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 24.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. 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 |
|---|---|---|---|
| AUG 8 | 24.4°C | 21.6°C | |
| AUG 9 | 26.1°C | 21.6°C | |
| AUG 10 | 26.2°C | 21.6°C | |
| AUG 11 | 24.8°C | 21.6°C | |
| AUG 12 | 24.8°C | 21.6°C | |
| AUG 13 | 25.0°C | 21.6°C | |
| AUG 14 | 24.9°C | 21.6°C | |
| AUG 15 | 24.9°C | 21.6°C | |
| AUG 16 | 21.6°C | 24.7°C | |
| AUG 17 | 21.6°C | 24.6°C | |
| AUG 18 | 21.6°C | 24.4°C | |
| AUG 19 | 21.6°C | 24.2°C | |
| AUG 20 | 21.6°C | 24.1°C | |
| AUG 21 | 21.6°C | 23.9°C | |
| AUG 22 | 21.6°C | 23.7°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 | 18°C | 19°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
August 16
August 17
August 18
August 19
August 20
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.