Bethel Island Area Delta Coves Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Bethel Island Area Delta Coves Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Bethel Island Area Delta Coves Lake today is 19.9°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 |
|---|---|---|---|
| SEP 25 | 20.8°C | 23.3°C | |
| SEP 26 | 21.2°C | 23.3°C | |
| SEP 27 | 21.1°C | 23.3°C | |
| SEP 28 | 21.6°C | 23.3°C | |
| SEP 29 | 21.4°C | 23.3°C | |
| SEP 30 | 20.7°C | 23.3°C | |
| OCT 1 | 20.6°C | 21.0°C | |
| OCT 2 | 20.0°C | 21.0°C | |
| OCT 3 | 21.0°C | 20.0°C | |
| OCT 4 | 21.0°C | 20.0°C | |
| OCT 5 | 21.0°C | 20.1°C | |
| OCT 6 | 21.0°C | 20.1°C | |
| OCT 7 | 21.0°C | 20.2°C | |
| OCT 8 | 21.0°C | 20.2°C | |
| OCT 9 | 21.0°C | 20.3°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 | 6°C | 9°C | 12°C |
| February | 6°C | 10°C | 14°C |
| March | 9°C | 15°C | 21°C |
| April | 14°C | 17°C | 21°C |
| May | 17°C | 21°C | 26°C |
| June | 21°C | 24°C | 27°C |
| July | 21°C | 25°C | 30°C |
| August | 21°C | 26°C | 32°C |
| September | 19°C | 23°C | 28°C |
| October | 17°C | 21°C | 25°C |
| November | 12°C | 16°C | 19°C |
| December | 8°C | 11°C | 14°C |
Bethel Island Area Delta Coves Lake: Water Temperature by Location
Bethel Island Area Delta Coves Lake: Weather Forecast
October 3
October 4
October 5
October 6
October 7
October 8
Location & Local Information
The coves and channels around Bethel Island in the Sacramento–San Joaquin Delta are shallow, tidal and often brackish, so temperatures can change with river flow, depth and weather. Typical seasonal surface temperatures run roughly 50–68°F (10–20°C) in spring, 65–80°F (18–27°C) in summer, 55–72°F (13–22°C) in autumn and about 48–60°F (9–16°C) in winter. Small, sun-warmed backwaters and shallow coves warm more quickly in summer and can reach the upper end of those ranges, while deeper navigation channels and tidal inflows tend to stay cooler. Short-term swings are common after rain or cold spells.
Swimming is not widely managed there in the way it is at a lifeguarded beach, so while people do swim in some quiet coves recreationally, it is generally done with caution rather than as a recommended public activity. Factors to consider are variable water quality from runoff and upstream sources, boat traffic and wakes, tidal currents, submerged debris and relatively cold temperatures outside midsummer. Where swimming is attempted, use of personal flotation devices, avoiding solitary swims, checking local water quality advisories and choosing sheltered spots away from boat lanes reduce risk; consult local authorities if in doubt.