Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

75.9°F

Measurement Time: Thursday, March 5, 2026, 6:00 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

87.1°F
Sunny
Sunny
91.8°F
85.8°F
46%
SSE 22.1 mph
25.5 mph
83.1°F
65.6°F
0 in
25%
9 mi
1013 mbar
7

Five Day Weather Forecast

Cloudy
Thu
H: 89°F
L: 73°F
Overcast
Fri
H: 87°F
L: 71°F
Overcast
Sat
H: 87°F
L: 73°F
Overcast
Sun
H: 91°F
L: 71°F
Patchy rain nearby
Mon
H: 89°F
L: 74°F

Air Quality

AQI: 1 - Good
PM2.5: 6.65 μg/m3
PM10: 8.45 μg/m3
Carbon Monoxide: 120.85 μg/m3
Nitrogen Dioxide: 3.35 μg/m3
Sulphur Dioxide: 1.55 μg/m3
Ozone: 64 μg/m3

Astronomical

Sunrise: 6:51 AM
Sun Transit: 12:43 AM
Sunset: 6:36 PM
Daylight: 11 hrs 45 mins
Moonrise: 8:54 PM
Moon Transit: 2:01 AM
Moonset: 7:58 AM
Moon Phase: Full
Moon Illumination: 94.0%

Best Times for Fishing or Hunting

Major Periods

1:31 AM - 4:01 AM
12:47 AM - 3:17 PM

Minor Periods

8:24 PM - 9:54 PM
7:28 AM - 8:58 AM

Action Rating: 3 out of 5

Thursday, March 5, 2026

Weather Forecast

Cloudy
88.5°F
72.5°F
78.2°F
70%
0 in
0%
0%
22.6 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 8.55 μg/m3
PM10: 10.57 μg/m3
Carbon Monoxide: 121.17 μg/m3
Nitrogen Dioxide: 3.06 μg/m3
Sulphur Dioxide: 1.69 μg/m3
Ozone: 66.24 μg/m3

Astronomical

Sunrise: 6:51 AM
Sun Transit: 12:43 AM
Sunset: 6:36 PM
Daylight: 11 hrs 45 mins
Moonrise: 8:54 PM
Moon Transit: 2:01 AM
Moonset: 7:58 AM
Moon Phase: Full
Moon Illumination: 94.0%

Best Times for Fishing or Hunting

Major Periods

1:31 AM - 4:01 AM
12:47 AM - 3:17 PM

Minor Periods

8:24 PM - 9:54 PM
7:28 AM - 8:58 AM

Action Rating: 3 out of 5

Friday, March 6, 2026

Weather Forecast

Overcast
86.5°F
71.4°F
76.3°F
80%
0 in
0%
0%
22.4 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 6.75 μg/m3
PM10: 8.34 μg/m3
Carbon Monoxide: 116.57 μg/m3
Nitrogen Dioxide: 3.04 μg/m3
Sulphur Dioxide: 1.62 μg/m3
Ozone: 63.84 μg/m3

Astronomical

Sunrise: 6:50 AM
Sun Transit: 12:42 AM
Sunset: 6:36 PM
Daylight: 11 hrs 46 mins
Moonrise: 9:48 PM
Moon Transit: 2:43 AM
Moonset: 8:29 AM
Moon Phase: Waning Gibbous
Moon Illumination: 87.6%

Best Times for Fishing or Hunting

Major Periods

2:13 AM - 4:43 AM
1:30 PM - 4:00 PM

Minor Periods

9:18 PM - 10:48 PM
7:59 AM - 9:29 AM

Action Rating: 2 out of 5

Saturday, March 7, 2026

Weather Forecast

Overcast
87.4°F
72.5°F
76.6°F
80%
0 in
0%
0%
22.4 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 7.5 μg/m3
PM10: 9.25 μg/m3
Carbon Monoxide: 119.45 μg/m3
Nitrogen Dioxide: 3.15 μg/m3
Sulphur Dioxide: 1.6 μg/m3
Ozone: 64.6 μg/m3

Astronomical

Sunrise: 6:49 AM
Sun Transit: 12:42 AM
Sunset: 6:37 PM
Daylight: 11 hrs 48 mins
Moonrise: 10:44 PM
Moon Transit: 3:27 AM
Moonset: 9:01 AM
Moon Phase: Waning Gibbous
Moon Illumination: 79.2%

Best Times for Fishing or Hunting

Major Periods

2:57 AM - 5:27 AM
2:14 PM - 4:44 PM

Minor Periods

10:14 PM - 11:44 PM
8:31 AM - 10:01 AM

Action Rating: 2 out of 5

Sunday, March 8, 2026

Weather Forecast

Overcast
90.7°F
71.2°F
78.2°F
72%
0 in
0%
0%
15 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 6.35 μg/m3
PM10: 8.02 μg/m3
Carbon Monoxide: 125.51 μg/m3
Nitrogen Dioxide: 3.79 μg/m3
Sulphur Dioxide: 1.73 μg/m3
Ozone: 59.2 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 12:42 AM
Sunset: 6:37 PM
Daylight: 11 hrs 49 mins
Moonrise: 11:40 PM
Moon Transit: 4:12 AM
Moonset: 9:36 AM
Moon Phase: Waning Gibbous
Moon Illumination: 69.3%

Best Times for Fishing or Hunting

Major Periods

3:42 AM - 6:12 AM
3:00 PM - 5:30 PM

Minor Periods

12:00 AM - 12:00 AM
9:06 AM - 10:36 AM

Action Rating: 2 out of 5

Monday, March 9, 2026

Weather Forecast

Patchy rain nearby
89°F
73.5°F
79.1°F
68%
0.01 in
83%
0%
21.5 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 7.83 μg/m3
PM10: 9.85 μg/m3
Carbon Monoxide: 146.83 μg/m3
Nitrogen Dioxide: 4.81 μg/m3
Sulphur Dioxide: 1.92 μg/m3
Ozone: 53.83 μg/m3

Astronomical

Sunrise: 6:47 AM
Sun Transit: 12:42 AM
Sunset: 6:38 PM
Daylight: 11 hrs 51 mins
Moonrise: 12:40 AM
Moon Transit: 5:00 AM
Moonset: 10:16 AM
Moon Phase: Waning Gibbous
Moon Illumination: 58.5%

Best Times for Fishing or Hunting

Major Periods

4:30 AM - 7:00 AM
3:48 PM - 6:18 PM

Minor Periods

9:46 AM - 11:16 AM
12:00 AM - 12:00 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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