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

Current Water Temperature

55.8°F

Measurement Time: Friday, September 18, 2026, 1:00 PM 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

53°F
Clear
Clear
52%
NNE 5 mph
36°F

Weather Forecast

Mostly Clear
Tonight
37°F - Mostly Clear
Sunny then Patchy Smoke
Saturday
72°F - Sunny then Patchy Smoke
Patchy Smoke then Partly Cloudy
Saturday Night
41°F - Patchy Smoke then Partly Cloudy
Partly Sunny
Sunday
70°F - Partly Sunny
Mostly Cloudy
Sunday Night
43°F - Mostly Cloudy
Mostly Sunny
Monday
67°F - Mostly Sunny
Partly Cloudy
Monday Night
40°F - Partly Cloudy
Sunny
Tuesday
69°F - Sunny
Mostly Clear
Tuesday Night
41°F - Mostly Clear
Sunny
Wednesday
72°F - Sunny
Mostly Clear
Wednesday Night
42°F - Mostly Clear
Mostly Sunny
Thursday
72°F - Mostly Sunny
Partly Cloudy
Thursday Night
43°F - Partly Cloudy
Mostly Sunny
Friday
69°F - Mostly Sunny

Astronomical

Sunrise: 6:41 AM
Sun Transit: 12:50 AM
Sunset: 6:59 PM
Daylight: 12 hrs 18 mins
Moonrise: 2:27 PM
Moon Transit: 6:57 PM
Moonset: 11:30 PM
Moon Phase: First Quarter
Moon Illumination: 43.0%

Best Times for Fishing or Hunting

Major Periods

2:00 AM - 4:30 AM
6:27 PM - 8:57 PM

Minor Periods

12:00 AM - 12:00 AM
1:57 PM - 3:27 PM

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: 6:41 AM
Sun Transit: 12:50 AM
Sunset: 6:59 PM
Daylight: 12 hrs 18 mins
Moonrise: 2:27 PM
Moon Transit: 6:57 PM
Moonset: 11:30 PM
Moon Phase: First Quarter
Moon Illumination: 43.0%

Best Times for Fishing or Hunting

Major Periods

2:00 AM - 4:30 AM
6:27 PM - 8:57 PM

Minor Periods

12:00 AM - 12:00 AM
1:57 PM - 3:27 PM

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: 6:42 AM
Sun Transit: 12:50 AM
Sunset: 6:58 PM
Daylight: 12 hrs 16 mins
Moonrise: 3:14 PM
Moon Transit: 7:48 PM
Moonset: 12:30 AM
Moon Phase: First Quarter
Moon Illumination: 54.3%

Best Times for Fishing or Hunting

Major Periods

2:52 AM - 5:22 AM
7:18 PM - 9:48 PM

Minor Periods

2:44 PM - 4:14 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: 6:42 AM
Sun Transit: 12:50 AM
Sunset: 6:58 PM
Daylight: 12 hrs 16 mins
Moonrise: 3:14 PM
Moon Transit: 7:48 PM
Moonset: 12:30 AM
Moon Phase: First Quarter
Moon Illumination: 54.3%

Best Times for Fishing or Hunting

Major Periods

2:52 AM - 5:22 AM
7:18 PM - 9:48 PM

Minor Periods

2:44 PM - 4:14 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: 6:43 AM
Sun Transit: 12:49 AM
Sunset: 6:56 PM
Daylight: 12 hrs 13 mins
Moonrise: 3:55 PM
Moon Transit: 8:38 PM
Moonset: 12:27 AM
Moon Phase: First Quarter
Moon Illumination: 65.4%

Best Times for Fishing or Hunting

Major Periods

3:43 AM - 6:13 AM
8:08 PM - 10:38 PM

Minor Periods

3:25 PM - 4:55 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: 6:43 AM
Sun Transit: 12:49 AM
Sunset: 6:56 PM
Daylight: 12 hrs 13 mins
Moonrise: 3:55 PM
Moon Transit: 8:38 PM
Moonset: 12:27 AM
Moon Phase: First Quarter
Moon Illumination: 65.4%

