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

Current Water Temperature

35.8°F

Measurement Time: Tuesday, March 31, 2026, 2:00 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

32.4°F
Partly Cloudy
Partly Cloudy
25.3°F
32.4°F
91%
SW 6.3 mph
7.3 mph
25.3°F
30.6°F
0 in
51%
1 mi
1010 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Tue
H: 41°F
L: 29°F
Moderate or heavy snow showers
Wed
H: 37°F
L: 31°F
Moderate or heavy snow showers
Thu
H: 41°F
L: 24°F
Sunny
Fri
H: 44°F
L: 17°F
Partly Cloudy
Sat
H: 52°F
L: 28°F

Air Quality

AQI: 1 - Good
PM2.5: 0.78 μg/m3
PM10: 0.78 μg/m3
Carbon Monoxide: 127.68 μg/m3
Nitrogen Dioxide: 1.18 μg/m3
Sulphur Dioxide: 0.68 μg/m3
Ozone: 106 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 1:00 PM
Sunset: 7:18 PM
Daylight: 12 hrs 35 mins
Moonrise: 6:18 PM
Moon Transit: 12:00 AM
Moonset: 5:56 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:32 AM - 10:02 AM

Minor Periods

5:48 PM - 7:18 PM
5:26 AM - 6:56 AM

Action Rating: 4 out of 5

Winter Weather Advisory issued March 31 at 10:37AM PDT until April 1 at 5:00AM PDT by NWS Reno NV

Effective: Tue March 31, 2026, 10:37 AM
Expires: Wed April 1, 2026, 5:00 AM

* WHAT...Snow. Snow accumulations of 6 to 12 inches above 8000 ft, with locally up to 14 inches. Snow accumulations of 1 to 2 inches along and west of US-395. Winds gusting as high as 60 to 70 mph along ridges. * WHERE...Mono County. * WHEN...Until 5 AM PDT Wednesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Tuesday evening commute. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Strong and gusty winds are expected to intensify on Wednesday afternoon and evening.

Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.


High Wind Warning issued March 31 at 10:35AM PDT until April 2 at 11:00AM PDT by NWS Reno NV

Effective: Tue March 31, 2026, 10:35 AM
Expires: Wed April 1, 2026, 5:00 PM

* WHAT...Southwest winds of 35 to 45 mph with gusts up to 60 mph. Wind prone canyons along US-395 may see gusts up to 80 mph. Ridgetops gusting over 100 mph. * WHERE...Mono County. * WHEN...From 2 PM Wednesday to 11 AM PDT Thursday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles.

Now is the time to secure loose outdoor items such as patio furniture, holiday decorations, and trash cans before winds increase which could blow these items away. The best thing to do is prepare ahead of time by making sure you have extra food and water on hand, flashlights with spare batteries and/or candles in the event of a power outage.
Tuesday, March 31, 2026

Weather Forecast

Patchy rain nearby
40.8°F
28.9°F
34.9°F
78%
0.12 in
85%
2%
12.3 mph
0.9


Air Quality

AQI: 1 - Good
PM2.5: 7.89 μg/m3
PM10: 11.11 μg/m3
Carbon Monoxide: 122.52 μg/m3
Nitrogen Dioxide: 1.57 μg/m3
Sulphur Dioxide: 1.17 μg/m3
Ozone: 105.08 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 1:00 PM
Sunset: 7:18 PM
Daylight: 12 hrs 35 mins
Moonrise: 6:18 PM
Moon Transit: 12:00 AM
Moonset: 5:56 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
7:32 AM - 10:02 AM

Minor Periods

5:48 PM - 7:18 PM
5:26 AM - 6:56 AM

Action Rating: 4 out of 5

Wednesday, April 1, 2026

Weather Forecast

Moderate or heavy snow showers
36.9°F
30.9°F
33.3°F
87%
0.08 in
66%
7%
14.8 mph
1.8


