Lake Gregory — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Gregory, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Gregory today is 19.4°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 |
|---|---|---|---|
| OCT 5 | 19.4°C | 21.0°C | |
| OCT 6 | 19.2°C | 21.0°C | |
| OCT 7 | 19.2°C | 21.0°C | |
| OCT 8 | 19.0°C | 21.0°C | |
| OCT 9 | 18.9°C | 21.0°C | |
| OCT 10 | 18.8°C | 21.0°C | |
| OCT 11 | 18.7°C | 21.0°C | |
| OCT 12 | 19.4°C | 21.0°C | |
| OCT 13 | 21.0°C | 19.5°C | |
| OCT 14 | 21.0°C | 19.6°C | |
| OCT 15 | 21.0°C | 19.6°C | |
| OCT 16 | 21.0°C | 19.7°C | |
| OCT 17 | 21.0°C | 19.8°C | |
| OCT 18 | 21.0°C | 19.9°C | |
| OCT 19 | 21.0°C | 20.0°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 | 4°C | 7°C | 10°C |
| February | 3°C | 7°C | 12°C |
| March | 5°C | 10°C | 16°C |
| April | 11°C | 15°C | 19°C |
| May | 15°C | 21°C | 26°C |
| June | 19°C | 23°C | 26°C |
| July | 21°C | 27°C | 32°C |
| August | 23°C | 27°C | 31°C |
| September | 22°C | 24°C | 27°C |
| October | 18°C | 21°C | 24°C |
| November | 11°C | 16°C | 20°C |
| December | 8°C | 10°C | 13°C |
Lake Gregory: Water Temperature by Location
Lake Gregory: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Lake Gregory, a mountain reservoir in Southern California’s San Bernardino Mountains, tends to run cooler than lower-elevation lakes, and surface temperatures change noticeably with the seasons. In winter the water is cold, commonly around 38–48°F (3–9°C). Spring brings gradual warming to roughly 45–60°F (7–16°C) as daylight and air temperatures increase. Peak summer conditions can raise surface temperatures to approximately 60–75°F (15–24°C) on warm, sunny days, though cooler pockets persist below the surface. By autumn the lake generally cools back toward the 50–60°F range (10–16°C). Local weather, recent storms, wind and lake depth all influence short-term fluctuations, and deeper water remains colder year-round.
Swimming is permitted in designated beach and roped-off areas at Lake Gregory when the park’s facilities are open, typically during the warmer months, and lifeguards or park staff may be on duty during posted hours. Authorities monitor conditions and may restrict swimming for reasons such as poor water quality, algal blooms, low water levels or hazardous weather; cold-water temperatures can also increase the risk of hypothermia and limit comfortable swimming outside peak summer periods. Visitors should follow posted rules, heed staff guidance and be aware that temperatures vary by season and depth.