Water Temperature of the Rio Grande in Mercedes, TX

Current Water Temperature

87.4°F

Measurement Time: Sunday, September 27, 2026, 6:00 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

89°F
Sunny
Sunny
61%
SE 5 mph
74°F

Weather Forecast

Mostly Sunny
Today
99°F - Mostly Sunny
Partly Cloudy
Tonight
75°F - Partly Cloudy
Mostly Sunny
Monday
98°F - Mostly Sunny
Partly Cloudy
Monday Night
77°F - Partly Cloudy
Mostly Sunny
Tuesday
99°F - Mostly Sunny
Partly Cloudy
Tuesday Night
79°F - Partly Cloudy
Mostly Sunny
Wednesday
99°F - Mostly Sunny
Partly Cloudy then Slight Chance Rain Showers
Wednesday Night
79°F - Partly Cloudy then Slight Chance Rain Showers
Showers And Thunderstorms Likely
Thursday
97°F - Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Thursday Night
76°F - Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Friday
93°F - Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Friday Night
74°F - Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Saturday
91°F - Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Saturday Night
74°F - Showers And Thunderstorms Likely

Astronomical

Sunrise: 7:22 AM
Sun Transit: 1:22 PM
Sunset: 7:22 PM
Daylight: 12 hrs mins
Moonrise: 7:55 PM
Moon Transit: 12:00 AM
Moonset: 8:15 AM
Moon Phase: Full
Moon Illumination: 97.3%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:32 AM - 3:02 PM

Minor Periods

7:25 PM - 8:55 PM
7:45 AM - 9:15 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:22 PM
Daylight: 12 hrs mins
Moonrise: 7:55 PM
Moon Transit: 12:00 AM
Moonset: 8:15 AM
Moon Phase: Full
Moon Illumination: 97.3%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:32 AM - 3:02 PM

Minor Periods

7:25 PM - 8:55 PM
7:45 AM - 9:15 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:22 PM
Daylight: 12 hrs mins
Moonrise: 7:55 PM
Moon Transit: 12:00 AM
Moonset: 8:15 AM
Moon Phase: Full
Moon Illumination: 97.3%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:32 AM - 3:02 PM

Minor Periods

7:25 PM - 8:55 PM
7:45 AM - 9:15 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:21 PM
Daylight: 11 hrs 58 mins
Moonrise: 8:34 PM
Moon Transit: 2:32 AM
Moonset: 9:17 AM
Moon Phase: Full
Moon Illumination: 92.4%

Best Times for Fishing or Hunting

Major Periods

2:02 AM - 4:32 AM
1:22 PM - 3:52 PM

Minor Periods

8:04 PM - 9:34 PM
8:47 AM - 10:17 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:21 PM
Daylight: 11 hrs 58 mins
Moonrise: 8:34 PM
Moon Transit: 2:32 AM
Moonset: 9:17 AM
Moon Phase: Full
Moon Illumination: 92.4%

Best Times for Fishing or Hunting

Major Periods

2:02 AM - 4:32 AM
1:22 PM - 3:52 PM

Minor Periods

8:04 PM - 9:34 PM
8:47 AM - 10:17 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:23 AM
Sun Transit: 1:21 PM
Sunset: 7:20 PM
Daylight: 11 hrs 57 mins
Moonrise: 9:17 PM
Moon Transit: 3:24 AM
Moonset: 10:23 AM
Moon Phase: Waning Gibbous
Moon Illumination: 85.4%

Best Times for Fishing or Hunting

Major Periods

2:54 AM - 5:24 AM
2:16 PM - 4:46 PM

Minor Periods

8:47 PM - 10:17 PM
9:53 AM - 11:23 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:23 AM
Sun Transit: 1:21 PM
Sunset: 7:20 PM
Daylight: 11 hrs 57 mins
Moonrise: 9:17 PM
Moon Transit: 3:24 AM
Moonset: 10:23 AM
Moon Phase: Waning Gibbous
Moon Illumination: 85.4%

