Merced River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Merced River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Merced River today is 11.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 50°F (10°C) to 54°F (12°C). The water is slightly warmer, but still cool for most people. Swimming in such conditions is possible, but for most people, the time spent in the water should be limited to avoid hypothermia. Even experienced swimmers may feel discomfort if they stay in the water for too long. To improve comfort and safety, a wetsuit can be used. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| SEP 25 | 16.0°C | 16.4°C | |
| SEP 26 | 16.5°C | 16.4°C | |
| SEP 27 | 16.5°C | 16.4°C | |
| SEP 28 | 15.4°C | 16.4°C | |
| SEP 29 | 15.3°C | 16.4°C | |
| SEP 30 | 15.0°C | 16.4°C | |
| OCT 1 | 11.3°C | 12.5°C | |
| OCT 2 | 11.4°C | 12.5°C | |
| OCT 3 | 12.5°C | 11.6°C | |
| OCT 4 | 12.5°C | 11.7°C | |
| OCT 5 | 12.5°C | 11.7°C | |
| OCT 6 | 12.5°C | 11.8°C | |
| OCT 7 | 12.5°C | 11.8°C | |
| OCT 8 | 12.5°C | 11.9°C | |
| OCT 9 | 12.5°C | 11.9°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 3°C | 6°C | 10°C |
| February | 3°C | 5°C | 9°C |
| March | 3°C | 7°C | 11°C |
| April | 5°C | 10°C | 16°C |
| May | 8°C | 13°C | 21°C |
| June | 12°C | 17°C | 22°C |
| July | 17°C | 21°C | 25°C |
| August | 17°C | 22°C | 27°C |
| September | 11°C | 16°C | 22°C |
| October | 8°C | 13°C | 17°C |
| November | 3°C | 8°C | 16°C |
| December | 6°C | 9°C | 11°C |
Merced River: Water Temperature by Location
Merced River: Weather Forecast
October 3
October 4
October 5
October 6
October 7
October 8
Location & Local Information
Source Confluence of Merced Peak and Triple Peak Forks
• location Yosemite National Park, Madera County
• elevation 8,017 ft (2,444 m)
Mouth San Joaquin River
• location Hills Ferry, Stanislaus County
• elevation 56 ft (17 m)
Length 145 mi (233 km)
The Merced River in California is a striking natural feature, particularly as it flows through Yosemite National Park and its surrounding areas. Water temperatures in the river fluctuate significantly depending on the season and elevation. During the spring and early summer, the river is fed by snowmelt, making the water icy cold, ranging from 45°F to 55°F (7°C to 13°C). As summer progresses, lower-elevation sections of the river can warm up to more comfortable levels, typically between 60°F and 75°F (16°C to 24°C), especially in calmer stretches.
Swimming in the Merced River is a popular activity during the warmer months, particularly in calmer areas such as the sandy beaches near Yosemite Valley or further downstream in less turbulent stretches. The river’s clarity and scenic surroundings make it an inviting spot for wading, floating, and swimming, though visitors should always exercise caution due to varying currents and water levels. In spring, the river's flow can be quite swift due to snowmelt, making certain sections unsafe for swimming.
For those looking for additional water recreation, nearby lakes and reservoirs, such as Lake McClure, offer opportunities for swimming, boating, and fishing. The Merced River and its surrounding waterways provide a diverse range of options for enjoying nature and cooling off in California's warmer climate.