Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

73.2°F

Measurement Time: Thursday, February 19, 2026, 2:00 AM 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

73°F
Mist
Mist
77.1°F
73.5°F
81%
SSE 15 mph
20.8 mph
70.5°F
66.3°F
0 in
100%
3 mi
1004 mbar
0.5

Five Day Weather Forecast

Sunny
Thu
H: 99°F
L: 70°F
Overcast
Fri
H: 77°F
L: 69°F
Overcast
Sat
H: 78°F
L: 69°F
Sunny
Sun
H: 69°F
L: 58°F
Partly Cloudy
Mon
H: 72°F
L: 55°F

Air Quality

AQI: 1 - Good
PM2.5: 14.85 μg/m3
PM10: 15.95 μg/m3
Carbon Monoxide: 161.85 μg/m3
Nitrogen Dioxide: 2.55 μg/m3
Sulphur Dioxide: 3.15 μg/m3
Ozone: 123 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 12:45 AM
Sunset: 6:28 PM
Daylight: 11 hrs 24 mins
Moonrise: 8:20 AM
Moon Transit: 3:07 PM
Moonset: 8:50 PM
Moon Phase: Waxing Crescent
Moon Illumination: 5.2%

Best Times for Fishing or Hunting

Major Periods

2:37 PM - 5:07 PM
2:37 PM - 5:07 PM

Minor Periods

8:20 PM - 9:50 PM
7:50 AM - 9:20 AM

Action Rating: 2 out of 5

Thursday, February 19, 2026

Weather Forecast

Sunny
99.1°F
69.6°F
80°F
66%
0 in
0%
0%
17.9 mph
1.5


Air Quality

AQI: 2 - Moderate
PM2.5: 15.56 μg/m3
PM10: 16.85 μg/m3
Carbon Monoxide: 159.33 μg/m3
Nitrogen Dioxide: 3.34 μg/m3
Sulphur Dioxide: 2.24 μg/m3
Ozone: 89.76 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 12:45 AM
Sunset: 6:28 PM
Daylight: 11 hrs 24 mins
Moonrise: 8:20 AM
Moon Transit: 3:07 PM
Moonset: 8:50 PM
Moon Phase: Waxing Crescent
Moon Illumination: 5.2%

Best Times for Fishing or Hunting

Major Periods

2:37 PM - 5:07 PM
2:37 PM - 5:07 PM

Minor Periods

8:20 PM - 9:50 PM
7:50 AM - 9:20 AM

Action Rating: 2 out of 5

Friday, February 20, 2026

Weather Forecast

Overcast
77°F
69.1°F
72.2°F
88%
0 in
0%
0%
14.5 mph
1.7


Air Quality

AQI: 2 - Moderate
PM2.5: 17.26 μg/m3
PM10: 18.57 μg/m3
Carbon Monoxide: 168.53 μg/m3
Nitrogen Dioxide: 4.06 μg/m3
Sulphur Dioxide: 2.37 μg/m3
Ozone: 100.04 μg/m3

Astronomical

Sunrise: 7:03 AM
Sun Transit: 12:45 AM
Sunset: 6:28 PM
Daylight: 11 hrs 25 mins
Moonrise: 8:53 AM
Moon Transit: 3:17 PM
Moonset: 9:50 PM
Moon Phase: Waxing Crescent
Moon Illumination: 11.3%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:47 PM - 5:17 PM

Minor Periods

9:20 PM - 10:50 PM
8:23 AM - 9:53 AM

Action Rating: 2 out of 5

Saturday, February 21, 2026

Weather Forecast

Overcast
78.1°F
68.9°F
72.6°F
83%
0 in
0%
0%
20.8 mph
1.7


Air Quality

AQI: 1 - Good
PM2.5: 14.75 μg/m3
PM10: 16.96 μg/m3
Carbon Monoxide: 156.73 μg/m3
Nitrogen Dioxide: 4.47 μg/m3
Sulphur Dioxide: 2.32 μg/m3
Ozone: 82.92 μg/m3

Astronomical

Sunrise: 7:02 AM
Sun Transit: 12:45 AM
Sunset: 6:29 PM
Daylight: 11 hrs 27 mins
Moonrise: 9:27 AM
Moon Transit: 4:06 PM
Moonset: 10:54 PM
Moon Phase: Waxing Crescent
Moon Illumination: 19.4%

Best Times for Fishing or Hunting

Major Periods

2:06 AM - 4:36 AM
3:36 PM - 6:06 PM

Minor Periods

10:24 PM - 11:54 PM
8:57 AM - 10:27 AM

Action Rating: 3 out of 5

Sunday, February 22, 2026

Weather Forecast

Sunny
69.2°F
57.7°F
62.8°F
56%
0 in
0%
0%
19.5 mph
1.6


Air Quality

AQI: 1 - Good
PM2.5: 6.06 μg/m3
PM10: 6.62 μg/m3
Carbon Monoxide: 162.92 μg/m3
Nitrogen Dioxide: 4.05 μg/m3
Sulphur Dioxide: 2.49 μg/m3
Ozone: 93.08 μg/m3

Astronomical

Sunrise: 7:01 AM
Sun Transit: 12:45 AM
Sunset: 6:29 PM
Daylight: 11 hrs 28 mins
Moonrise: 10:06 AM
Moon Transit: 5:00 PM
Moonset: 12:00 PM
Moon Phase: Waxing Crescent
Moon Illumination: 29.1%

Best Times for Fishing or Hunting

Major Periods

2:57 AM - 5:27 AM
4:30 PM - 7:00 PM

Minor Periods

12:00 AM - 12:00 AM
9:36 AM - 11:06 AM

Action Rating: 2 out of 5

Monday, February 23, 2026

Weather Forecast

Partly Cloudy
71.9°F
54.7°F
62.1°F
53%
0 in
0%
0%
15.7 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 6.74 μg/m3
PM10: 7.79 μg/m3
Carbon Monoxide: 190 μg/m3
Nitrogen Dioxide: 7.59 μg/m3
Sulphur Dioxide: 3.73 μg/m3
Ozone: 86.15 μg/m3

Astronomical

Sunrise: 7:00 AM
Sun Transit: 12:44 AM
Sunset: 6:30 PM
Daylight: 11 hrs 30 mins
Moonrise: 10:50 AM
Moon Transit: 5:55 PM
Moonset: 1:00 AM
Moon Phase: First Quarter
Moon Illumination: 39.8%

Best Times for Fishing or Hunting

Major Periods

3:51 AM - 6:21 AM
5:25 PM - 7:55 PM

Minor Periods

10:20 AM - 11:50 AM
12:00 AM - 12:00 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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