Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

87.4°F

Measurement Time: Saturday, July 11, 2026, 8:00 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

79°F
Clear
Clear
84.4°F
88.6°F
94%
SSE 10.7 mph
16.4 mph
81.1°F
75.9°F
0 in
0%
9 mi
1016 mbar
0

Five Day Weather Forecast

Sunny
Sun
H: 99°F
L: 78°F
Sunny
Mon
H: 100°F
L: 77°F
Sunny
Tue
H: 98°F
L: 76°F
Sunny
Wed
H: 97°F
L: 78°F
Sunny
Thu
H: 97°F
L: 77°F

Air Quality

AQI: 1 - Good
PM2.5: 9.7 μg/m3
PM10: 14.6 μg/m3
Carbon Monoxide: 119 μg/m3
Nitrogen Dioxide: 4.1 μg/m3
Sulphur Dioxide: 1.1 μg/m3
Ozone: 42 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 1:37 PM
Sunset: 8:27 PM
Daylight: 13 hrs 39 mins
Moonrise: 4:34 AM
Moon Transit: 11:52 AM
Moonset: 7:11 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:22 AM - 1:52 PM

Minor Periods

6:41 PM - 8:11 PM
4:04 AM - 5:34 AM

Action Rating: 3 out of 5

Sunday, July 12, 2026

Weather Forecast

Sunny
99°F
78.4°F
87.1°F
66%
0 in
6%
0%
18.8 mph
11.5


Air Quality

AQI: 1 - Good
PM2.5: 6.15 μg/m3
PM10: 9.27 μg/m3
Carbon Monoxide: 110.67 μg/m3
Nitrogen Dioxide: 3.2 μg/m3
Sulphur Dioxide: 0.91 μg/m3
Ozone: 52.75 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 1:37 PM
Sunset: 8:27 PM
Daylight: 13 hrs 39 mins
Moonrise: 4:34 AM
Moon Transit: 11:52 AM
Moonset: 7:11 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:22 AM - 1:52 PM

Minor Periods

6:41 PM - 8:11 PM
4:04 AM - 5:34 AM

Action Rating: 3 out of 5

Monday, July 13, 2026

Weather Forecast

Sunny
99.5°F
76.6°F
87.4°F
63%
0 in
4%
0%
19.7 mph
12


Air Quality

AQI: 1 - Good
PM2.5: 10.49 μg/m3
PM10: 19.37 μg/m3
Carbon Monoxide: 114.54 μg/m3
Nitrogen Dioxide: 3.72 μg/m3
Sulphur Dioxide: 1.04 μg/m3
Ozone: 50.67 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 1:37 PM
Sunset: 8:27 PM
Daylight: 13 hrs 38 mins
Moonrise: 5:42 AM
Moon Transit: 1:00 PM
Moonset: 8:12 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:30 AM - 3:00 PM

Minor Periods

7:42 PM - 9:12 PM
5:12 AM - 6:42 AM

Action Rating: 4 out of 5

Tuesday, July 14, 2026

Weather Forecast

Sunny
98.4°F
75.7°F
86.3°F
63%
0 in
4%
0%
18.3 mph
11.8


Air Quality

AQI: 2 - Moderate
PM2.5: 21.71 μg/m3
PM10: 37.99 μg/m3
Carbon Monoxide: 112.88 μg/m3
Nitrogen Dioxide: 3.34 μg/m3
Sulphur Dioxide: 1.18 μg/m3
Ozone: 52.33 μg/m3

Astronomical

Sunrise: 6:49 AM
Sun Transit: 1:37 PM
Sunset: 8:26 PM
Daylight: 13 hrs 38 mins
Moonrise: 6:54 AM
Moon Transit: 2:02 PM
Moonset: 9:05 PM
Moon Phase: New
Moon Illumination: 1.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:32 PM - 4:02 PM

Minor Periods

8:35 PM - 10:05 PM
6:24 AM - 7:54 AM

Action Rating: 5 out of 5

Wednesday, July 15, 2026

Weather Forecast

Sunny
97.1°F
77.9°F
86°F
64%
0.1 in
57%
0%
18.6 mph
10.8


Air Quality

AQI: 1 - Good
PM2.5: 12.95 μg/m3
PM10: 20.18 μg/m3
Carbon Monoxide: 104.5 μg/m3
Nitrogen Dioxide: 3.39 μg/m3
Sulphur Dioxide: 1 μg/m3
Ozone: 52.75 μg/m3

Astronomical

Sunrise: 6:49 AM
Sun Transit: 1:37 PM
Sunset: 8:26 PM
Daylight: 13 hrs 37 mins
Moonrise: 8:05 AM
Moon Transit: 3:01 PM
Moonset: 9:49 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:56 AM - 3:26 AM
2:31 PM - 5:01 PM

Minor Periods

9:19 PM - 10:49 PM
7:35 AM - 9:05 AM

Action Rating: 3 out of 5

Thursday, July 16, 2026

Weather Forecast

Sunny
96.8°F
77.3°F
86.3°F
62%
0.01 in
17%
0%
19.9 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 9.41 μg/m3
PM10: 13.55 μg/m3
Carbon Monoxide: 128 μg/m3
Nitrogen Dioxide: 4.86 μg/m3
Sulphur Dioxide: 1.13 μg/m3
Ozone: 47.63 μg/m3

Astronomical

Sunrise: 6:50 AM
Sun Transit: 1:37 PM
Sunset: 8:26 PM
Daylight: 13 hrs 36 mins
Moonrise: 9:13 AM
Moon Transit: 3:54 PM
Moonset: 10:28 PM
Moon Phase: New
Moon Illumination: 2.4%

Best Times for Fishing or Hunting

Major Periods

1:52 AM - 4:22 AM
3:24 PM - 5:54 PM

Minor Periods

9:58 PM - 11:28 PM
8:43 AM - 10:13 AM

Action Rating: 3 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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