Crater Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Crater Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Crater Lake today is 8.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 47°F (8°C) to 50°F (10°C). This is still cool water, suitable only for experienced swimmers or those accustomed to cold water. Swimming in such conditions is possible, but not recommended for prolonged periods. Extra caution should be taken during extended exposure, as the cold water can cause heat loss and lead to hypothermia. For added comfort, special clothing can be used. 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 2 | 10.0°C | 16.0°C | |
| JUN 3 | 9.2°C | 16.0°C | |
| JUN 4 | 9.6°C | 16.0°C | |
| JUN 5 | 10.0°C | 16.0°C | |
| JUN 6 | 9.4°C | 16.0°C | |
| JUN 7 | 9.6°C | 16.0°C | |
| JUN 8 | 10.0°C | 16.0°C | |
| JUN 10 | 16.0°C | 9.3°C | |
| JUN 11 | 16.0°C | 9.6°C | |
| JUN 12 | 16.0°C | 10.0°C | |
| JUN 13 | 16.0°C | 10.3°C | |
| JUN 14 | 16.0°C | 10.7°C | |
| JUN 15 | 16.0°C | 11.0°C | |
| JUN 16 | 16.0°C | 11.4°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 | 0°C | 2°C | 4°C |
| February | 0°C | 1°C | 3°C |
| March | 0°C | 4°C | 7°C |
| April | 1°C | 9°C | 15°C |
| May | 5°C | 13°C | 21°C |
| June | 8°C | 16°C | 23°C |
| July | 18°C | 22°C | 26°C |
| August | 19°C | 23°C | 27°C |
| September | 16°C | 19°C | 22°C |
| October | 9°C | 13°C | 17°C |
| November | 0°C | 5°C | 9°C |
| December | 0°C | 2°C | 4°C |
Crater Lake: Water Temperature by Location
Crater Lake: Weather Forecast
June 9
June 10
June 11
June 12
Location & Local Information
Crater Lake is famous for its clear, deep water, which stays much cooler than most recreational lakes. Surface temperatures vary by season: in summer the lake typically reaches about 50–60°F (10–16°C) at the surface on warmer days, while spring and fall surface readings are commonly in the 40–50°F (4–10°C) range. In winter the surface can approach freezing, roughly 32–40°F (0–4°C) where ice or slush can occur in protected spots. Because of the lake’s great depth, the deep layers remain near the temperature of maximum density for freshwater, about 39°F (4°C), year‑round, so the water resists warming even in summer.
Swimming in Crater Lake is permitted but tightly constrained by park rules and safety concerns. Public shoreline access is limited—most visitors reach the water via the Cleetwood Cove Trail—and the lake’s cold temperatures create a substantial hypothermia risk even on warm days. Fragile shoreline environments and steep rim terrain also limit where people may enter the water. Park guidance emphasizes preparedness, short immersion times, and awareness that the water will feel dangerously cold; visitors should follow posted regulations and rangers’ advice if they choose to swim.