Water Temperature of the Middle Fork San Joaquin River in Mammoth Lakes, CA

Current Water Temperature

42.6°F

Measurement Time: Tuesday, May 26, 2026, 6:00 AM PDT

Temperature Locations

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Local Points of Interest

Devils Postpile National Monument

Middle Fork San Joaquin River

Station Name: MF SAN JOAQUIN R NR MAMMOTH LAKES CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 7,618 feet

Nearest Address:
A12 Devils Postpile Campground Rd
Mammoth Lakes, CA 93546
Madera County

GPS Coordinates: 37.63194444, -119.0863889

Nearby Water Temperatures

Deadman Creek, Mammoth Lakes, CA (11.5 mi)
Hot Creek, Mammoth Lakes, CA (12.3 mi)
Hot Creek, Mammoth Lakes, CA (12.9 mi)
Hot Creek, Mammoth Lakes, CA (14.9 mi)
Merced River, Yosemite Valley, CA (26.7 mi)
Tuolumne River, Groveland, CA (37 mi)
Tuolumne River, Groveland, CA (44.2 mi)
Tuolumne River, Groveland, CA (50 mi)
Cherry Creek, Groveland, CA (51 mi)
Tuolumne River, Groveland, CA (51.3 mi)
San Joaquin River, Friant, CA (56.8 mi)
Walker Lake, Walker Lake, NV (76.4 mi)
Walker Lake, Walker Lake, NV (79.8 mi)
Trout Creek, South Lake Tahoe, CA (101.1 mi)
Upper Truckee River, South Lake Tahoe, CA (101.8 mi)

Weather for Mammoth Lakes, California

Current Weather

41°F
Patchy sleet nearby
Patchy sleet nearby
33.8°F
41°F
69%
SW 13 mph
14.9 mph
33.8°F
31.7°F
0.01 in
89%
5 mi
1005 mbar
5.3

Five Day Weather Forecast

Patchy rain nearby
Tue
H: 43°F
L: 30°F
Light freezing rain
Wed
H: 43°F
L: 22°F
Moderate rain
Thu
H: 43°F
L: 26°F
Patchy rain nearby
Fri
H: 53°F
L: 26°F
Sunny
Sat
H: 58°F
L: 32°F

Air Quality

AQI: 1 - Good
PM2.5: 5.18 μg/m3
PM10: 10.58 μg/m3
Carbon Monoxide: 115.68 μg/m3
Nitrogen Dioxide: 1.28 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 94 μg/m3

Astronomical

Sunrise: 5:39 AM
Sun Transit: 12:53 AM
Sunset: 8:08 PM
Daylight: 14 hrs 29 mins
Moonrise: 4:06 PM
Moon Transit: 9:44 PM
Moonset: 2:52 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.9%

Best Times for Fishing or Hunting

Major Periods

4:54 AM - 7:24 AM
9:14 PM - 11:44 PM

Minor Periods

3:36 PM - 5:06 PM
2:22 AM - 3:52 AM

Action Rating: 2 out of 5

Lake Wind Advisory issued May 25 at 11:15PM PDT until May 26 at 5:00PM PDT by NWS Reno NV

Effective: Mon May 25, 2026, 11:15 PM
Expires: Tue May 26, 2026, 5:00 PM

* WHAT...Southwest winds 15 to 25 mph with gusts up to 40 mph for Topaz Lake, Bridgeport Reservoir, Mono Lake, and Crowley Lake. * WHERE...Mono County. * WHEN...From 8 AM to 5 PM PDT Tuesday. * IMPACTS...Small boats, kayaks and paddle boards will be prone to capsizing and should remain off lake waters until conditions improve.

Check lake conditions before heading out and be prepared for a sudden increase in winds and wave heights. Consider postponing boating activities on the lake until a day with less wind.
Tuesday, May 26, 2026

Weather Forecast

Patchy rain nearby
43.3°F
29.6°F
38.6°F
73%
0.12 in
89%
13%
14.3 mph
8.6


Air Quality

AQI: 1 - Good
PM2.5: 5.46 μg/m3
PM10: 10.65 μg/m3
Carbon Monoxide: 123.8 μg/m3
Nitrogen Dioxide: 1.88 μg/m3
Sulphur Dioxide: 1.01 μg/m3
Ozone: 94.88 μg/m3