Best Times for Fishing or Hunting

Major Periods

3:43 AM - 6:13 AM
8:08 PM - 10:38 PM

Minor Periods

3:25 PM - 4:55 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: 6:44 AM
Sun Transit: 12:49 AM
Sunset: 6:55 PM
Daylight: 12 hrs 11 mins
Moonrise: 4:30 PM
Moon Transit: 9:26 PM
Moonset: 1:27 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 75.7%

Best Times for Fishing or Hunting

Major Periods

4:32 AM - 7:02 AM
8:56 PM - 11:26 PM

Minor Periods

4:00 PM - 5:30 PM
12:57 AM - 2:27 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: 6:44 AM
Sun Transit: 12:49 AM
Sunset: 6:55 PM
Daylight: 12 hrs 11 mins
Moonrise: 4:30 PM
Moon Transit: 9:26 PM
Moonset: 1:27 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 75.7%

Best Times for Fishing or Hunting

Major Periods

4:32 AM - 7:02 AM
8:56 PM - 11:26 PM

Minor Periods

4:00 PM - 5:30 PM
12:57 AM - 2:27 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: 6:45 AM
Sun Transit: 12:48 AM
Sunset: 6:53 PM
Daylight: 12 hrs 9 mins
Moonrise: 4:59 PM
Moon Transit: 10:12 PM
Moonset: 2:30 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 84.7%

Best Times for Fishing or Hunting

Major Periods

5:19 AM - 7:49 AM
12:00 AM - 12:00 AM

Minor Periods

4:29 PM - 5:59 PM
2:00 AM - 3:30 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: 6:45 AM
Sun Transit: 12:48 AM
Sunset: 6:53 PM
Daylight: 12 hrs 9 mins
Moonrise: 4:59 PM
Moon Transit: 10:12 PM
Moonset: 2:30 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 84.7%

Best Times for Fishing or Hunting

Major Periods

5:19 AM - 7:49 AM
12:00 AM - 12:00 AM

Minor Periods

4:29 PM - 5:59 PM
2:00 AM - 3:30 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: 6:45 AM
Sun Transit: 12:48 AM
Sunset: 6:52 PM
Daylight: 12 hrs 6 mins
Moonrise: 5:26 PM
Moon Transit: 10:57 PM
Moonset: 3:33 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.9%

Best Times for Fishing or Hunting

Major Periods

6:05 AM - 8:35 AM
12:00 AM - 12:00 AM

Minor Periods

4:56 PM - 6:26 PM
3:03 AM - 4:33 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: 6:45 AM
Sun Transit: 12:48 AM
Sunset: 6:52 PM
Daylight: 12 hrs 6 mins
Moonrise: 5:26 PM
Moon Transit: 10:57 PM
Moonset: 3:33 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.9%

Best Times for Fishing or Hunting

Major Periods

6:05 AM - 8:35 AM
12:00 AM - 12:00 AM

Minor Periods

4:56 PM - 6:26 PM
3:03 AM - 4:33 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: 6:46 AM
Sun Transit: 12:48 AM
Sunset: 6:50 PM
Daylight: 12 hrs 4 mins
Moonrise: 5:51 PM
Moon Transit: 11:41 PM
Moonset: 4:37 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.0%

Best Times for Fishing or Hunting

Major Periods

6:49 AM - 9:19 AM
12:00 AM - 12:00 AM

Minor Periods

5:21 PM - 6:51 PM
4:07 AM - 5:37 AM

Action Rating: 4 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: 6:46 AM
Sun Transit: 12:48 AM
Sunset: 6:50 PM
Daylight: 12 hrs 4 mins
Moonrise: 5:51 PM
Moon Transit: 11:41 PM
Moonset: 4:37 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.0%

Best Times for Fishing or Hunting

Major Periods

6:49 AM - 9:19 AM
12:00 AM - 12:00 AM

Minor Periods

5:21 PM - 6:51 PM
4:07 AM - 5:37 AM

Action Rating: 4 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: 6:47 AM
Sun Transit: 12:47 AM
Sunset: 6:49 PM
Daylight: 12 hrs 1 mins
Moonrise: 6:15 PM
Moon Transit: 12:00 AM
Moonset: 5:41 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

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

Minor Periods

5:45 PM - 7:15 PM
5:11 AM - 6:41 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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