Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

60.3°F

Measurement Time: Saturday, August 9, 2025, 12:30 PM PDT

Temperature Locations

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Local Points of Interest

Happy Isles Bridge; Yosemite National Park

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Merced River

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

Elevation Above Sea Level: 4,094 feet / 1,248 meters

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

73.6°F
Clear
Conditions: Clear
Humidity: 16%
Feels Like: 75.4°F
Wind: NE 2.2 mph
Wind Gusts: 4.2 mph
Pressure: 30.26 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Sat
H: 78°F
L: 63°F
Sunny
Sun
H: 78°F
L: 63°F
Sunny
Mon
H: 78°F
L: 66°F
Sunny
Tue
H: 78°F
L: 62°F
Sunny
Wed
H: 79°F
L: 58°F

Air Quality

AQI: 1 - Good
PM2.5: 12.77 μg/m3
PM10: 13.32 μg/m3
Carbon Monoxide: 273.8 μg/m3
Nitrogen Dioxide: 10.18 μg/m3
Sulphur Dioxide: 1.48 μg/m3
Ozone: 64 μg/m3

Astronomical

Sunrise: 6:09 AM
Sun Transit: 1:03 PM
Sunset: 7:58 PM
Daylight: 13 hrs 49 mins
Moonrise: 8:31 PM
Moon Transit: 1:07 AM
Moonset: 6:22 AM
Moon Phase: Full
Moon Illumination: 99.0%

Best Times for Fishing or Hunting

Major Periods

12:37 AM - 3:07 AM
8:57 AM - 11:27 AM

Minor Periods

8:01 PM - 9:31 PM
5:52 AM - 7:22 AM

Action Rating: 5 out of 5

Heat Advisory issued August 9 at 2:59PM PDT until August 11 at 11:00PM PDT by NWS Hanford CA

Effective: Sat August 9, 2025, 2:59 PM
Expires: Sat August 9, 2025, 11:00 PM

* WHAT...High temperatures up to 105 expected. * WHERE...A portion of central California. * WHEN...Until 11 PM PDT Monday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.


Heat Advisory issued August 9 at 2:59PM PDT until August 11 at 11:00PM PDT by NWS Hanford CA

Effective: Sat August 9, 2025, 2:59 PM
Expires: Sat August 9, 2025, 11:00 PM

* WHAT...High temperatures up to 105 expected. * WHERE...A portion of central California. * WHEN...Until 11 PM PDT Monday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Saturday, August 9, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 69.5°F
Average Humidity: 32%
Chance of Rain: 0%
Wind: 11.2 mph
UV Index: 2.6

Air Quality

AQI: 1 - Good
PM2.5: 8.01 μg/m3
PM10: 9.52 μg/m3
Carbon Monoxide: 235.25 μg/m3
Nitrogen Dioxide: 5.42 μg/m3
Sulphur Dioxide: 1.64 μg/m3
Ozone: 105.12 μg/m3

Astronomical

Sunrise: 6:09 AM
Sun Transit: 1:03 PM
Sunset: 7:58 PM
Daylight: 13 hrs 49 mins
Moonrise: 8:31 PM
Moon Transit: 1:07 AM
Moonset: 6:22 AM
Moon Phase: Full
Moon Illumination: 99.0%

Best Times for Fishing or Hunting

Major Periods

12:37 AM - 3:07 AM
8:57 AM - 11:27 AM

Minor Periods

8:01 PM - 9:31 PM
5:52 AM - 7:22 AM

Action Rating: 5 out of 5

Sunday, August 10, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 70.5°F
Average Humidity: 31%
Chance of Rain: 0%
Wind: 11.4 mph
UV Index: 2.4

Air Quality

AQI: 1 - Good
PM2.5: 12.28 μg/m3
PM10: 13.49 μg/m3
Carbon Monoxide: 264.48 μg/m3
Nitrogen Dioxide: 5.42 μg/m3
Sulphur Dioxide: 2.44 μg/m3
Ozone: 118.4 μg/m3

