Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

85.3°F

Measurement Time: Thursday, May 21, 2026, 1:00 AM 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

75.7°F
Sunny
Sunny
80°F
80°F
90%
SE 6.3 mph
12.1 mph
75.7°F
71.8°F
0 in
20%
6 mi
1012 mbar
6

Five Day Weather Forecast

Patchy rain nearby
Thu
H: 90°F
L: 74°F
Sunny
Fri
H: 96°F
L: 73°F
Heavy rain
Sat
H: 99°F
L: 73°F
Moderate rain
Sun
H: 90°F
L: 71°F
Patchy rain nearby
Mon
H: 94°F
L: 74°F

Air Quality

AQI: 1 - Good
PM2.5: 12.15 μg/m3
PM10: 16.25 μg/m3
Carbon Monoxide: 151.85 μg/m3
Nitrogen Dioxide: 2.45 μg/m3
Sulphur Dioxide: 2.35 μg/m3
Ozone: 80 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 1:28 PM
Sunset: 8:14 PM
Daylight: 13 hrs 31 mins
Moonrise: 11:37 AM
Moon Transit: 6:33 PM
Moonset: 12:41 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

4:31 AM - 7:01 AM
6:03 PM - 8:33 PM

Minor Periods

11:07 AM - 12:37 AM
12:11 AM - 1:41 AM

Action Rating: 4 out of 5

Special Weather Statement issued May 21 at 6:54AM CDT by NWS Brownsville TX

Effective: Thu May 21, 2026, 6:54 AM
Expires: Thu May 21, 2026, 7:45 AM

At 654 AM CDT, Doppler radar was tracking a strong thunderstorm near Santa Catarina, or 12 miles northwest of Mccook, moving northeast at 30 mph. HAZARD...Wind gusts up to 40 mph and half inch hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... San Isidro, Puerto Rico, and Delmita.

If outdoors, consider seeking shelter inside a building. Torrential rainfall is also occurring with this storm and may lead to localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle.
Thursday, May 21, 2026

Weather Forecast

Patchy rain nearby
89.5°F
74.3°F
80.1°F
80%
0.1 in
89%
0%
18.3 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 10.23 μg/m3
PM10: 13.85 μg/m3
Carbon Monoxide: 141.57 μg/m3
Nitrogen Dioxide: 5.53 μg/m3
Sulphur Dioxide: 2.11 μg/m3
Ozone: 53.96 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 1:28 PM
Sunset: 8:14 PM
Daylight: 13 hrs 31 mins
Moonrise: 11:37 AM
Moon Transit: 6:33 PM
Moonset: 12:41 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

4:31 AM - 7:01 AM
6:03 PM - 8:33 PM

Minor Periods

11:07 AM - 12:37 AM
12:11 AM - 1:41 AM

Action Rating: 4 out of 5

Friday, May 22, 2026

Weather Forecast

Sunny
96.1°F
72.7°F
83.1°F
67%
0 in
0%
0%
15.9 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 10.21 μg/m3
PM10: 13.6 μg/m3
Carbon Monoxide: 146.41 μg/m3
Nitrogen Dioxide: 5.04 μg/m3
Sulphur Dioxide: 2 μg/m3
Ozone: 57.64 μg/m3

Astronomical

Sunrise: 6:42 AM
Sun Transit: 1:28 PM
Sunset: 8:15 PM
Daylight: 13 hrs 32 mins
Moonrise: 12:42 AM
Moon Transit: 7:24 PM
Moonset: 1:23 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

5:24 AM - 7:54 AM
6:54 PM - 9:24 PM

Minor Periods

12:12 AM - 1:42 PM
12:53 AM - 2:23 AM

Action Rating: 2 out of 5

Saturday, May 23, 2026

Weather Forecast

Heavy rain
98.6°F
73°F
84.3°F
70%
1.16 in
75%
0%
16.6 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 10.29 μg/m3
PM10: 12.85 μg/m3
Carbon Monoxide: 161.77 μg/m3
Nitrogen Dioxide: 4.28 μg/m3
Sulphur Dioxide: 1.83 μg/m3
Ozone: 66.2 μg/m3

Astronomical

Sunrise: 6:42 AM
Sun Transit: 1:28 PM
Sunset: 8:15 PM
Daylight: 13 hrs 33 mins
Moonrise: 1:41 PM
Moon Transit: 8:10 PM
Moonset: 2:00 AM
Moon Phase: First Quarter
Moon Illumination: 44.4%

Best Times for Fishing or Hunting

Major Periods

6:12 AM - 8:42 AM
7:40 PM - 10:10 PM

Minor Periods

1:11 PM - 2:41 PM
1:30 AM - 3:00 AM

Action Rating: 2 out of 5

Sunday, May 24, 2026

Weather Forecast

Moderate rain
90.2°F
71°F
79°F
76%
0.52 in
88%
0%
14.5 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 7.89 μg/m3
PM10: 9.31 μg/m3
Carbon Monoxide: 166.21 μg/m3
Nitrogen Dioxide: 7.36 μg/m3
Sulphur Dioxide: 2.05 μg/m3
Ozone: 60.56 μg/m3

Astronomical

Sunrise: 6:42 AM
Sun Transit: 1:28 PM
Sunset: 8:16 PM
Daylight: 13 hrs 34 mins
Moonrise: 2:38 PM
Moon Transit: 8:53 PM
Moonset: 2:33 AM
Moon Phase: First Quarter
Moon Illumination: 55.7%

Best Times for Fishing or Hunting

Major Periods

6:57 AM - 9:27 AM
8:23 PM - 10:53 PM

Minor Periods

2:08 PM - 3:38 PM
2:03 AM - 3:33 AM

Action Rating: 4 out of 5

Monday, May 25, 2026

Weather Forecast

Patchy rain nearby
94.4°F
74.1°F
80.6°F
75%
0.04 in
83%
0%
13.9 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 5.67 μg/m3
PM10: 6.39 μg/m3
Carbon Monoxide: 176.63 μg/m3
Nitrogen Dioxide: 9.88 μg/m3
Sulphur Dioxide: 2.41 μg/m3
Ozone: 51.62 μg/m3

Astronomical

Sunrise: 6:41 AM
Sun Transit: 1:28 PM
Sunset: 8:16 PM
Daylight: 13 hrs 35 mins
Moonrise: 3:33 PM
Moon Transit: 9:35 PM
Moonset: 3:03 AM
Moon Phase: First Quarter
Moon Illumination: 66.7%

Best Times for Fishing or Hunting

Major Periods

7:39 AM - 10:09 AM
9:05 PM - 11:35 PM

Minor Periods

3:03 PM - 4:33 PM
2:33 AM - 4:03 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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