Air Quality

AQI: 1 - Good
PM2.5: 1.79 μg/m3
PM10: 2.31 μg/m3
Carbon Monoxide: 128.68 μg/m3
Nitrogen Dioxide: 1.27 μg/m3
Sulphur Dioxide: 0.8 μg/m3
Ozone: 107 μg/m3

Astronomical

Sunrise: 6:42 AM
Sun Transit: 1:00 PM
Sunset: 7:19 PM
Daylight: 12 hrs 37 mins
Moonrise: 7:20 PM
Moon Transit: 12:23 AM
Moonset: 6:19 AM
Moon Phase: Full
Moon Illumination: 99.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
8:14 AM - 10:44 AM

Minor Periods

6:50 PM - 8:20 PM
5:49 AM - 7:19 AM

Action Rating: 4 out of 5

Thursday, April 2, 2026

Weather Forecast

Moderate or heavy snow showers
41.2°F
24°F
32.1°F
66%
0.66 in
60%
28%
17.2 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 2.29 μg/m3
PM10: 3.24 μg/m3
Carbon Monoxide: 128.92 μg/m3
Nitrogen Dioxide: 1.02 μg/m3
Sulphur Dioxide: 0.79 μg/m3
Ozone: 106.72 μg/m3

Astronomical

Sunrise: 6:40 AM
Sun Transit: 12:00 AM
Sunset: 7:20 PM
Daylight: 12 hrs 40 mins
Moonrise: 8:22 PM
Moon Transit: 1:05 AM
Moonset: 6:43 AM
Moon Phase: Full
Moon Illumination: 99.5%

Best Times for Fishing or Hunting

Major Periods

12:35 AM - 3:05 AM
8:57 AM - 11:27 AM

Minor Periods

7:52 PM - 9:22 PM
6:13 AM - 7:43 AM

Action Rating: 4 out of 5

Friday, April 3, 2026

Weather Forecast

Sunny
44.1°F
16.7°F
29.5°F
45%
0 in
0%
0%
7.6 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 2.72 μg/m3
PM10: 3.55 μg/m3
Carbon Monoxide: 134.9 μg/m3
Nitrogen Dioxide: 1.41 μg/m3
Sulphur Dioxide: 0.93 μg/m3
Ozone: 106.04 μg/m3

Astronomical

Sunrise: 6:39 AM
Sun Transit: 12:00 AM
Sunset: 7:21 PM
Daylight: 12 hrs 42 mins
Moonrise: 9:24 PM
Moon Transit: 1:48 AM
Moonset: 7:07 AM
Moon Phase: Full
Moon Illumination: 96.6%

Best Times for Fishing or Hunting

Major Periods

1:18 AM - 3:48 AM
9:40 AM - 12:10 AM

Minor Periods

8:54 PM - 10:24 PM
6:37 AM - 8:07 AM

Action Rating: 4 out of 5

Saturday, April 4, 2026

Weather Forecast

Partly Cloudy
52°F
28.3°F
39°F
34%
0 in
0%
0%
4.7 mph
2.1


Air Quality

AQI: 1 - Good
PM2.5: 1.96 μg/m3
PM10: 2.55 μg/m3
Carbon Monoxide: 139.04 μg/m3
Nitrogen Dioxide: 2.24 μg/m3
Sulphur Dioxide: 1.09 μg/m3
Ozone: 98.15 μg/m3

Astronomical

Sunrise: 6:37 AM
Sun Transit: 12:00 AM
Sunset: 7:22 PM
Daylight: 12 hrs 45 mins
Moonrise: 10:27 PM
Moon Transit: 2:33 AM
Moonset: 7:35 AM
Moon Phase: Full
Moon Illumination: 91.3%

Best Times for Fishing or Hunting

Major Periods

2:03 AM - 4:33 AM
10:26 AM - 12:56 AM

Minor Periods

9:57 PM - 11:27 PM
7:05 AM - 8:35 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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