Jack Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Jack Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Jack Lake today is 19.1°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 |
|---|---|---|---|
| SEP 14 | 19.6°C | 19.5°C | |
| SEP 15 | 20.7°C | 19.5°C | |
| SEP 16 | 19.8°C | 19.5°C | |
| SEP 17 | 19.1°C | 19.5°C | |
| SEP 18 | 19.9°C | 19.5°C | |
| SEP 19 | 19.4°C | 19.5°C | |
| SEP 20 | 19.3°C | 19.5°C | |
| SEP 21 | 19.1°C | 19.5°C | |
| SEP 22 | 19.5°C | 19.1°C | |
| SEP 23 | 19.5°C | 19.1°C | |
| SEP 24 | 19.5°C | 19.2°C | |
| SEP 25 | 19.5°C | 19.2°C | |
| SEP 26 | 19.5°C | 19.2°C | |
| SEP 27 | 19.5°C | 19.2°C | |
| SEP 28 | 19.5°C | 19.2°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 | 5°C |
| March | 0°C | 3°C | 6°C |
| April | 1°C | 7°C | 12°C |
| May | 4°C | 10°C | 16°C |
| June | 10°C | 15°C | 20°C |
| July | 18°C | 24°C | 29°C |
| August | 18°C | 22°C | 25°C |
| September | 17°C | 20°C | 22°C |
| October | 13°C | 16°C | 19°C |
| November | 3°C | 9°C | 15°C |
| December | 0°C | 4°C | 7°C |
Jack Lake: Water Temperature by Location
Jack Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Jack Lake, a freshwater body located in the Kawartha region of Ontario, experiences the full range of temperatures typical of a Canadian inland lake. In the winter months, the lake freezes completely, with water temperatures dropping to the near-freezing range of 0∘C to 5∘C (32∘F to 41∘F). In the peak summer season, the lake warms significantly, with surface temperatures typically reaching a comfortable range for swimming, likely peaking between 20∘C and 24∘C (68∘F to 75∘F), with late July and August being the most enjoyable time for a dip.
Swimming is widely permitted and popular throughout Jack Lake, as it is a highly utilized recreational and cottage lake, confirming it as a prime summer destination. However, like most non-municipal lakes in the region, there are no designated, supervised public beaches with official lifeguards. Therefore, all swimming is strictly at one's own risk. Swimmers should be mindful of boat traffic, especially in channels and near docks, and should exercise caution regarding the presence of natural hazards like submerged rocks and sudden drop-offs.