Seymour Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Seymour Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Seymour Lake today is 18.6°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 |
|---|---|---|---|
| JUN 23 | 14.9°C | 15.0°C | |
| JUN 24 | 15.2°C | 15.0°C | |
| JUN 25 | 15.5°C | 15.0°C | |
| JUN 26 | 15.8°C | 15.0°C | |
| JUN 27 | 16.0°C | 15.0°C | |
| JUN 28 | 17.3°C | 15.0°C | |
| JUN 29 | 18.6°C | 15.0°C | |
| JUN 30 | 18.9°C | 15.0°C | |
| JUL 1 | 23.5°C | 18.8°C | |
| JUL 2 | 23.5°C | 19.1°C | |
| JUL 3 | 23.5°C | 19.3°C | |
| JUL 4 | 23.5°C | 19.6°C | |
| JUL 5 | 23.5°C | 19.8°C | |
| JUL 6 | 23.5°C | 20.1°C | |
| JUL 7 | 23.5°C | 20.3°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 | 2°C | 4°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 3°C | 6°C |
| April | 2°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 | 20°C | 23°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 | 1°C | 4°C | 7°C |
Seymour Lake: Water Temperature by Location
Seymour Lake: Weather Forecast
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July 4
July 5
Location & Local Information
Seymour Lake in Ontario, located near Campbellford, is a large, natural body of water whose temperature is primarily determined by the region's continental climate. In the cold winter months, the lake freezes completely, with water temperatures near the freezing point, generally ranging from 0∘C to 5∘C (32∘F to 41∘F). In the peak summer season (July and August), the shallow nature of many inland Ontario lakes allows the surface water to warm considerably, typically reaching a comfortable range for swimming, likely peaking between 20∘C and 24∘C (68∘F to 75∘F).
Swimming is generally permitted and popular at Seymour Lake, as it is a major recreational area for cottage owners and visitors. A particular designated swimming spot is the Seymour Conservation Area, which features a former limestone quarry that now serves as a tranquil swimming hole, confirming its use for water contact recreation. However, there are typically no official lifeguards on duty at the lake's natural swimming locations, meaning all swimming is undertaken strictly at one's own risk. Like many Ontario lakes, swimmers should be aware of the possibility of water quality advisories due to bacterial or algal blooms, especially during the late summer.