Grays Harbor Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Grays Harbor Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Grays Harbor Lake today is 19.9°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 | 20.3°C | 22.5°C | |
| AUG 25 | 20.4°C | 22.5°C | |
| AUG 26 | 20.5°C | 22.5°C | |
| AUG 27 | 20.5°C | 22.5°C | |
| AUG 28 | 20.5°C | 22.5°C | |
| AUG 29 | 20.3°C | 22.5°C | |
| AUG 30 | 20.3°C | 22.5°C | |
| AUG 31 | 20.0°C | 22.5°C | |
| SEP 1 | 19.0°C | 19.9°C | |
| SEP 2 | 19.0°C | 19.8°C | |
| SEP 3 | 19.0°C | 19.8°C | |
| SEP 4 | 19.0°C | 19.7°C | |
| SEP 5 | 19.0°C | 19.7°C | |
| SEP 6 | 19.0°C | 19.6°C | |
| SEP 7 | 19.0°C | 19.6°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 | 0°C | 4°C | 7°C |
| March | 1°C | 4°C | 8°C |
| April | 6°C | 11°C | 15°C |
| May | 11°C | 16°C | 21°C |
| June | 13°C | 18°C | 23°C |
| July | 15°C | 21°C | 26°C |
| August | 18°C | 23°C | 27°C |
| September | 16°C | 19°C | 22°C |
| October | 10°C | 13°C | 16°C |
| November | 4°C | 9°C | 13°C |
| December | 0°C | 4°C | 8°C |
Grays Harbor Lake: Water Temperature by Location
Grays Harbor Lake: Weather Forecast
September 1
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September 3
September 4
September 5
Location & Local Information
Grays Harbor is not a traditional inland lake but a large tidal estuary on Washington’s coast, so its water behaves more like nearshore ocean water than a warm lake. Typical surface temperatures vary through the year: in winter months water often sits around 45–50°F (7–10°C), spring brings gradual warming to roughly 48–54°F (9–12°C), summer highs can reach about 52–60°F (11–16°C) in the warmest weeks, and fall usually cools back toward 50–55°F (10–13°C). Local conditions—tidal exchange, fresh-water inflow from rivers, and daily weather—produce variation, and shallow bays or estuary arms can warm or cool somewhat differently than the main harbor.
Swimming is generally allowed along beaches and in designated areas of the Grays Harbor shoreline, but conditions mean it’s not the same as summer lake swimming farther inland. Cold water temperatures, strong tidal currents, rip currents, and sometimes debris or shifting sandbars make open-water swimming potentially hazardous; lifeguards are not always present. For those who choose to enter the water, use caution, check local advisories, and consider a wetsuit or short immersions rather than prolonged swims. Recreational uses like tidepooling, beachcombing, and supervised paddle sports are common ways to enjoy the harbor.