Water Temperature of the Merced River in Yosemite Valley, CA

Current Water Temperature

39.0°F

Measurement Time: Tuesday, December 30, 2025, 7:30 AM PST

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

°F
Overcast
Overcast
73%
°F
°F
mph
mph
°F
millibars
°F
%
0 in
100%
mi
0.1

Five Day Weather Forecast

Overcast
Tue
H: 51°F
L: 35°F
Heavy rain
Wed
H: 46°F
L: 39°F
Heavy rain
Thu
H: 38°F
L: 35°F
Overcast
Fri
H: 34°F
L: 28°F
Heavy snow
Sat
H: 31°F
L: 29°F

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:01 AM
Sunset: 4:49 PM
Daylight: 9 hrs 36 mins
Moonrise: 1:12 PM
Moon Transit: 8:43 PM
Moonset: 3:08 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.8%

Best Times for Fishing or Hunting

Major Periods

3:37 AM - 6:07 AM
8:13 PM - 10:43 PM

Minor Periods

12:42 AM - 2:12 PM
2:38 AM - 4:08 AM

Action Rating: 2 out of 5

Dense Fog Advisory issued December 29 at 10:53PM PST until December 30 at 12:00PM PST by NWS Hanford CA

Effective: Mon December 29, 2025, 10:53 PM
Expires: Tue December 30, 2025, 12:00 PM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...San Joaquin Valley. * WHEN...From 2 AM to noon PST Tuesday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.


Dense Fog Advisory issued December 29 at 4:36PM PST until December 30 at 12:00PM PST by NWS Sacramento CA

Effective: Mon December 29, 2025, 4:36 PM
Expires: Tue December 30, 2025, 12:00 PM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Central Sacramento Valley, Northern San Joaquin Valley, and Southern Sacramento Valley. * WHEN...From 2 AM to noon PST Tuesday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Tuesday, December 30, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 43.9°F
Average Humidity: 44%
Chance of Rain: 0%
Wind: 10.5 mph
UV Index: 0.4

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:01 AM
Sunset: 4:49 PM
Daylight: 9 hrs 36 mins
Moonrise: 1:12 PM
Moon Transit: 8:43 PM
Moonset: 3:08 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.8%

Best Times for Fishing or Hunting

Major Periods

3:37 AM - 6:07 AM
8:13 PM - 10:43 PM

Minor Periods

12:42 AM - 2:12 PM
2:38 AM - 4:08 AM

Action Rating: 2 out of 5

Wednesday, December 31, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 43.4°F
Average Humidity: 75%
Chance of Rain: 89%
Wind: 8.1 mph
UV Index: 0.1

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:01 AM
Sunset: 4:50 PM
Daylight: 9 hrs 37 mins
Moonrise: 1:58 PM
Moon Transit: 9:46 PM
Moonset: 4:26 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.5%

Best Times for Fishing or Hunting

Major Periods

4:37 AM - 7:07 AM
9:16 PM - 11:46 PM

Minor Periods

1:28 PM - 2:58 PM
3:56 AM - 5:26 AM

Action Rating: 3 out of 5

Thursday, January 1, 2026

Weather Forecast

Conditions: Heavy rain
Average Temperature: 37.4°F
Average Humidity: 97%
Chance of Rain: 89%
Wind: 5.6 mph
UV Index: 0.1

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:01 AM
Sunset: 4:51 PM
Daylight: 9 hrs 37 mins
Moonrise: 2:55 PM
Moon Transit: 10:52 PM
Moonset: 5:42 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 96.0%

Best Times for Fishing or Hunting

Major Periods

5:41 AM - 8:11 AM
12:00 AM - 12:00 AM

Minor Periods

2:25 PM - 3:55 PM
5:12 AM - 6:42 AM

Action Rating: 2 out of 5

Friday, January 2, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 33°F
Average Humidity: 89%
Chance of Rain: 0%
Wind: 7.4 mph
UV Index: 0.5

Astronomical

Sunrise: 7:14 AM
Sun Transit: 12:02 AM
Sunset: 4:51 PM
Daylight: 9 hrs 38 mins
Moonrise: 4:03 PM
Moon Transit: 12:00 PM
Moonset: 6:51 AM
Moon Phase: Full
Moon Illumination: 99.2%

Best Times for Fishing or Hunting

Major Periods

6:48 AM - 9:18 AM
12:00 AM - 12:00 AM

Minor Periods

3:33 PM - 5:03 PM
6:21 AM - 7:51 AM

Action Rating: 5 out of 5

Saturday, January 3, 2026

Weather Forecast

Conditions: Heavy snow
Average Temperature: 30.5°F
Average Humidity: 97%
Chance of Rain: 86%
Wind: 13 mph
UV Index: 0.1

Astronomical

Sunrise: 7:14 AM
Sun Transit: 12:02 AM
Sunset: 4:52 PM
Daylight: 9 hrs 39 mins
Moonrise: 5:18 PM
Moon Transit: 12:00 AM
Moonset: 7:49 AM
Moon Phase: Full
Moon Illumination: 99.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:54 AM - 10:24 AM

Minor Periods

4:48 PM - 6:18 PM
7:19 AM - 8:49 AM

Action Rating: 5 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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