Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

58.3°F

Measurement Time: Saturday, August 1, 2026, 1:30 AM PDT

Temperature Locations

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Local Points of Interest

Happy Isles Bridge; Yosemite National Park

Merced River

Station Name: MERCED R A HAPPY ISLES BRIDGE NR YOSEMITE CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 4,095 feet

Nearest Address:
Happy Isle Loop Rd
Yosemite Valley, CA 95389
Mariposa County

GPS Coordinates: 37.73131496, -119.5590514

Nearby Water Temperatures

Tuolumne River, Groveland, CA (13.9 mi)
Tuolumne River, Groveland, CA (19.3 mi)
Tuolumne River, Groveland, CA (23.5 mi)
Tuolumne River, Groveland, CA (24.7 mi)
Cherry Creek, Groveland, CA (25.5 mi)
Middle Fork San Joaquin River, Mammoth Lakes, CA (26.7 mi)
Deadman Creek, Mammoth Lakes, CA (33.9 mi)
Hot Creek, Mammoth Lakes, CA (38.6 mi)
Hot Creek, Mammoth Lakes, CA (39.2 mi)
Hot Creek, Mammoth Lakes, CA (40.8 mi)
San Joaquin River, Friant, CA (52.4 mi)
Walker Lake, Walker Lake, NV (80.9 mi)
Walker Lake, Walker Lake, NV (83.8 mi)
Trout Creek, South Lake Tahoe, CA (85.1 mi)
Upper Truckee River, South Lake Tahoe, CA (85.6 mi)

Weather for Yosemite Valley, California

Current Weather

72.9°F
Sunny
Sunny
67.8°F
72.4°F
17%
SSE 2.2 mph
6.7 mph
72.9°F
26.3°F
0 in
0%
6 mi
1018 mbar
1.4

Five Day Weather Forecast

Sunny
Sat
H: 85°F
L: 62°F
Sunny
Sun
H: 84°F
L: 60°F
Sunny
Mon
H: 85°F
L: 60°F
Sunny
Tue
H: 86°F
L: 63°F
Sunny
Wed
H: 86°F
L: 64°F

Air Quality

AQI: 1 - Good
PM2.5: 4.1 μg/m3
PM10: 5 μg/m3
Carbon Monoxide: 93 μg/m3
Nitrogen Dioxide: 3.2 μg/m3
Sulphur Dioxide: 0.7 μg/m3
Ozone: 76 μg/m3

Astronomical

Sunrise: 6:02 AM
Sun Transit: 1:04 PM
Sunset: 8:07 PM
Daylight: 14 hrs 5 mins
Moonrise: 9:46 PM
Moon Transit: 3:08 AM
Moonset: 9:03 AM
Moon Phase: Waning Gibbous
Moon Illumination: 84.9%

Best Times for Fishing or Hunting

Major Periods

2:38 AM - 5:08 AM
10:56 AM - 1:26 PM

Minor Periods

9:16 PM - 10:46 PM
8:33 AM - 10:03 AM

Action Rating: 2 out of 5

Heat Advisory issued July 31 at 9:46PM PDT until August 3 at 11:00PM PDT by NWS Hanford CA

Effective: Fri July 31, 2026, 9:46 PM
Expires: Sat August 1, 2026, 6:00 AM

* WHAT...Afternoon high temperatures up to 107 expected. Heat Risk will range from Moderate to Major. * WHERE...San Joaquin Valley and adjacent foothills. * WHEN...From noon Saturday to 11 PM PDT Monday. * IMPACTS...Hot temperatures and limited overnight relief may cause heat illnesses. * ADDITIONAL DETAILS...Afternoon high temperatures up to 107 degrees will occur from Saturday into Monday. Overnight lows will range from the upper 60s in some valley locations to the lower 80s in some of the higher foothills.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Saturday, August 1, 2026

Weather Forecast

Sunny
84.7°F
62.3°F
72°F
19%
0 in
1%
0%
10.7 mph
11.7


Air Quality

AQI: 1 - Good
PM2.5: 4.02 μg/m3
PM10: 5.07 μg/m3
Carbon Monoxide: 92.75 μg/m3
Nitrogen Dioxide: 2.61 μg/m3
Sulphur Dioxide: 1.15 μg/m3
Ozone: 97.46 μg/m3

