Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

88.5°F

Measurement Time: Sunday, September 20, 2026, 5:00 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

86°F

Conditions: Sunny

Humidity: 72%

Wind: 0 mph

Dew Point: 76°F

Weather Forecast

Today
99°F - Mostly Sunny

Tonight
77°F - Partly Cloudy

Monday
98°F - Sunny then Chance Showers And Thunderstorms

Monday Night
77°F - Clear

Tuesday
97°F - Slight Chance Rain Showers then Chance Showers And Thunderstorms

Tuesday Night
77°F - Chance Showers And Thunderstorms then Mostly Clear

Wednesday
96°F - Chance Rain Showers then Chance Showers And Thunderstorms

Wednesday Night
77°F - Chance Showers And Thunderstorms then Mostly Clear

Thursday
96°F - Chance Rain Showers then Chance Showers And Thunderstorms

Thursday Night
77°F - Chance Showers And Thunderstorms

Friday
95°F - Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms

Friday Night
76°F - Chance Showers And Thunderstorms then Partly Cloudy

Saturday
96°F - Chance Showers And Thunderstorms

Saturday Night
76°F - Chance Showers And Thunderstorms then Partly Cloudy

Astronomical

Sunrise: 7:19 AM
Sun Transit: 1:24 PM
Sunset: 7:30 PM
Daylight: 12 hrs 11 mins

Moonrise: 3:55 PM
Moon Transit: 9:10 PM
Moonset: 1:34 AM
Moon Phase: First Quarter
Moon Illumination: 65.4%

Best Times for Fishing or Hunting

Major Periods

7:10 AM - 9:40 AM
8:40 PM - 11:10 PM

Minor Periods

3:25 PM - 4:55 PM
1:04 AM - 2:34 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: 7:19 AM
Sun Transit: 1:24 PM
Sunset: 7:30 PM
Daylight: 12 hrs 11 mins

Moonrise: 3:55 PM
Moon Transit: 9:10 PM
Moonset: 1:34 AM
Moon Phase: First Quarter
Moon Illumination: 65.4%

Best Times for Fishing or Hunting

Major Periods

7:10 AM - 9:40 AM
8:40 PM - 11:10 PM

Minor Periods

3:25 PM - 4:55 PM
1:04 AM - 2:34 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: 7:19 AM
Sun Transit: 1:24 PM
Sunset: 7:30 PM
Daylight: 12 hrs 11 mins

Moonrise: 3:55 PM
Moon Transit: 9:10 PM
Moonset: 1:34 AM
Moon Phase: First Quarter
Moon Illumination: 65.4%

Best Times for Fishing or Hunting

Major Periods

7:10 AM - 9:40 AM
8:40 PM - 11:10 PM

Minor Periods

3:25 PM - 4:55 PM
1:04 AM - 2:34 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: 7:20 AM
Sun Transit: 1:24 PM
Sunset: 7:29 PM
Daylight: 12 hrs 9 mins

Moonrise: 4:35 PM
Moon Transit: 9:58 PM
Moonset: 2:31 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 75.7%

Best Times for Fishing or Hunting

Major Periods

7:59 AM - 10:29 AM
9:28 PM - 11:58 PM

Minor Periods

4:05 PM - 5:35 PM
2:01 AM - 3:31 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: 7:20 AM
Sun Transit: 1:24 PM
Sunset: 7:29 PM
Daylight: 12 hrs 9 mins

Moonrise: 4:35 PM
Moon Transit: 9:58 PM
Moonset: 2:31 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 75.7%

Best Times for Fishing or Hunting

Major Periods

7:59 AM - 10:29 AM
9:28 PM - 11:58 PM

Minor Periods

4:05 PM - 5:35 PM
2:01 AM - 3:31 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: 7:20 AM
Sun Transit: 1:24 PM
Sunset: 7:28 PM
Daylight: 12 hrs 8 mins

Moonrise: 5:11 PM
Moon Transit: 10:45 PM
Moonset: 3:27 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 84.7%

