Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

84.4°F

Measurement Time: Sunday, October 4, 2026, 7:00 AM 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

Conditions: Showers And Thunderstorms Likely

Humidity: 87%

Wind: N 15 mph

Dew Point: 76°F

Weather Forecast

This Afternoon
84°F - Showers And Thunderstorms

Tonight
73°F - Showers And Thunderstorms

Monday
84°F - Showers And Thunderstorms

Monday Night
72°F - Chance Showers And Thunderstorms then Showers And Thunderstorms Likely

Tuesday
89°F - Chance Showers And Thunderstorms

Tuesday Night
71°F - Chance Showers And Thunderstorms then Mostly Clear

Wednesday
92°F - Sunny then Chance Showers And Thunderstorms

Wednesday Night
72°F - Chance Showers And Thunderstorms then Mostly Clear

Thursday
89°F - Showers And Thunderstorms Likely

Thursday Night
71°F - Showers And Thunderstorms Likely

Friday
89°F - Chance Rain Showers

Friday Night
71°F - Chance Showers And Thunderstorms

Saturday
91°F - Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms

Saturday Night
72°F - Slight Chance Showers And Thunderstorms then Partly Cloudy

Astronomical

Sunrise: 7:25 AM
Sun Transit: 1:20 PM
Sunset: 7:15 PM
Daylight: 11 hrs 49 mins

Moonrise: 1:17 AM
Moon Transit: 8:26 AM
Moonset: 3:30 PM
Moon Phase: Last Quarter
Moon Illumination: 32.9%

Best Times for Fishing or Hunting

Major Periods

7:56 AM - 10:26 AM
7:19 PM - 9:49 PM

Minor Periods

3:00 PM - 4:30 PM
12:47 AM - 2:17 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:25 AM
Sun Transit: 1:20 PM
Sunset: 7:15 PM
Daylight: 11 hrs 49 mins

Moonrise: 1:17 AM
Moon Transit: 8:26 AM
Moonset: 3:30 PM
Moon Phase: Last Quarter
Moon Illumination: 32.9%

Best Times for Fishing or Hunting

Major Periods

7:56 AM - 10:26 AM
7:19 PM - 9:49 PM

Minor Periods

3:00 PM - 4:30 PM
12:47 AM - 2:17 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:25 AM
Sun Transit: 1:20 PM
Sunset: 7:15 PM
Daylight: 11 hrs 49 mins

Moonrise: 1:17 AM
Moon Transit: 8:26 AM
Moonset: 3:30 PM
Moon Phase: Last Quarter
Moon Illumination: 32.9%

Best Times for Fishing or Hunting

Major Periods

7:56 AM - 10:26 AM
7:19 PM - 9:49 PM

Minor Periods

3:00 PM - 4:30 PM
12:47 AM - 2:17 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:26 AM
Sun Transit: 1:19 PM
Sunset: 7:13 PM
Daylight: 11 hrs 48 mins

Moonrise: 2:24 AM
Moon Transit: 9:22 AM
Moonset: 4:13 PM
Moon Phase: Last Quarter
Moon Illumination: 22.8%

Best Times for Fishing or Hunting

Major Periods

8:52 AM - 11:22 AM
8:12 PM - 10:42 PM

Minor Periods

3:43 PM - 5:13 PM
1:54 AM - 3:24 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:26 AM
Sun Transit: 1:19 PM
Sunset: 7:13 PM
Daylight: 11 hrs 48 mins

Moonrise: 2:24 AM
Moon Transit: 9:22 AM
Moonset: 4:13 PM
Moon Phase: Last Quarter
Moon Illumination: 22.8%

Best Times for Fishing or Hunting

Major Periods

8:52 AM - 11:22 AM
8:12 PM - 10:42 PM

Minor Periods

3:43 PM - 5:13 PM
1:54 AM - 3:24 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:26 AM
Sun Transit: 1:19 PM
Sunset: 7:12 PM
Daylight: 11 hrs 46 mins

Moonrise: 3:28 AM
Moon Transit: 10:13 AM
Moonset: 4:52 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.1%

Best Times for Fishing or Hunting

Major Periods

9:02 PM - 11:32 PM
9:43 AM - 12:13 AM

Minor Periods

4:22 PM - 5:52 PM
2:58 AM - 4:28 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:26 AM
Sun Transit: 1:19 PM
Sunset: 7:12 PM
Daylight: 11 hrs 46 mins

Moonrise: 3:28 AM
Moon Transit: 10:13 AM
Moonset: 4:52 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.1%

Best Times for Fishing or Hunting

Major Periods

9:02 PM - 11:32 PM
9:43 AM - 12:13 AM

Minor Periods

4:22 PM - 5:52 PM
2:58 AM - 4:28 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:26 AM
Sun Transit: 1:19 PM
Sunset: 7:11 PM
Daylight: 11 hrs 45 mins

Moonrise: 4:31 AM
Moon Transit: 11:01 AM
Moonset: 5:26 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:31 AM - 1:01 PM

Minor Periods

4:56 PM - 6:26 PM
4:01 AM - 5:31 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:26 AM
Sun Transit: 1:19 PM
Sunset: 7:11 PM
Daylight: 11 hrs 45 mins

Moonrise: 4:31 AM
Moon Transit: 11:01 AM
Moonset: 5:26 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:31 AM - 1:01 PM

Minor Periods

4:56 PM - 6:26 PM
4:01 AM - 5:31 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:27 AM
Sun Transit: 1:19 PM
Sunset: 7:10 PM
Daylight: 11 hrs 43 mins

Moonrise: 5:30 AM
Moon Transit: 11:47 AM
Moonset: 5:58 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:17 AM - 1:47 PM

Minor Periods

5:28 PM - 6:58 PM
5:00 AM - 6:30 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:27 AM
Sun Transit: 1:19 PM
Sunset: 7:10 PM
Daylight: 11 hrs 43 mins

Moonrise: 5:30 AM
Moon Transit: 11:47 AM
Moonset: 5:58 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:17 AM - 1:47 PM

Minor Periods

5:28 PM - 6:58 PM
5:00 AM - 6:30 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:27 AM
Sun Transit: 1:18 PM
Sunset: 7:09 PM
Daylight: 11 hrs 42 mins

Moonrise: 6:29 AM
Moon Transit: 12:32 AM
Moonset: 6:30 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:02 AM - 2:32 PM

Minor Periods

6:00 PM - 7:30 PM
5:59 AM - 7:29 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:27 AM
Sun Transit: 1:18 PM
Sunset: 7:09 PM
Daylight: 11 hrs 42 mins

Moonrise: 6:29 AM
Moon Transit: 12:32 AM
Moonset: 6:30 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:02 AM - 2:32 PM

Minor Periods

6:00 PM - 7:30 PM
5:59 AM - 7:29 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:28 AM
Sun Transit: 1:18 PM
Sunset: 7:08 PM
Daylight: 11 hrs 40 mins

Moonrise: 7:26 AM
Moon Transit: 1:17 PM
Moonset: 7:02 PM
Moon Phase: New
Moon Illumination: 0.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:47 AM - 3:17 PM

Minor Periods

6:32 PM - 8:02 PM
6:56 AM - 8:26 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:28 AM
Sun Transit: 1:18 PM
Sunset: 7:08 PM
Daylight: 11 hrs 40 mins

Moonrise: 7:26 AM
Moon Transit: 1:17 PM
Moonset: 7:02 PM
Moon Phase: New
Moon Illumination: 0.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:47 AM - 3:17 PM

Minor Periods

6:32 PM - 8:02 PM
6:56 AM - 8:26 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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