Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

75.2°F

Measurement Time: Sunday, December 28, 2025, 5:15 AM 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: 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

86.4°F
Partly sunny
Conditions: Partly sunny
Humidity: 49%
Heat Index: 89°F
Feels Like: 89°F
Wind: S 7.5 mph
Wind Gusts: 21 mph
Wind Chill: 86.4°F
Air Pressure: 1011.99 millibars
Dew Point: 86.4°F
Chance of Precipitation: 5%
Precipitation: 0 in
Cloud Cover: 75%
Visibility: 10 mi
UV Index: 3

Five Day Weather Forecast

Sunny
Sun
H: 88°F
L: 67°F
Overcast
Mon
H: 70°F
L: 51°F
Overcast
Tue
H: 56°F
L: 48°F
Sunny
Wed
H: 72°F
L: 53°F
Partly Cloudy
Thu
H: 80°F
L: 61°F

Air Quality

AQI: 1 - Good
PM2.5: 6.35 μg/m3
PM10: 7.85 μg/m3
Carbon Monoxide: 137.85 μg/m3
Nitrogen Dioxide: 6.15 μg/m3
Sulphur Dioxide: 1.95 μg/m3
Ozone: 69 μg/m3

Astronomical

Sunrise: 7:17 AM
Sun Transit: 12:33 AM
Sunset: 5:49 PM
Daylight: 10 hrs 32 mins
Moonrise: 12:50 AM
Moon Transit: 7:23 PM
Moonset: 1:02 AM
Moon Phase: First Quarter
Moon Illumination: 63.0%

Best Times for Fishing or Hunting

Major Periods

5:23 AM - 7:53 AM
6:53 PM - 9:23 PM

Minor Periods

12:20 AM - 1:50 PM
12:32 AM - 2:02 AM

Action Rating: 2 out of 5

Wind Advisory issued December 27 at 10:10PM CST until December 29 at 6:00PM CST by NWS Brownsville TX

Effective: Sat December 27, 2025, 10:10 PM
Expires: Sun December 28, 2025, 9:00 AM

* WHAT...North winds 20 to 30 mph with gusts up to 45 mph expected. * WHERE...All of Deep South Texas. * WHEN...From 3 AM to 6 PM CST Monday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Gusty winds will blow around unsecured objects, such as garbage cans, outdoor furniture, and trampolines. If there is time, trim or remove dead tree limbs.


Wind Advisory issued December 28 at 9:09AM CST until December 29 at 6:00PM CST by NWS Brownsville TX

Effective: Sun December 28, 2025, 9:09 AM
Expires: Sun December 28, 2025, 9:00 PM

* WHAT...North winds 20 to 30 mph with gusts up to 45 mph expected. * WHERE...A portion of Deep South Texas. * WHEN...From 3 AM to 6 PM CST Monday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Gusty winds will blow around unsecured objects, such as garbage cans, outdoor furniture, and trampolines. If there is time, trim or remove dead tree limbs.
Sunday, December 28, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 75.5°F
Average Humidity: 78%
Chance of Rain: 0%
Wind: 19.9 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 5.73 μg/m3
PM10: 7.37 μg/m3
Carbon Monoxide: 127.85 μg/m3
Nitrogen Dioxide: 3.29 μg/m3
Sulphur Dioxide: 1.77 μg/m3
Ozone: 74.84 μg/m3

Astronomical

Sunrise: 7:17 AM
Sun Transit: 12:33 AM
Sunset: 5:49 PM
Daylight: 10 hrs 32 mins
Moonrise: 12:50 AM
Moon Transit: 7:23 PM
Moonset: 1:02 AM
Moon Phase: First Quarter
Moon Illumination: 63.0%

