Lake Tapps — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Tapps, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Tapps today is 18.1°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 | 18.1°C | 23.9°C | |
| AUG 25 | 18.0°C | 23.9°C | |
| AUG 26 | 18.1°C | 23.9°C | |
| AUG 27 | 18.1°C | 23.9°C | |
| AUG 28 | 18.2°C | 23.9°C | |
| AUG 29 | 18.8°C | 23.9°C | |
| AUG 30 | 18.8°C | 23.9°C | |
| AUG 31 | 18.5°C | 23.9°C | |
| SEP 1 | 21.5°C | 18.3°C | |
| SEP 2 | 21.5°C | 18.4°C | |
| SEP 3 | 21.5°C | 18.6°C | |
| SEP 4 | 21.5°C | 18.8°C | |
| SEP 5 | 21.5°C | 19.0°C | |
| SEP 6 | 21.5°C | 19.1°C | |
| SEP 7 | 21.5°C | 19.3°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 | 5°C | 8°C | 11°C |
| April | 6°C | 11°C | 15°C |
| May | 11°C | 16°C | 21°C |
| June | 12°C | 18°C | 24°C |
| July | 13°C | 22°C | 31°C |
| August | 17°C | 24°C | 30°C |
| September | 17°C | 22°C | 26°C |
| October | 13°C | 17°C | 20°C |
| November | 7°C | 11°C | 14°C |
| December | 4°C | 7°C | 9°C |
Lake Tapps: Water Temperature by Location
Lake Tapps: Weather Forecast
September 1
September 2
September 3
September 4
September 5
September 6
Location & Local Information
Lake Tapps is a managed reservoir in Washington whose surface temperatures vary noticeably with the seasons. In spring the water typically warms from around 45–60°F (7–16°C) as air temperatures moderate; summer brings the warmest surface readings, often in the 62–75°F range (17–24°C) on sunny days; fall cooling usually yields 50–65°F (10–18°C); and winter surface temperatures commonly sit near 35–45°F (2–7°C), depending on storms and cold snaps. Because Lake Tapps is relatively deep in places and subject to inflows and reservoir operations, deeper water remains much colder than the surface and sudden changes in temperature can occur. Weather, wind, reservoir releases and local shading all influence day-to-day readings.
Swimming is possible at Lake Tapps and is commonly done from public parks, marinas and private shorelines, but it is generally allowed only in appropriate areas and without lifeguard supervision. Visitors should be cautious: boat traffic, submerged structures, sudden drop-offs and cold water below the surface are real hazards, and occasional water-quality issues such as algal blooms or bacterial contamination can lead to temporary advisories against swimming. For safety and comfort, swimmers are advised to choose sheltered spots, wear a life jacket when boating, and heed any local advisories before entering the water.