Cultus Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Cultus Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Cultus Lake today is 21.1°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 |
|---|---|---|---|
| JUL 14 | 18.5°C | 23.0°C | |
| JUL 15 | 20.1°C | 23.0°C | |
| JUL 16 | 20.4°C | 23.0°C | |
| JUL 17 | 20.5°C | 23.0°C | |
| JUL 18 | 20.5°C | 23.0°C | |
| JUL 19 | 20.3°C | 23.0°C | |
| JUL 20 | 20.4°C | 23.0°C | |
| JUL 21 | 20.4°C | 23.0°C | |
| JUL 22 | 23.0°C | 21.2°C | |
| JUL 23 | 23.0°C | 21.3°C | |
| JUL 24 | 23.0°C | 21.4°C | |
| JUL 25 | 23.0°C | 21.5°C | |
| JUL 26 | 23.0°C | 21.6°C | |
| JUL 27 | 23.0°C | 21.7°C | |
| JUL 28 | 23.0°C | 21.8°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 | 4°C | 8°C |
| February | 1°C | 5°C | 8°C |
| March | 4°C | 8°C | 11°C |
| April | 6°C | 11°C | 15°C |
| May | 9°C | 15°C | 21°C |
| June | 12°C | 18°C | 24°C |
| July | 15°C | 23°C | 31°C |
| August | 16°C | 23°C | 30°C |
| September | 15°C | 21°C | 26°C |
| October | 10°C | 15°C | 20°C |
| November | 6°C | 11°C | 14°C |
| December | 4°C | 7°C | 9°C |
Cultus Lake: Water Temperature by Location
Cultus Lake: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Cultus Lake in Washington is a relatively cool, high-elevation lake, so water temperatures vary a lot through the year. In late summer, surface temperatures commonly warm into the mid-50s to mid-60s °F (about 13–19 °C) on sunny days and occasionally approach the lower 70s °F (around 21–22 °C) in shallow, sheltered spots. Spring and fall bring much colder conditions, with typical water temperatures in the 40s to low 50s °F (roughly 4–11 °C). In winter the lake can approach freezing in shallow areas and may be near 33–40 °F (1–4 °C) where ice or slush occurs; even when not frozen, deeper water remains very cold year-round.
Swimming in Cultus Lake is generally allowed and popular during the warmest weeks of summer because the lake is managed for recreation and provides easy shoreline access. Visitors should take caution: there are often no lifeguards, weather and water temperature can change rapidly, and even summer water can feel brisk compared with ocean or lowland lakes. Cold-water shock and hypothermia risk mean short swims, wetsuits, and staying near shore are prudent when temperatures are below the comfortable range. Local park rules or temporary advisories may also limit swimming for safety or water-quality reasons.