Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

70.3°F

Measurement Time: Sunday, November 30, 2025, 9:00 PM CST

Temperature Locations

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Local Points of Interest

Mercedes Settling Basin; Matamoros Municipality, Mexico

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Rio Grande

Station Name: Rio Grande nr Mercedes, TX
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 75 feet / 23 meters

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

51.1°F
Overcast
Conditions: Overcast
Humidity: 79%
Feels Like: 46°F
Wind: NNW 15 mph
Wind Gusts: 19.8 mph
Pressure: 30.12 in
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Overcast
Mon
H: 52°F
L: 47°F
Overcast
Tue
H: 56°F
L: 48°F
Overcast
Wed
H: 75°F
L: 51°F
Moderate rain
Thu
H: 84°F
L: 62°F
Patchy rain nearby
Fri
H: 67°F
L: 59°F

Air Quality

PM2.5: 4.55 μg/m3
PM10: 4.65 μg/m3
Carbon Monoxide: 177.85 μg/m3
Nitrogen Dioxide: 9.35 μg/m3
Sulphur Dioxide: 3.45 μg/m3
Ozone: 38 μg/m3

Astronomical

Sunrise: 7:02 AM
Sun Transit: 12:20 AM
Sunset: 5:39 PM
Daylight: 10 hrs 37 mins
Moonrise: 2:54 PM
Moon Transit: 9:33 PM
Moonset: 3:15 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 87.1%

Best Times for Fishing or Hunting

Major Periods

7:32 AM - 10:02 AM
9:03 PM - 11:33 PM

Minor Periods

2:24 PM - 3:54 PM
2:45 AM - 4:15 AM

Action Rating: 2 out of 5

Rip Current Statement issued November 30 at 6:07PM CST until December 1 at 6:00PM CST by NWS Brownsville TX

Effective: Sun November 30, 2025, 6:07 PM
Expires: Mon December 1, 2025, 6:00 PM

* WHAT...Dangerous rip currents expected. * WHERE...Kenedy Island, Willacy Island and Cameron Island Counties. * WHEN...Through Monday afternoon. * IMPACTS...Rip currents can sweep even the best swimmers away from shore into deeper water.

Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.
Monday, December 1, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 50.5°F
Average Humidity: 76%
Chance of Rain: 0%
Wind: 15.7 mph
UV Index: 0.7

Air Quality

AQI: 1 - Good
PM2.5: 5.44 μg/m3
PM10: 5.58 μg/m3
Carbon Monoxide: 177.09 μg/m3
Nitrogen Dioxide: 9.64 μg/m3
Sulphur Dioxide: 3.28 μg/m3
Ozone: 41.08 μg/m3

Astronomical

Sunrise: 7:02 AM
Sun Transit: 12:20 AM
Sunset: 5:39 PM
Daylight: 10 hrs 37 mins
Moonrise: 2:54 PM
Moon Transit: 9:33 PM
Moonset: 3:15 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 87.1%

Best Times for Fishing or Hunting

Major Periods

7:32 AM - 10:02 AM
9:03 PM - 11:33 PM

Minor Periods

2:24 PM - 3:54 PM
2:45 AM - 4:15 AM

Action Rating: 2 out of 5

Tuesday, December 2, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 51.7°F
Average Humidity: 56%
Chance of Rain: 0%
Wind: 11.4 mph
UV Index: 0.7

Air Quality

AQI: 1 - Good
PM2.5: 6.61 μg/m3
PM10: 6.65 μg/m3
Carbon Monoxide: 195.57 μg/m3
Nitrogen Dioxide: 13.2 μg/m3
Sulphur Dioxide: 3.41 μg/m3
Ozone: 34.16 μg/m3

Astronomical

Sunrise: 7:03 AM
Sun Transit: 12:21 AM
Sunset: 5:39 PM
Daylight: 10 hrs 37 mins
Moonrise: 3:35 PM
Moon Transit: 10:30 PM
Moonset: 4:22 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 93.7%

Best Times for Fishing or Hunting

Major Periods

8:25 AM - 10:55 AM
12:00 AM - 12:00 AM

Minor Periods

3:05 PM - 4:35 PM
3:52 AM - 5:22 AM

Action Rating: 2 out of 5

Wednesday, December 3, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 62.1°F
Average Humidity: 57%
Chance of Rain: 0%
Wind: 15.2 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 11.27 μg/m3
PM10: 13.03 μg/m3
Carbon Monoxide: 194.57 μg/m3
Nitrogen Dioxide: 15.5 μg/m3
Sulphur Dioxide: 3.52 μg/m3
Ozone: 42.96 μg/m3

Astronomical

Sunrise: 7:03 AM
Sun Transit: 12:21 AM
Sunset: 5:39 PM
Daylight: 10 hrs 36 mins
Moonrise: 4:25 PM
Moon Transit: 11:32 PM
Moonset: 5:33 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 98.1%

Best Times for Fishing or Hunting

Major Periods

9:25 AM - 11:55 AM
12:00 AM - 12:00 AM

Minor Periods

3:55 PM - 5:25 PM
5:03 AM - 6:33 AM

Action Rating: 3 out of 5

Thursday, December 4, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 75.1°F
Average Humidity: 77%
Chance of Rain: 87%
Wind: 18.3 mph
UV Index: 0.5

Air Quality

AQI: 1 - Good
PM2.5: 8.67 μg/m3
PM10: 9.93 μg/m3
Carbon Monoxide: 193.12 μg/m3
Nitrogen Dioxide: 9.66 μg/m3
Sulphur Dioxide: 2.67 μg/m3
Ozone: 50.62 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 12:22 AM
Sunset: 5:40 PM
Daylight: 10 hrs 35 mins
Moonrise: 5:21 PM
Moon Transit: 12:00 AM
Moonset: 6:47 AM
Moon Phase: Full
Moon Illumination: 99.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:30 AM - 1:00 PM

Minor Periods

4:51 PM - 6:21 PM
6:17 AM - 7:47 AM

Action Rating: 3 out of 5

Friday, December 5, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 60.9°F
Average Humidity: 82%
Chance of Rain: 89%
Wind: 15 mph
UV Index: 0

Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:05 AM
Sun Transit: 12:22 AM
Sunset: 5:40 PM
Daylight: 10 hrs 35 mins
Moonrise: 6:27 PM
Moon Transit: 12:38 AM
Moonset: 7:59 AM
Moon Phase: Full
Moon Illumination: 99.2%

Best Times for Fishing or Hunting

Major Periods

12:08 AM - 2:38 AM
11:36 AM - 2:06 PM

Minor Periods

5:57 PM - 7:27 PM
7:29 AM - 8:59 AM

Action Rating: 5 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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