Best Times for Fishing or Hunting

Major Periods

8:47 AM - 11:17 AM
12:00 AM - 12:00 AM

Minor Periods

4:41 PM - 6:11 PM
2:57 AM - 4:27 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: 7:20 AM
Sun Transit: 1:24 PM
Sunset: 7:28 PM
Daylight: 12 hrs 8 mins

Moonrise: 5:11 PM
Moon Transit: 10:45 PM
Moonset: 3:27 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 84.7%

Best Times for Fishing or Hunting

Major Periods

8:47 AM - 11:17 AM
12:00 AM - 12:00 AM

Minor Periods

4:41 PM - 6:11 PM
2:57 AM - 4:27 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: 7:20 AM
Sun Transit: 1:23 PM
Sunset: 7:26 PM
Daylight: 12 hrs 6 mins

Moonrise: 5:45 PM
Moon Transit: 11:29 PM
Moonset: 4:24 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.9%

Best Times for Fishing or Hunting

Major Periods

9:32 AM - 12:02 AM
12:00 AM - 12:00 AM

Minor Periods

5:15 PM - 6:45 PM
3:54 AM - 5:24 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: 7:20 AM
Sun Transit: 1:23 PM
Sunset: 7:26 PM
Daylight: 12 hrs 6 mins

Moonrise: 5:45 PM
Moon Transit: 11:29 PM
Moonset: 4:24 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.9%

Best Times for Fishing or Hunting

Major Periods

9:32 AM - 12:02 AM
12:00 AM - 12:00 AM

Minor Periods

5:15 PM - 6:45 PM
3:54 AM - 5:24 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: 7:21 AM
Sun Transit: 1:23 PM
Sunset: 7:25 PM
Daylight: 12 hrs 5 mins

Moonrise: 6:17 PM
Moon Transit: 12:00 AM
Moonset: 5:20 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:16 AM - 12:46 AM

Minor Periods

5:47 PM - 7:17 PM
4:50 AM - 6:20 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: 7:21 AM
Sun Transit: 1:23 PM
Sunset: 7:25 PM
Daylight: 12 hrs 5 mins

Moonrise: 6:17 PM
Moon Transit: 12:00 AM
Moonset: 5:20 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:16 AM - 12:46 AM

Minor Periods

5:47 PM - 7:17 PM
4:50 AM - 6:20 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: 7:21 AM
Sun Transit: 1:23 PM
Sunset: 7:24 PM
Daylight: 12 hrs 3 mins

Moonrise: 6:49 PM
Moon Transit: 12:13 AM
Moonset: 6:17 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:00 AM - 1:30 PM

Minor Periods

6:19 PM - 7:49 PM
5:47 AM - 7:17 AM

Action Rating: 5 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: 7:21 AM
Sun Transit: 1:23 PM
Sunset: 7:24 PM
Daylight: 12 hrs 3 mins

Moonrise: 6:49 PM
Moon Transit: 12:13 AM
Moonset: 6:17 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:00 AM - 1:30 PM

Minor Periods

6:19 PM - 7:49 PM
5:47 AM - 7:17 AM

Action Rating: 5 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: 7:22 AM
Sun Transit: 1:22 PM
Sunset: 7:23 PM
Daylight: 12 hrs 2 mins

Moonrise: 7:21 PM
Moon Transit: 12:58 AM
Moonset: 7:15 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:28 AM - 2:58 AM
7:03 AM - 9:33 AM

Minor Periods

6:51 PM - 8:21 PM
6:45 AM - 8:15 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: 7:22 AM
Sun Transit: 1:22 PM
Sunset: 7:23 PM
Daylight: 12 hrs 2 mins

Moonrise: 7:21 PM
Moon Transit: 12:58 AM
Moonset: 7:15 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:28 AM - 2:58 AM
7:03 AM - 9:33 AM

Minor Periods

6:51 PM - 8:21 PM
6:45 AM - 8:15 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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