Best Times for Fishing or Hunting

Major Periods

5:23 AM - 7:53 AM
6:53 PM - 9:23 PM

Minor Periods

12:20 AM - 1:50 PM
12:32 AM - 2:02 AM

Action Rating: 2 out of 5

Monday, December 29, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 61°F
Average Humidity: 58%
Chance of Rain: 0%
Wind: 24.4 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 6.52 μg/m3
PM10: 7.87 μg/m3
Carbon Monoxide: 163.77 μg/m3
Nitrogen Dioxide: 6.87 μg/m3
Sulphur Dioxide: 2.35 μg/m3
Ozone: 58.6 μg/m3

Astronomical

Sunrise: 7:18 AM
Sun Transit: 12:33 AM
Sunset: 5:50 PM
Daylight: 10 hrs 32 mins
Moonrise: 1:27 PM
Moon Transit: 8:15 PM
Moonset: 2:05 AM
Moon Phase: First Quarter
Moon Illumination: 73.5%

Best Times for Fishing or Hunting

Major Periods

6:13 AM - 8:43 AM
7:45 PM - 10:15 PM

Minor Periods

12:57 AM - 2:27 PM
1:35 AM - 3:05 AM

Action Rating: 2 out of 5

Tuesday, December 30, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 52.3°F
Average Humidity: 24%
Chance of Rain: 0%
Wind: 13.4 mph
UV Index: 0.3

Air Quality

AQI: 1 - Good
PM2.5: 3.31 μg/m3
PM10: 3.32 μg/m3
Carbon Monoxide: 165.73 μg/m3
Nitrogen Dioxide: 6.37 μg/m3
Sulphur Dioxide: 2.63 μg/m3
Ozone: 65.8 μg/m3

Astronomical

Sunrise: 7:18 AM
Sun Transit: 12:34 AM
Sunset: 5:50 PM
Daylight: 10 hrs 32 mins
Moonrise: 2:11 PM
Moon Transit: 9:12 PM
Moonset: 3:11 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.8%

Best Times for Fishing or Hunting

Major Periods

7:07 AM - 9:37 AM
8:42 PM - 11:12 PM

Minor Periods

1:41 PM - 3:11 PM
2:41 AM - 4:11 AM

Action Rating: 3 out of 5

Wednesday, December 31, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 61.2°F
Average Humidity: 58%
Chance of Rain: 0%
Wind: 12.1 mph
UV Index: 0.9

Air Quality

AQI: 1 - Good
PM2.5: 5.94 μg/m3
PM10: 6.15 μg/m3
Carbon Monoxide: 198.67 μg/m3
Nitrogen Dioxide: 11.47 μg/m3
Sulphur Dioxide: 3.12 μg/m3
Ozone: 55.8 μg/m3

Astronomical

Sunrise: 7:18 AM
Sun Transit: 12:34 AM
Sunset: 5:51 PM
Daylight: 10 hrs 33 mins
Moonrise: 3:02 PM
Moon Transit: 10:15 PM
Moonset: 4:22 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.5%

Best Times for Fishing or Hunting

Major Periods

8:07 AM - 10:37 AM
12:00 AM - 12:00 AM

Minor Periods

2:32 PM - 4:02 PM
3:52 AM - 5:22 AM

Action Rating: 2 out of 5

Thursday, January 1, 2026

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 66.5°F
Average Humidity: 76%
Chance of Rain: 0%
Wind: 10.1 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 10.54 μg/m3
PM10: 12.09 μg/m3
Carbon Monoxide: 232.1 μg/m3
Nitrogen Dioxide: 13.57 μg/m3
Sulphur Dioxide: 3.11 μg/m3
Ozone: 55.77 μg/m3

Astronomical

Sunrise: 7:19 AM
Sun Transit: 12:35 AM
Sunset: 5:52 PM
Daylight: 10 hrs 33 mins
Moonrise: 4:03 PM
Moon Transit: 11:22 PM
Moonset: 5:33 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 96.0%

Best Times for Fishing or Hunting

Major Periods

9:12 AM - 11:42 AM
12:00 AM - 12:00 AM

Minor Periods

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