Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

32.0°F

Measurement Time: Saturday, July 18, 2026, 8:43 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

81°F
Clear
Clear
88.2°F
87.8°F
88%
SSE 14.8 mph
21.9 mph
80.8°F
75.6°F
0 in
0%
9 mi
1016 mbar
0

Five Day Weather Forecast

Sunny
Sun
H: 100°F
L: 79°F
Sunny
Mon
H: 101°F
L: 75°F
Sunny
Tue
H: 101°F
L: 76°F
Sunny
Wed
H: 102°F
L: 78°F
Sunny
Thu
H: 103°F
L: 76°F

Air Quality

AQI: 1 - Good
PM2.5: 10.7 μg/m3
PM10: 17.8 μg/m3
Carbon Monoxide: 99 μg/m3
Nitrogen Dioxide: 3.4 μg/m3
Sulphur Dioxide: 1 μg/m3
Ozone: 46 μg/m3

Astronomical

Sunrise: 6:51 AM
Sun Transit: 1:37 PM
Sunset: 8:25 PM
Daylight: 13 hrs 34 mins
Moonrise: 12:13 AM
Moon Transit: 6:11 PM
Moonset: 12:33 AM
Moon Phase: Waxing Crescent
Moon Illumination: 22.6%

Best Times for Fishing or Hunting

Major Periods

4:14 AM - 6:44 AM
5:41 PM - 8:11 PM

Minor Periods

11:43 AM - 1:13 PM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Sunday, July 19, 2026

Weather Forecast

Sunny
100°F
78.6°F
87.4°F
64%
0 in
4%
0%
20.1 mph
11.5


Air Quality

AQI: 1 - Good
PM2.5: 14.78 μg/m3
PM10: 26.06 μg/m3
Carbon Monoxide: 99.67 μg/m3
Nitrogen Dioxide: 2.28 μg/m3
Sulphur Dioxide: 0.93 μg/m3
Ozone: 55.75 μg/m3

Astronomical

Sunrise: 6:51 AM
Sun Transit: 1:37 PM
Sunset: 8:25 PM
Daylight: 13 hrs 34 mins
Moonrise: 12:13 AM
Moon Transit: 6:11 PM
Moonset: 12:33 AM
Moon Phase: Waxing Crescent
Moon Illumination: 22.6%

Best Times for Fishing or Hunting

Major Periods

4:14 AM - 6:44 AM
5:41 PM - 8:11 PM

Minor Periods

11:43 AM - 1:13 PM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Monday, July 20, 2026

Weather Forecast

Sunny
101.3°F
74.8°F
86.8°F
59%
0 in
3%
0%
19 mph
11.6


Air Quality

AQI: 1 - Good
PM2.5: 13.65 μg/m3
PM10: 21.68 μg/m3
Carbon Monoxide: 98.5 μg/m3
Nitrogen Dioxide: 2.43 μg/m3
Sulphur Dioxide: 0.84 μg/m3
Ozone: 52.21 μg/m3

Astronomical

Sunrise: 6:52 AM
Sun Transit: 1:38 PM
Sunset: 8:24 PM
Daylight: 13 hrs 33 mins
Moonrise: 1:08 PM
Moon Transit: 6:54 PM
Moonset: 12:05 AM
Moon Phase: Waxing Crescent
Moon Illumination: 32.7%

Best Times for Fishing or Hunting

Major Periods

4:58 AM - 7:28 AM
6:24 PM - 8:54 PM

Minor Periods

12:38 AM - 2:08 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Tuesday, July 21, 2026

Weather Forecast

Sunny
100.5°F
76°F
86.6°F
64%
0 in
5%
0%
18.6 mph
10.9


Air Quality

AQI: 2 - Moderate
PM2.5: 16.4 μg/m3
PM10: 24.9 μg/m3
Carbon Monoxide: 101.21 μg/m3
Nitrogen Dioxide: 2.85 μg/m3
Sulphur Dioxide: 0.91 μg/m3
Ozone: 49.83 μg/m3

Astronomical

Sunrise: 6:52 AM
Sun Transit: 1:38 PM
Sunset: 8:24 PM
Daylight: 13 hrs 32 mins
Moonrise: 2:04 PM
Moon Transit: 7:39 PM
Moonset: 12:37 AM
Moon Phase: First Quarter
Moon Illumination: 43.7%

Best Times for Fishing or Hunting

Major Periods

5:41 AM - 8:11 AM
7:09 PM - 9:39 PM

Minor Periods

1:34 PM - 3:04 PM
12:07 AM - 1:37 AM

Action Rating: 2 out of 5

Wednesday, July 22, 2026

Weather Forecast

Sunny
101.5°F
77.8°F
87.9°F
61%
0 in
4%
0%
18.8 mph
11.4


Air Quality

AQI: 2 - Moderate
PM2.5: 15.84 μg/m3
PM10: 24.13 μg/m3
Carbon Monoxide: 111.53 μg/m3
Nitrogen Dioxide: 3.09 μg/m3
Sulphur Dioxide: 1.06 μg/m3
Ozone: 48.63 μg/m3

Astronomical

Sunrise: 6:53 AM
Sun Transit: 1:38 PM
Sunset: 8:24 PM
Daylight: 13 hrs 31 mins
Moonrise: 2:59 PM
Moon Transit: 8:24 PM
Moonset: 1:10 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

6:26 AM - 8:56 AM
7:54 PM - 10:24 PM

Minor Periods

2:29 PM - 3:59 PM
12:40 AM - 2:10 AM

Action Rating: 4 out of 5

Thursday, July 23, 2026

Weather Forecast

Sunny
102.6°F
76°F
87.9°F
61%
0 in
3%
0%
17.9 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 14.85 μg/m3
PM10: 21.36 μg/m3
Carbon Monoxide: 149.63 μg/m3
Nitrogen Dioxide: 4.78 μg/m3
Sulphur Dioxide: 1.26 μg/m3
Ozone: 41.13 μg/m3

Astronomical

Sunrise: 6:53 AM
Sun Transit: 1:38 PM
Sunset: 8:23 PM
Daylight: 13 hrs 30 mins
Moonrise: 3:55 PM
Moon Transit: 9:12 PM
Moonset: 1:47 AM
Moon Phase: First Quarter
Moon Illumination: 66.1%

Best Times for Fishing or Hunting

Major Periods

7:13 AM - 9:43 AM
8:42 PM - 11:12 PM

Minor Periods

3:25 PM - 4:55 PM
1:17 AM - 2:47 AM

Action Rating: 4 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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