Big Bear Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Big Bear Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Big Bear Lake today is 17°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 | 16.5°C | 19.5°C | |
| JUN 4 | 16.2°C | 19.5°C | |
| JUN 5 | 16.2°C | 19.5°C | |
| JUN 6 | 16.2°C | 19.5°C | |
| JUN 7 | 16.8°C | 19.5°C | |
| JUN 8 | 16.8°C | 19.5°C | |
| JUN 10 | 17.0°C | 19.5°C | |
| JUN 11 | 19.5°C | 17.1°C | |
| JUN 12 | 19.5°C | 17.3°C | |
| JUN 13 | 19.5°C | 17.4°C | |
| JUN 14 | 19.5°C | 17.5°C | |
| JUN 15 | 19.5°C | 17.6°C | |
| JUN 16 | 19.5°C | 17.8°C | |
| JUN 17 | 19.5°C | 17.9°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 | 12°C |
| February | 4°C | 9°C | 14°C |
| March | 7°C | 10°C | 13°C |
| April | 9°C | 14°C | 18°C |
| May | 11°C | 16°C | 20°C |
| June | 14°C | 20°C | 25°C |
| July | 16°C | 21°C | 26°C |
| August | 20°C | 23°C | 26°C |
| September | 19°C | 22°C | 25°C |
| October | 16°C | 20°C | 23°C |
| November | 8°C | 13°C | 18°C |
| December | 6°C | 10°C | 14°C |
Big Bear Lake: Water Temperature by Location
Big Bear Lake: Weather Forecast
June 9
June 10
June 11
June 12
Location & Local Information
Big Bear Lake is an alpine reservoir in Southern California whose water stays relatively cool because of elevation and mountain inflow. Typical surface temperatures in winter often hover around freezing to the mid-40s Fahrenheit (about 1–7 °C). In spring and fall the lake commonly ranges from the mid-40s to around 60 °F (7–15 °C). During the warmest summer weeks shallow bays and sun-warmed surfaces can reach roughly 60–75 °F (16–24 °C), though deeper or shaded areas remain noticeably cooler. Temperatures vary by depth, weather, and time of day, so conditions can change quickly from one part of the lake to another.
Swimming is permitted in public beaches and park areas around Big Bear Lake and it is a popular summer activity, but the lake’s cool temperatures and mountain setting influence how comfortable and safe swimming feels. Cold water can lead to rapid cooling and increased risk of hypothermia, and in winter portions of the lake may ice over or be unsafe. Many swim spots have limited or no lifeguard coverage and there is boat traffic in open areas, so swimmers typically use designated beach zones and exercise caution. Overall, swimming is allowed but conditions and safety considerations depend strongly on season and location.