Lake Sonoma — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Sonoma, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Sonoma today is 22.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 |
|---|---|---|---|
| JUN 3 | 22.7°C | 21.7°C | |
| JUN 4 | 22.0°C | 21.7°C | |
| JUN 5 | 22.3°C | 21.7°C | |
| JUN 6 | 22.1°C | 21.7°C | |
| JUN 7 | 22.8°C | 21.7°C | |
| JUN 8 | 23.1°C | 21.7°C | |
| JUN 11 | 21.7°C | 22.7°C | |
| JUN 12 | 21.7°C | 22.7°C | |
| JUN 13 | 21.7°C | 22.6°C | |
| JUN 14 | 21.7°C | 22.6°C | |
| JUN 15 | 21.7°C | 22.5°C | |
| JUN 16 | 21.7°C | 22.5°C | |
| JUN 17 | 21.7°C | 22.4°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 | 8°C | 11°C | 13°C |
| February | 5°C | 9°C | 13°C |
| March | 6°C | 11°C | 17°C |
| April | 12°C | 17°C | 21°C |
| May | 15°C | 20°C | 24°C |
| June | 19°C | 22°C | 24°C |
| July | 21°C | 24°C | 27°C |
| August | 22°C | 24°C | 27°C |
| September | 18°C | 21°C | 23°C |
| October | 17°C | 20°C | 23°C |
| November | 13°C | 17°C | 20°C |
| December | 10°C | 13°C | 16°C |
Lake Sonoma: Water Temperature by Location
Lake Sonoma: Weather Forecast
June 9
June 10
June 11
June 12
Location & Local Information
Lake Sonoma is a deep, managed reservoir, so its water temperatures vary with season and depth. Surface temperatures in summer typically run from about 60–75°F (15–24°C), with the warmest readings in late summer near the surface. Spring and fall surface temperatures are commonly in the 50–65°F range (10–18°C), while winter surface temperatures often drop to roughly 45–55°F (7–13°C). Because the lake is relatively deep, colder water persists below the thermocline year‑round, so swimmers and boaters who enter deeper water can encounter much colder temperatures than surface readings indicate.
Swimming at Lake Sonoma is limited and effectively controlled for safety and resource reasons. Recreational swimming is generally allowed only in designated areas and during posted hours, but there are few or no lifeguards and significant restrictions related to water quality, boat traffic, and reservoir operations. Management limits access in places to protect drinking‑water infrastructure and to reduce risks from cold‑water shock, sudden changes in water level, and motorized boats. Visitors should follow on‑site signage and park rules, be aware that even pleasant summer surface temperatures can hide cold depths, and treat open‑water swimming there as a potentially hazardous activity unless specifically permitted and suitably supervised.