Best Times for Fishing or Hunting

Major Periods

2:54 AM - 5:24 AM
2:16 PM - 4:46 PM

Minor Periods

8:47 PM - 10:17 PM
9:53 AM - 11:23 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:23 AM
Sun Transit: 1:21 PM
Sunset: 7:19 PM
Daylight: 11 hrs 55 mins
Moonrise: 10:08 PM
Moon Transit: 4:21 AM
Moonset: 11:30 AM
Moon Phase: Waning Gibbous
Moon Illumination: 76.5%

Best Times for Fishing or Hunting

Major Periods

3:51 AM - 6:21 AM
3:14 PM - 5:44 PM

Minor Periods

9:38 PM - 11:08 PM
11:00 AM - 12:30 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:23 AM
Sun Transit: 1:21 PM
Sunset: 7:19 PM
Daylight: 11 hrs 55 mins
Moonrise: 10:08 PM
Moon Transit: 4:21 AM
Moonset: 11:30 AM
Moon Phase: Waning Gibbous
Moon Illumination: 76.5%

Best Times for Fishing or Hunting

Major Periods

3:51 AM - 6:21 AM
3:14 PM - 5:44 PM

Minor Periods

9:38 PM - 11:08 PM
11:00 AM - 12:30 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:24 AM
Sun Transit: 1:21 PM
Sunset: 7:18 PM
Daylight: 11 hrs 54 mins
Moonrise: 11:06 PM
Moon Transit: 5:21 AM
Moonset: 12:38 AM
Moon Phase: Waning Gibbous
Moon Illumination: 66.3%

Best Times for Fishing or Hunting

Major Periods

4:51 AM - 7:21 AM
4:16 PM - 6:46 PM

Minor Periods

12:00 AM - 12:00 AM
12:08 AM - 1:38 PM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:24 AM
Sun Transit: 1:21 PM
Sunset: 7:18 PM
Daylight: 11 hrs 54 mins
Moonrise: 11:06 PM
Moon Transit: 5:21 AM
Moonset: 12:38 AM
Moon Phase: Waning Gibbous
Moon Illumination: 66.3%

Best Times for Fishing or Hunting

Major Periods

4:51 AM - 7:21 AM
4:16 PM - 6:46 PM

Minor Periods

12:00 AM - 12:00 AM
12:08 AM - 1:38 PM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:24 AM
Sun Transit: 1:20 PM
Sunset: 7:17 PM
Daylight: 11 hrs 52 mins
Moonrise: 12:06 AM
Moon Transit: 6:24 AM
Moonset: 1:42 PM
Moon Phase: Last Quarter
Moon Illumination: 55.3%

Best Times for Fishing or Hunting

Major Periods

5:54 AM - 8:24 AM
5:19 PM - 7:49 PM

Minor Periods

1:12 PM - 2:42 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:24 AM
Sun Transit: 1:20 PM
Sunset: 7:17 PM
Daylight: 11 hrs 52 mins
Moonrise: 12:06 AM
Moon Transit: 6:24 AM
Moonset: 1:42 PM
Moon Phase: Last Quarter
Moon Illumination: 55.3%

Best Times for Fishing or Hunting

Major Periods

5:54 AM - 8:24 AM
5:19 PM - 7:49 PM

Minor Periods

1:12 PM - 2:42 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:16 PM
Daylight: 11 hrs 51 mins
Moonrise: 12:10 AM
Moon Transit: 7:26 AM
Moonset: 2:40 PM
Moon Phase: Last Quarter
Moon Illumination: 43.9%

Best Times for Fishing or Hunting

Major Periods

6:56 AM - 9:26 AM
6:20 PM - 8:50 PM

Minor Periods

2:10 PM - 3:40 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


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: 7:16 PM
Daylight: 11 hrs 51 mins
Moonrise: 12:10 AM
Moon Transit: 7:26 AM
Moonset: 2:40 PM
Moon Phase: Last Quarter
Moon Illumination: 43.9%

Best Times for Fishing or Hunting

Major Periods

6:56 AM - 9:26 AM
6:20 PM - 8:50 PM

Minor Periods

2:10 PM - 3:40 PM
12:00 AM - 12:00 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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