Current Water Temperature
at Tuolumne River Below Early Intake Near Mather CA

Yesterday's water temperature for Tuolumne River Below Early Intake Near Mather CA was between 43.34°F and 49.28°F with an average of 43.70°F. This is cooler than the historical average for June.

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Water temperature by month

Month Average Temperature (°F) Average Temperature (°C)
January 43.83 6.57
February 46.19 7.88
March 47.85 8.81
April 51.70 10.95
May 53.23 11.79
June 61.44 16.35
July 67.42 19.68
August 67.54 19.75
September 62.64 17.02
October 55.64 13.14
November 48.33 9.07
December 43.31 6.29

These monthly temperatures are averages of the available data from the following years: 2022, 2021, 2020, 2019, 2018.

Site location

About this data

This data was sourced from the US Geological Survey, "the science arm of the Department of the Interior bringing an array of earth, water, biological, and mapping data and expertise to bear in support of decision-making on environmental, resource, and public safety issues."

  • Agency: USGS
  • Site Number: 11276900
  • Site Name: Tuolumne R Bl Early Intake Nr Mather Ca
  • Hydrologic Unit Code: 18040009

Is it warm enough for swimming?

Water temperatures can vary significantly based on the location and time of year. Generally, swimming is considered comfortable in water temperatures between 78°F (25°C) and 82°F (28°C). Cooler temperatures can be refreshing, but if the water temperature drops below 70°F (21°C), prolonged exposure can be uncomfortable without a wetsuit.

Should you wear a wetsuit?

Wetsuits provide insulation and buoyancy, making them ideal for swimming in cooler waters. Here are some general guidelines for wetsuit use:

  • 70°F (21°C) and above: No wetsuit needed for most people.
  • 65°F - 70°F (18°C - 21°C): A thin wetsuit (2mm - 3mm) is recommended.
  • 60°F - 65°F (15°C - 18°C): A thicker wetsuit (4mm - 5mm) is recommended.
  • Below 60°F (15°C): A full wetsuit with a hood, gloves, and booties is recommended for safety and comfort.