Timothy Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Timothy Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Timothy Lake today is 16.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 | 18.0°C | 18.0°C | |
| SEP 15 | 17.1°C | 18.0°C | |
| SEP 16 | 17.3°C | 18.0°C | |
| SEP 17 | 16.6°C | 18.0°C | |
| SEP 18 | 16.9°C | 18.0°C | |
| SEP 19 | 17.1°C | 18.0°C | |
| SEP 20 | 16.3°C | 18.0°C | |
| SEP 22 | 18.0°C | 16.2°C | |
| SEP 23 | 18.0°C | 16.3°C | |
| SEP 24 | 18.0°C | 16.4°C | |
| SEP 25 | 18.0°C | 16.5°C | |
| SEP 26 | 18.0°C | 16.6°C | |
| SEP 27 | 18.0°C | 16.7°C | |
| SEP 28 | 18.0°C | 16.8°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 | 2°C | 4°C |
| February | 0°C | 2°C | 4°C |
| March | 1°C | 4°C | 7°C |
| April | 3°C | 9°C | 15°C |
| May | 6°C | 14°C | 21°C |
| June | 9°C | 16°C | 23°C |
| July | 10°C | 18°C | 26°C |
| August | 13°C | 20°C | 27°C |
| September | 13°C | 18°C | 22°C |
| October | 9°C | 12°C | 15°C |
| November | 1°C | 6°C | 9°C |
| December | 0°C | 3°C | 6°C |
Timothy Lake: Water Temperature by Location
Timothy Lake: Weather Forecast
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Timothy Lake’s water is seasonally cool to cold, reflecting its Cascade Mountain setting and reservoir depth. In spring the surface commonly ranges from about 40–55°F (4–13°C) as snowmelt and runoff keep temperatures low. By summer, surface temperatures warm to roughly 55–68°F (13–20°C) on sunny days, with the warmest readings usually in July and August; even then deeper or shaded areas remain noticeably colder. In fall the lake cools back toward roughly 45–55°F (7–13°C), and in winter the surface can approach freezing, generally sitting near 32–40°F (0–4°C) when not iced over.
Swimming at Timothy Lake is permitted because it is managed as a public recreation reservoir with shore access, campgrounds and boat ramps; there are no widespread prohibitions on entering the water. However, there are no lifeguards or supervised swimming beaches, and the naturally low temperatures—even in summer—raise a real risk of cold-water shock and hypothermia, especially for prolonged or deep-water exposure. Visitors planning to swim should be aware of steep drop-offs, boat traffic, and rapidly changing weather, and should take appropriate precautions such as wearing a wetsuit or limiting time in the water.