Yosemite Valley — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Yosemite Valley, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Yosemite Valley today is 23.8°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 9 | 24.7°C | 20.6°C | |
| AUG 10 | 24.9°C | 20.6°C | |
| AUG 11 | 25.0°C | 20.6°C | |
| AUG 12 | 25.2°C | 20.6°C | |
| AUG 13 | 25.2°C | 20.6°C | |
| AUG 14 | 25.1°C | 20.6°C | |
| AUG 15 | 25.2°C | 20.6°C | |
| AUG 16 | 23.8°C | 20.6°C | |
| AUG 17 | 20.6°C | 23.6°C | |
| AUG 18 | 20.6°C | 23.5°C | |
| AUG 19 | 20.6°C | 23.3°C | |
| AUG 20 | 20.6°C | 23.2°C | |
| AUG 21 | 20.6°C | 23.0°C | |
| AUG 22 | 20.6°C | 22.8°C | |
| AUG 23 | 20.6°C | 22.7°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 | 6°C | 10°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 | 16°C | 20°C | 25°C |
| August | 16°C | 21°C | 26°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 | 12°C |
Yosemite Valley: Weather Forecast
August 16
August 17
August 18
August 19
August 20
Location & Local Information
Yosemite Valley, located in Yosemite National Park, is home to the Merced River, a popular waterway for visitors to explore. The water temperature in the Merced River varies depending on the season, with the warmest temperatures occurring during the summer months. From late spring to early fall, the water temperature generally ranges from 60°F (15°C) to 70°F (21°C), which can feel refreshing on hot days, especially given the warm temperatures in the valley, which can exceed 90°F (32°C). These temperatures make the river a suitable spot for short swims, wading, or cooling off after a hike, though the water can still feel cool compared to warmer lakes or pools.
In the winter months, the temperature of the Merced River drops significantly, typically ranging from 40°F (4°C) to 50°F (10°C), making swimming very uncomfortable and unsafe. The water is often quite cold, and the current can be stronger during this time, which increases the risk for swimmers. As a result, swimming in the river is not recommended during the colder months, and other activities such as cross-country skiing, snowshoeing, and winter hiking are more popular during this time of year.
The Merced River offers a unique setting for water-based activities, but visitors should be cautious of the water’s chill and swift currents in certain sections. For those seeking a more controlled swimming environment, nearby lakes, like Mirror Lake, offer calmer waters with warmer temperatures during the summer, though the river itself remains an iconic feature for those looking to experience Yosemite's natural beauty up close. The river is also popular for other activities such as rafting and kayaking, particularly in areas where the current is not as strong.