Astronomical

Sunrise: 5:39 AM
Sun Transit: 12:53 AM
Sunset: 8:08 PM
Daylight: 14 hrs 29 mins
Moonrise: 4:06 PM
Moon Transit: 9:44 PM
Moonset: 2:52 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.9%

Best Times for Fishing or Hunting

Major Periods

4:54 AM - 7:24 AM
9:14 PM - 11:44 PM

Minor Periods

3:36 PM - 5:06 PM
2:22 AM - 3:52 AM

Action Rating: 2 out of 5

Wednesday, May 27, 2026

Weather Forecast

Light freezing rain
42.9°F
22.3°F
32.8°F
77%
0.31 in
87%
42%
8.9 mph
5.6


Air Quality

AQI: 1 - Good
PM2.5: 2.88 μg/m3
PM10: 5.81 μg/m3
Carbon Monoxide: 113.28 μg/m3
Nitrogen Dioxide: 1.19 μg/m3
Sulphur Dioxide: 0.7 μg/m3
Ozone: 92.84 μg/m3

Astronomical

Sunrise: 5:38 AM
Sun Transit: 12:53 AM
Sunset: 8:09 PM
Daylight: 14 hrs 31 mins
Moonrise: 5:07 PM
Moon Transit: 10:27 PM
Moonset: 3:15 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.7%

Best Times for Fishing or Hunting

Major Periods

5:36 AM - 8:06 AM
12:00 AM - 12:00 AM

Minor Periods

4:37 PM - 6:07 PM
2:45 AM - 4:15 AM

Action Rating: 3 out of 5

Thursday, May 28, 2026

Weather Forecast

Moderate rain
42.8°F
25.7°F
34.3°F
81%
0.28 in
89%
10%
6 mph
7.7


Air Quality

AQI: 1 - Good
PM2.5: 1.41 μg/m3
PM10: 1.97 μg/m3
Carbon Monoxide: 112.52 μg/m3
Nitrogen Dioxide: 1.41 μg/m3
Sulphur Dioxide: 0.73 μg/m3
Ozone: 81.8 μg/m3

Astronomical

Sunrise: 5:38 AM
Sun Transit: 12:53 AM
Sunset: 8:10 PM
Daylight: 14 hrs 32 mins
Moonrise: 6:09 PM
Moon Transit: 11:12 PM
Moonset: 3:40 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.7%

Best Times for Fishing or Hunting

Major Periods

6:19 AM - 8:49 AM
12:00 AM - 12:00 AM

Minor Periods

5:39 PM - 7:09 PM
3:10 AM - 4:40 AM

Action Rating: 2 out of 5

Friday, May 29, 2026

Weather Forecast

Patchy rain nearby
52.7°F
25.7°F
39.9°F
72%
0.03 in
89%
12%
6 mph
10.1


Air Quality

AQI: 1 - Good
PM2.5: 1.43 μg/m3
PM10: 2.07 μg/m3
Carbon Monoxide: 114.93 μg/m3
Nitrogen Dioxide: 1.85 μg/m3
Sulphur Dioxide: 0.69 μg/m3
Ozone: 92.8 μg/m3

Astronomical

Sunrise: 5:37 AM
Sun Transit: 12:53 AM
Sunset: 8:10 PM
Daylight: 14 hrs 33 mins
Moonrise: 7:10 PM
Moon Transit: 12:00 PM
Moonset: 4:10 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.4%

Best Times for Fishing or Hunting

Major Periods

7:05 AM - 9:35 AM
12:00 AM - 12:00 AM

Minor Periods

6:40 PM - 8:10 PM
3:40 AM - 5:10 AM

Action Rating: 4 out of 5

Saturday, May 30, 2026

Weather Forecast

Sunny
58°F
31.6°F
44.7°F
60%
0 in
0%
0%
11.9 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 4.71 μg/m3
PM10: 8.46 μg/m3
Carbon Monoxide: 120.25 μg/m3
Nitrogen Dioxide: 3.2 μg/m3
Sulphur Dioxide: 0.7 μg/m3
Ozone: 71.31 μg/m3

Astronomical

Sunrise: 5:37 AM
Sun Transit: 12:53 AM
Sunset: 8:11 PM
Daylight: 14 hrs 34 mins
Moonrise: 8:10 PM
Moon Transit: 12:00 AM
Moonset: 4:44 AM
Moon Phase: Full
Moon Illumination: 99.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:53 AM - 10:23 AM

Minor Periods

7:40 PM - 9:10 PM
4:14 AM - 5:44 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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