Astronomical

Sunrise: 6:02 AM
Sun Transit: 1:04 PM
Sunset: 8:07 PM
Daylight: 14 hrs 5 mins
Moonrise: 9:46 PM
Moon Transit: 3:08 AM
Moonset: 9:03 AM
Moon Phase: Waning Gibbous
Moon Illumination: 84.9%

Best Times for Fishing or Hunting

Major Periods

2:38 AM - 5:08 AM
10:56 AM - 1:26 PM

Minor Periods

9:16 PM - 10:46 PM
8:33 AM - 10:03 AM

Action Rating: 2 out of 5

Sunday, August 2, 2026

Weather Forecast

Sunny
83.8°F
60.4°F
71°F
16%
0 in
0%
0%
11 mph
11.5


Air Quality

AQI: 1 - Good
PM2.5: 3.86 μg/m3
PM10: 4.78 μg/m3
Carbon Monoxide: 89.67 μg/m3
Nitrogen Dioxide: 2.56 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 96.71 μg/m3

Astronomical

Sunrise: 6:03 AM
Sun Transit: 1:04 PM
Sunset: 8:06 PM
Daylight: 14 hrs 3 mins
Moonrise: 10:10 PM
Moon Transit: 3:51 AM
Moonset: 10:06 AM
Moon Phase: Waning Gibbous
Moon Illumination: 75.9%

Best Times for Fishing or Hunting

Major Periods

3:21 AM - 5:51 AM
3:20 PM - 5:50 PM

Minor Periods

9:40 PM - 11:10 PM
9:36 AM - 11:06 AM

Action Rating: 3 out of 5

Monday, August 3, 2026

Weather Forecast

Sunny
85.4°F
60.2°F
71.7°F
16%
0 in
0%
0%
11 mph
11.6


Air Quality

AQI: 1 - Good
PM2.5: 4.03 μg/m3
PM10: 5.08 μg/m3
Carbon Monoxide: 89.67 μg/m3
Nitrogen Dioxide: 2.58 μg/m3
Sulphur Dioxide: 0.88 μg/m3
Ozone: 97.25 μg/m3

Astronomical

Sunrise: 6:04 AM
Sun Transit: 1:04 PM
Sunset: 8:05 PM
Daylight: 14 hrs 1 mins
Moonrise: 10:35 PM
Moon Transit: 12:00 AM
Moonset: 11:11 AM
Moon Phase: Waning Gibbous
Moon Illumination: 65.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

10:05 PM - 11:35 PM
10:41 AM - 12:11 AM

Action Rating: 2 out of 5

Tuesday, August 4, 2026

Weather Forecast

Sunny
86.1°F
63°F
73.3°F
18%
0 in
0%
0%
11.2 mph
11.5


Air Quality

AQI: 1 - Good
PM2.5: 6.45 μg/m3
PM10: 10.48 μg/m3
Carbon Monoxide: 106.28 μg/m3
Nitrogen Dioxide: 2.54 μg/m3
Sulphur Dioxide: 0.92 μg/m3
Ozone: 109.54 μg/m3

Astronomical

Sunrise: 6:05 AM
Sun Transit: 1:04 PM
Sunset: 8:04 PM
Daylight: 13 hrs 59 mins
Moonrise: 11:03 PM
Moon Transit: 5:20 AM
Moonset: 12:18 AM
Moon Phase: Last Quarter
Moon Illumination: 54.6%

Best Times for Fishing or Hunting

Major Periods

4:50 AM - 7:20 AM
1:10 PM - 3:40 PM

Minor Periods

12:00 AM - 12:00 AM
11:48 AM - 1:18 PM

Action Rating: 2 out of 5

Wednesday, August 5, 2026

Weather Forecast

Sunny
86.2°F
63.9°F
73.6°F
19%
0 in
0%
0%
11 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 7.63 μg/m3
PM10: 12.85 μg/m3
Carbon Monoxide: 141.83 μg/m3
Nitrogen Dioxide: 4.62 μg/m3
Sulphur Dioxide: 0.8 μg/m3
Ozone: 93.17 μg/m3

Astronomical

Sunrise: 6:06 AM
Sun Transit: 1:04 PM
Sunset: 8:03 PM
Daylight: 13 hrs 57 mins
Moonrise: 12:03 AM
Moon Transit: 6:10 AM
Moonset: 1:28 PM
Moon Phase: Last Quarter
Moon Illumination: 43.2%

Best Times for Fishing or Hunting

Major Periods

5:40 AM - 8:10 AM
2:01 PM - 4:31 PM

Minor Periods

12:58 AM - 2:28 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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