday, March 27, 2026

Weather Forecast

Overcast
88.5°F
67.6°F
74.9°F
69%
0 in
0%
0%
17.4 mph
2.3


Air Quality

AQI: 1 - Good
PM2.5: 7.31 μg/m3
PM10: 9.65 μg/m3
Carbon Monoxide: 135.93 μg/m3
Nitrogen Dioxide: 3.36 μg/m3
Sulphur Dioxide: 1.7 μg/m3
Ozone: 80.92 μg/m3

Astronomical

Sunrise: 7:28 AM
Sun Transit: 12:00 AM
Sunset: 7:46 PM
Daylight: 12 hrs 18 mins
Moonrise: 2:50 PM
Moon Transit: 9:50 PM
Moonset: 4:02 AM
Moon Phase: First Quarter
Moon Illumination: 67.4%

Best Times for Fishing or Hunting

Major Periods

7:47 AM - 10:17 AM
9:20 PM - 11:50 PM

Minor Periods

2:20 PM - 3:50 PM
3:32 AM - 5:02 AM

Action Rating: 3 out of 5

Saturday, March 28, 2026

Weather Forecast

Cloudy
78.8°F
65.5°F
71.5°F
72%
0 in
0%
0%
15.7 mph
2.3


Air Quality

AQI: 1 - Good
PM2.5: 9.97 μg/m3
PM10: 13.12 μg/m3
Carbon Monoxide: 137.94 μg/m3
Nitrogen Dioxide: 7.66 μg/m3
Sulphur Dioxide: 1.86 μg/m3
Ozone: 73.32 μg/m3

Astronomical

Sunrise: 7:27 AM
Sun Transit: 12:00 AM
Sunset: 7:47 PM
Daylight: 12 hrs 20 mins
Moonrise: 3:53 PM
Moon Transit: 10:41 PM
Moonset: 4:45 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 77.5%

Best Times for Fishing or Hunting

Major Periods

8:41 AM - 11:11 AM
12:00 AM - 12:00 AM

Minor Periods

3:23 PM - 4:53 PM
4:15 AM - 5:45 AM

Action Rating: 2 out of 5

Sunday, March 29, 2026

Weather Forecast

Patchy rain nearby
87.8°F
66°F
74.5°F
71%
0.01 in
87%
0%
18.6 mph
2.3


Air Quality

AQI: 1 - Good
PM2.5: 10.67 μg/m3
PM10: 13.87 μg/m3
Carbon Monoxide: 169.4 μg/m3
Nitrogen Dioxide: 7.96 μg/m3
Sulphur Dioxide: 1.88 μg/m3
Ozone: 73.92 μg/m3

Astronomical

Sunrise: 7:26 AM
Sun Transit: 12:00 AM
Sunset: 7:47 PM
Daylight: 12 hrs 22 mins
Moonrise: 4:54 PM
Moon Transit: 11:28 PM
Moonset: 5:23 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.2%

Best Times for Fishing or Hunting

Major Periods

9:30 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

4:24 PM - 5:54 PM
4:53 AM - 6:23 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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