San Joaquin River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the San Joaquin River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the San Joaquin River today is 19.4°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 |
|---|---|---|---|
| OCT 12 | 23.2°C | 16.0°C | |
| OCT 13 | 23.1°C | 16.0°C | |
| OCT 14 | 19.2°C | 16.0°C | |
| OCT 15 | 19.6°C | 16.0°C | |
| OCT 16 | 19.4°C | 16.0°C | |
| OCT 17 | 20.4°C | 16.0°C | |
| OCT 18 | 20.8°C | 16.0°C | |
| OCT 19 | 21.0°C | 16.0°C | |
| OCT 20 | 16.0°C | 19.2°C | |
| OCT 21 | 16.0°C | 19.1°C | |
| OCT 22 | 16.0°C | 18.9°C | |
| OCT 23 | 16.0°C | 18.7°C | |
| OCT 24 | 16.0°C | 18.6°C | |
| OCT 25 | 16.0°C | 18.4°C | |
| OCT 26 | 16.0°C | 18.2°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 | 8°C | 13°C |
| February | 3°C | 9°C | 14°C |
| March | 3°C | 11°C | 19°C |
| April | 5°C | 12°C | 19°C |
| May | 8°C | 15°C | 23°C |
| June | 14°C | 20°C | 26°C |
| July | 17°C | 22°C | 28°C |
| August | 17°C | 23°C | 29°C |
| September | 11°C | 19°C | 26°C |
| October | 8°C | 16°C | 24°C |
| November | 3°C | 11°C | 19°C |
| December | 8°C | 6°C | 13°C |
San Joaquin River: Water Temperature by Location
San Joaquin River: Weather Forecast
October 20
October 21
October 22
October 23
October 24
Location & Local Information
Source Thousand Island Lake
• location Ansel Adams Wilderness, Sierra Nevada
Mouth Suisun Bay
• location Antioch, Contra Costa/Solano Counties
Length 366 mi (589 km)
The San Joaquin River, winding through California’s Central Valley, is a significant waterway with a diverse landscape ranging from mountain-fed streams to broad, slow-moving sections. The river’s water temperature varies depending on the season and location. In the cooler months, temperatures often stay between 45 and 55°F (7 to 13°C), particularly in higher elevation areas or near the river’s headwaters. During summer, downstream stretches can warm to around 70°F (21°C), especially in the lower valley regions, offering more comfortable conditions for recreational activities.
Swimming opportunities in the San Joaquin River depend on the specific area. Calm stretches near parks and recreation zones are more suitable for wading or swimming, particularly during the warmer months. However, parts of the river can have strong currents or fluctuating water levels due to agricultural water management and dam releases. These factors make it essential to choose swimming spots carefully and prioritize safety. For those seeking a blend of relaxation and adventure, the river also offers activities like fishing, kayaking, and enjoying the natural beauty of California’s landscapes.