Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

87.4°F

Measurement Time: Sunday, August 30, 2026, 3:00 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

80°F

Conditions: Sunny

Humidity: 92%

Wind: SE 6 mph

Dew Point: 77°F

Weather Forecast

Today
100°F - Sunny

Tonight
79°F - Mostly Clear

Monday
100°F - Sunny

Monday Night
79°F - Mostly Clear

Tuesday
100°F - Sunny

Tuesday Night
79°F - Mostly Clear

Wednesday
100°F - Sunny

Wednesday Night
78°F - Mostly Clear

Thursday
100°F - Sunny then Slight Chance Showers And Thunderstorms

Thursday Night
78°F - Slight Chance Showers And Thunderstorms then Mostly Clear

Friday
100°F - Sunny then Slight Chance Showers And Thunderstorms

Friday Night
78°F - Slight Chance Showers And Thunderstorms then Mostly Clear

Saturday
100°F - Sunny then Chance Showers And Thunderstorms

Saturday Night
79°F - Chance Showers And Thunderstorms then Mostly Clear

Astronomical

Sunrise: 7:11 AM
Sun Transit: 1:32 PM
Sunset: 7:53 PM
Daylight: 12 hrs 42 mins

Moonrise: 9:21 PM
Moon Transit: 3:03 AM
Moonset: 9:25 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.9%

Best Times for Fishing or Hunting

Major Periods

2:33 AM - 5:03 AM
1:51 PM - 4:21 PM

Minor Periods

8:51 PM - 10:21 PM
8:55 AM - 10:25 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: 7:11 AM
Sun Transit: 1:32 PM
Sunset: 7:53 PM
Daylight: 12 hrs 42 mins

Moonrise: 9:21 PM
Moon Transit: 3:03 AM
Moonset: 9:25 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.9%

Best Times for Fishing or Hunting

Major Periods

2:33 AM - 5:03 AM
1:51 PM - 4:21 PM

Minor Periods

8:51 PM - 10:21 PM
8:55 AM - 10:25 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: 7:11 AM
Sun Transit: 1:32 PM
Sunset: 7:53 PM
Daylight: 12 hrs 42 mins

Moonrise: 9:21 PM
Moon Transit: 3:03 AM
Moonset: 9:25 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.9%

Best Times for Fishing or Hunting

Major Periods

2:33 AM - 5:03 AM
1:51 PM - 4:21 PM

Minor Periods

8:51 PM - 10:21 PM
8:55 AM - 10:25 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: 7:11 AM
Sun Transit: 1:31 PM
Sunset: 7:52 PM
Daylight: 12 hrs 41 mins

Moonrise: 9:56 PM
Moon Transit: 3:49 AM
Moonset: 10:25 AM
Moon Phase: Waning Gibbous
Moon Illumination: 80.9%

Best Times for Fishing or Hunting

Major Periods

3:19 AM - 5:49 AM
2:37 PM - 5:07 PM

Minor Periods

9:26 PM - 10:56 PM
9:55 AM - 11:25 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: 7:11 AM
Sun Transit: 1:31 PM
Sunset: 7:52 PM
Daylight: 12 hrs 41 mins

Moonrise: 9:56 PM
Moon Transit: 3:49 AM
Moonset: 10:25 AM
Moon Phase: Waning Gibbous
Moon Illumination: 80.9%

Best Times for Fishing or Hunting

Major Periods

3:19 AM - 5:49 AM
2:37 PM - 5:07 PM

Minor Periods

9:26 PM - 10:56 PM
9:55 AM - 11:25 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: 7:12 AM
Sun Transit: 1:31 PM
Sunset: 7:51 PM
Daylight: 12 hrs 39 mins

Moonrise: 10:35 PM
Moon Transit: 4:37 AM
Moonset: 11:27 AM
Moon Phase: Waning Gibbous
Moon Illumination: 71.2%

Best Times for Fishing or Hunting

Major Periods

4:07 AM - 6:37 AM
3:27 PM - 5:57 PM

Minor Periods

10:05 PM - 11:35 PM
10:57 AM - 12:27 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: 7:12 AM
Sun Transit: 1:31 PM
Sunset: 7:51 PM
Daylight: 12 hrs 39 mins

Moonrise: 10:35 PM
Moon Transit: 4:37 AM
Moonset: 11:27 AM
Moon Phase: Waning Gibbous
Moon Illumination: 71.2%

