San Jose — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in San Jose, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in San Jose today is 29.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating. 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 | 29.7°C | 23.4°C | |
| AUG 9 | 29.4°C | 23.4°C | |
| AUG 10 | 29.5°C | 23.4°C | |
| AUG 11 | 29.5°C | 23.4°C | |
| AUG 12 | 29.5°C | 23.4°C | |
| AUG 13 | 29.3°C | 23.4°C | |
| AUG 14 | 29.2°C | 23.4°C | |
| AUG 15 | 29.2°C | 23.4°C | |
| AUG 16 | 23.4°C | 28.8°C | |
| AUG 17 | 23.4°C | 28.5°C | |
| AUG 18 | 23.4°C | 28.2°C | |
| AUG 19 | 23.4°C | 28.0°C | |
| AUG 20 | 23.4°C | 27.7°C | |
| AUG 21 | 23.4°C | 27.4°C | |
| AUG 22 | 23.4°C | 27.1°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 | 15°C |
| March | 3°C | 12°C | 20°C |
| April | 5°C | 12°C | 19°C |
| May | 8°C | 16°C | 25°C |
| June | 14°C | 20°C | 26°C |
| July | 17°C | 23°C | 29°C |
| August | 17°C | 23°C | 30°C |
| September | 11°C | 17°C | 23°C |
| October | 8°C | 15°C | 22°C |
| November | 3°C | 11°C | 19°C |
| December | 8°C | 11°C | 15°C |
San Jose: Weather Forecast
August 16
August 17
August 18
August 19
August 20
Location & Local Information
San Jose, California, is home to several creeks, rivers, and reservoirs, providing a variety of outdoor recreational opportunities. However, the water temperatures in the city’s waterways are generally not ideal for swimming, especially in the smaller creeks and rivers. The Guadalupe River, which runs through parts of San Jose, typically has water temperatures ranging from 55°F (13°C) to 65°F (18°C) throughout the year. These cooler temperatures make it more suitable for activities like fishing, kayaking, and tubing rather than swimming, as the water can feel too cold for a comfortable dip, particularly in the cooler months.
In addition to the rivers, San Jose offers access to reservoirs like Almaden Lake and Anderson Reservoir, which are often popular for recreational use. Water temperatures in these reservoirs can be warmer, especially during the summer, reaching around 70°F (21°C) to 80°F (27°C). These warmer temperatures make them more appealing for swimming, boating, and picnicking by the water. However, public access to some of these reservoirs may be restricted, and it’s important to check the specific regulations for each location.
During the summer months, when San Jose’s air temperatures often exceed 90°F (32°C), swimming in the warmer reservoirs can provide a much-needed escape from the heat. Public pools in San Jose also offer a more controlled environment for swimming, maintaining water temperatures between 78°F (26°C) and 82°F (28°C), which is comfortable for year-round swimming. Whether in local pools or reservoirs, San Jose provides a variety of water-based activities, though natural waterways tend to offer more scenic views than ideal conditions for swimming.