Astronomical

Sunrise: 6:10 AM
Sun Transit: 1:03 PM
Sunset: 7:57 PM
Daylight: 13 hrs 46 mins
Moonrise: 8:58 PM
Moon Transit: 1:56 AM
Moonset: 7:32 AM
Moon Phase: Full
Moon Illumination: 95.5%

Best Times for Fishing or Hunting

Major Periods

1:26 AM - 3:56 AM
9:46 AM - 12:16 AM

Minor Periods

8:28 PM - 9:58 PM
7:02 AM - 8:32 AM

Action Rating: 3 out of 5

Monday, August 11, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 71.3°F
Average Humidity: 29%
Chance of Rain: 0%
Wind: 12.3 mph
UV Index: 2.3

Air Quality

AQI: 1 - Good
PM2.5: 12.62 μg/m3
PM10: 13.51 μg/m3
Carbon Monoxide: 251.67 μg/m3
Nitrogen Dioxide: 5.54 μg/m3
Sulphur Dioxide: 2.34 μg/m3
Ozone: 114.72 μg/m3

Astronomical

Sunrise: 6:11 AM
Sun Transit: 1:03 PM
Sunset: 7:55 PM
Daylight: 13 hrs 44 mins
Moonrise: 9:23 PM
Moon Transit: 2:44 AM
Moonset: 8:42 AM
Moon Phase: Waning Gibbous
Moon Illumination: 89.6%

Best Times for Fishing or Hunting

Major Periods

2:14 AM - 4:44 AM
12:00 AM - 12:00 AM

Minor Periods

8:53 PM - 10:23 PM
8:12 AM - 9:42 AM

Action Rating: 2 out of 5

Tuesday, August 12, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 71.2°F
Average Humidity: 30%
Chance of Rain: 0%
Wind: 11.9 mph
UV Index: 2.6

Air Quality

AQI: 1 - Good
PM2.5: 10.4 μg/m3
PM10: 10.87 μg/m3
Carbon Monoxide: 237.39 μg/m3
Nitrogen Dioxide: 5.31 μg/m3
Sulphur Dioxide: 1.94 μg/m3
Ozone: 114.56 μg/m3

Astronomical

Sunrise: 6:12 AM
Sun Transit: 1:03 PM
Sunset: 7:54 PM
Daylight: 13 hrs 42 mins
Moonrise: 9:49 PM
Moon Transit: 4:21 AM
Moonset: 9:52 AM
Moon Phase: Waning Gibbous
Moon Illumination: 81.8%

Best Times for Fishing or Hunting

Major Periods

3:51 AM - 6:21 AM
3:51 AM - 6:21 AM

Minor Periods

9:19 PM - 10:49 PM
9:22 AM - 10:52 AM

Action Rating: 4 out of 5

Wednesday, August 13, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 67.6°F
Average Humidity: 23%
Chance of Rain: 0%
Wind: 11.4 mph
UV Index: 2.7

Air Quality

AQI: 1 - Good
PM2.5: 13.04 μg/m3
PM10: 13.49 μg/m3
Carbon Monoxide: 289.17 μg/m3
Nitrogen Dioxide: 6.83 μg/m3
Sulphur Dioxide: 1.94 μg/m3
Ozone: 103.54 μg/m3

Astronomical

Sunrise: 6:13 AM
Sun Transit: 1:03 PM
Sunset: 7:53 PM
Daylight: 13 hrs 40 mins
Moonrise: 10:16 PM
Moon Transit: 4:19 AM
Moonset: 11:03 AM
Moon Phase: Waning Gibbous
Moon Illumination: 72.3%

Best Times for Fishing or Hunting

Major Periods

3:49 AM - 6:19 AM
12:09 AM - 2:39 PM

Minor Periods

9:46 PM - 11:16 PM
10:33 AM - 12:03 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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