Best Times for Fishing or Hunting

Major Periods

4:07 AM - 6:37 AM
3:27 PM - 5:57 PM

Minor Periods

10:05 PM - 11:35 PM
10:57 AM - 12:27 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: 7:12 AM
Sun Transit: 1:31 PM
Sunset: 7:50 PM
Daylight: 12 hrs 38 mins

Moonrise: 11:19 PM
Moon Transit: 5:30 AM
Moonset: 12:32 AM
Moon Phase: Waning Gibbous
Moon Illumination: 60.5%

Best Times for Fishing or Hunting

Major Periods

5:00 AM - 7:30 AM
4:22 PM - 6:52 PM

Minor Periods

12:00 AM - 12:00 AM
12:02 AM - 1:32 PM

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: 7:12 AM
Sun Transit: 1:31 PM
Sunset: 7:50 PM
Daylight: 12 hrs 38 mins

Moonrise: 11:19 PM
Moon Transit: 5:30 AM
Moonset: 12:32 AM
Moon Phase: Waning Gibbous
Moon Illumination: 60.5%

Best Times for Fishing or Hunting

Major Periods

5:00 AM - 7:30 AM
4:22 PM - 6:52 PM

Minor Periods

12:00 AM - 12:00 AM
12:02 AM - 1:32 PM

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: 7:12 AM
Sun Transit: 1:30 PM
Sunset: 7:49 PM
Daylight: 12 hrs 36 mins

Moonrise: 12:19 AM
Moon Transit: 6:26 AM
Moonset: 1:38 PM
Moon Phase: Last Quarter
Moon Illumination: 49.2%

Best Times for Fishing or Hunting

Major Periods

5:56 AM - 8:26 AM
5:20 PM - 7:50 PM

Minor Periods

1:08 PM - 2:38 PM
12:00 AM - 12:00 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: 7:12 AM
Sun Transit: 1:30 PM
Sunset: 7:49 PM
Daylight: 12 hrs 36 mins

Moonrise: 12:19 AM
Moon Transit: 6:26 AM
Moonset: 1:38 PM
Moon Phase: Last Quarter
Moon Illumination: 49.2%

Best Times for Fishing or Hunting

Major Periods

5:56 AM - 8:26 AM
5:20 PM - 7:50 PM

Minor Periods

1:08 PM - 2:38 PM
12:00 AM - 12:00 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: 7:13 AM
Sun Transit: 1:30 PM
Sunset: 7:48 PM
Daylight: 12 hrs 35 mins

Moonrise: 12:12 AM
Moon Transit: 7:27 AM
Moonset: 2:45 PM
Moon Phase: Last Quarter
Moon Illumination: 38.0%

Best Times for Fishing or Hunting

Major Periods

6:57 AM - 9:27 AM
6:22 PM - 8:52 PM

Minor Periods

2:15 PM - 3:45 PM
12:00 AM - 12:00 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: 7:13 AM
Sun Transit: 1:30 PM
Sunset: 7:48 PM
Daylight: 12 hrs 35 mins

Moonrise: 12:12 AM
Moon Transit: 7:27 AM
Moonset: 2:45 PM
Moon Phase: Last Quarter
Moon Illumination: 38.0%

Best Times for Fishing or Hunting

Major Periods

6:57 AM - 9:27 AM
6:22 PM - 8:52 PM

Minor Periods

2:15 PM - 3:45 PM
12:00 AM - 12:00 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: 7:13 AM
Sun Transit: 1:30 PM
Sunset: 7:47 PM
Daylight: 12 hrs 33 mins

Moonrise: 1:11 AM
Moon Transit: 8:29 AM
Moonset: 3:47 PM
Moon Phase: Last Quarter
Moon Illumination: 27.4%

Best Times for Fishing or Hunting

Major Periods

7:59 AM - 10:29 AM
7:25 PM - 9:55 PM

Minor Periods

3:17 PM - 4:47 PM
12:41 AM - 2:11 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: 7:13 AM
Sun Transit: 1:30 PM
Sunset: 7:47 PM
Daylight: 12 hrs 33 mins

Moonrise: 1:11 AM
Moon Transit: 8:29 AM
Moonset: 3:47 PM
Moon Phase: Last Quarter
Moon Illumination: 27.4%

Best Times for Fishing or Hunting

Major Periods

7:59 AM - 10:29 AM
7:25 PM - 9:55 PM

Minor Periods

3:17 PM - 4:47 PM
12:41 AM - 2:11 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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