Sprague Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Sprague Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Sprague Lake today is 20.3°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 |
|---|---|---|---|
| SEP 14 | 21.5°C | 19.5°C | |
| SEP 15 | 22.3°C | 19.5°C | |
| SEP 16 | 21.9°C | 19.5°C | |
| SEP 17 | 20.6°C | 19.5°C | |
| SEP 18 | 20.6°C | 19.5°C | |
| SEP 19 | 20.9°C | 19.5°C | |
| SEP 20 | 20.9°C | 19.5°C | |
| SEP 21 | 20.3°C | 19.5°C | |
| SEP 22 | 19.5°C | 20.3°C | |
| SEP 23 | 19.5°C | 20.2°C | |
| SEP 24 | 19.5°C | 20.2°C | |
| SEP 25 | 19.5°C | 20.1°C | |
| SEP 26 | 19.5°C | 20.1°C | |
| SEP 27 | 19.5°C | 20.1°C | |
| SEP 28 | 19.5°C | 20.0°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 | 1°C | 3°C | 6°C |
| March | 1°C | 4°C | 7°C |
| April | 2°C | 8°C | 13°C |
| May | 11°C | 15°C | 20°C |
| June | 15°C | 20°C | 24°C |
| July | 14°C | 20°C | 27°C |
| August | 21°C | 24°C | 27°C |
| September | 15°C | 20°C | 24°C |
| October | 10°C | 15°C | 19°C |
| November | 2°C | 7°C | 11°C |
| December | 1°C | 4°C | 6°C |
Sprague Lake: Water Temperature by Location
Sprague Lake: Weather Forecast
September 22
September 23
September 24
September 25
Location & Local Information
Sprague Lake in Washington experiences pronounced seasonal shifts in surface water temperature driven by air temperature, depth and inflows. In winter the lake commonly hovers near freezing, roughly 32–40°F (0–4°C), and can form ice in cold spells. Spring temperatures rise as runoff and warming air push surface readings into the mid-40s to low-60s °F (7–16°C). By summer the shallows and surface often warm the most, with typical summer surface ranges of about 60–75°F (16–24°C), although shallow bays can run warmer on prolonged hot days. In autumn the surface cools again to roughly 45–60°F (7–16°C). Actual temperatures vary by year, weather patterns, wind, water clarity and how deep the particular spot is.
Swimming at Sprague Lake is generally a recreational option because it is a natural freshwater lake used for multiple public uses; however access and permissibility can depend on local land ownership, posted rules and current water-quality advisories. Even in summer, cooler water temperatures can cause cold-shock or hypothermia risk, and warm months may bring algal blooms or reduced clarity that affect safety. Visitors should check local signage or county advisories before entering the water, choose well-established access points, and follow standard lake-safety precautions.