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 27.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. 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 | 27.4°C | 22.9°C | |
| AUG 9 | 27.4°C | 22.9°C | |
| AUG 10 | 28.8°C | 22.9°C | |
| AUG 11 | 28.9°C | 22.9°C | |
| AUG 12 | 28.9°C | 22.9°C | |
| AUG 13 | 28.7°C | 22.9°C | |
| AUG 14 | 28.6°C | 22.9°C | |
| AUG 15 | 28.7°C | 22.9°C | |
| AUG 16 | 22.9°C | 27.4°C | |
| AUG 17 | 22.9°C | 27.1°C | |
| AUG 18 | 22.9°C | 26.9°C | |
| AUG 19 | 22.9°C | 26.7°C | |
| AUG 20 | 22.9°C | 26.4°C | |
| AUG 21 | 22.9°C | 26.2°C | |
| AUG 22 | 22.9°C | 26.0°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
August 16
August 17
August 18
August 19
August 20
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.