Lake Samish — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Samish, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Samish today is 18.7°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 |
|---|---|---|---|
| AUG 24 | 19.4°C | 24.0°C | |
| AUG 25 | 19.2°C | 24.0°C | |
| AUG 26 | 19.1°C | 24.0°C | |
| AUG 27 | 19.2°C | 24.0°C | |
| AUG 28 | 19.2°C | 24.0°C | |
| AUG 29 | 19.0°C | 24.0°C | |
| AUG 30 | 19.4°C | 24.0°C | |
| AUG 31 | 19.3°C | 24.0°C | |
| SEP 1 | 21.0°C | 18.8°C | |
| SEP 2 | 21.0°C | 18.9°C | |
| SEP 3 | 21.0°C | 19.0°C | |
| SEP 4 | 21.0°C | 19.2°C | |
| SEP 5 | 21.0°C | 19.3°C | |
| SEP 6 | 21.0°C | 19.4°C | |
| SEP 7 | 21.0°C | 19.5°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 | 3°C | 7°C |
| February | 2°C | 5°C | 8°C |
| March | 4°C | 8°C | 11°C |
| April | 6°C | 11°C | 15°C |
| May | 10°C | 16°C | 21°C |
| June | 13°C | 19°C | 24°C |
| July | 15°C | 23°C | 31°C |
| August | 18°C | 24°C | 30°C |
| September | 16°C | 21°C | 26°C |
| October | 11°C | 16°C | 20°C |
| November | 5°C | 10°C | 14°C |
| December | 4°C | 7°C | 9°C |
Lake Samish: Water Temperature by Location
Lake Samish: Weather Forecast
September 1
September 2
September 3
September 4
September 5
September 6
Location & Local Information
Lake Samish in northwest Washington typically has cool, temperate water that changes noticeably with the seasons. In winter the surface often sits around 35–45°F (2–7°C), rising in spring to roughly 45–60°F (7–16°C) as runoff and sun warm the shallows. By mid to late summer surface temperatures commonly reach about 65–75°F (18–24°C) on warm afternoons, while early fall sees a gradual decline into the 55–65°F (13–18°C) range. These figures are seasonal surface ranges; deeper water remains colder year-round, and localized conditions such as shade, wind, and inflows can create variation day to day.
Swimming at Lake Samish is generally permitted from public access points and private shorelines, and many people swim there in summer when surface temperatures are most comfortable. There are typically no lifeguards, so swimmers should exercise caution and be aware of cold-water shock, especially early or late in the season. Water quality can vary with algal blooms or runoff, so it’s sensible to check current advisories before swimming. In short, Lake Samish offers summer swimming opportunities when surface temperatures are warmest, but safety and local conditions determine when it’s appropriate to enter the water.