Oshawa — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Oshawa, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Oshawa today is 18.7°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 15 | 21.3°C | 19.5°C | |
| SEP 16 | 20.5°C | 19.5°C | |
| SEP 17 | 19.8°C | 19.5°C | |
| SEP 18 | 20.3°C | 19.5°C | |
| SEP 19 | 20.0°C | 19.5°C | |
| SEP 20 | 19.9°C | 19.5°C | |
| SEP 21 | 18.8°C | 19.5°C | |
| SEP 22 | 19.0°C | 19.5°C | |
| SEP 23 | 19.5°C | 18.7°C | |
| SEP 24 | 19.5°C | 18.8°C | |
| SEP 25 | 19.5°C | 18.8°C | |
| SEP 26 | 19.5°C | 18.9°C | |
| SEP 27 | 19.5°C | 18.9°C | |
| SEP 28 | 19.5°C | 18.9°C | |
| SEP 29 | 19.5°C | 19.0°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 | 4°C | 7°C |
| February | -1°C | 1°C | 3°C |
| March | -1°C | 3°C | 6°C |
| April | 0°C | 6°C | 12°C |
| May | 8°C | 13°C | 18°C |
| June | 14°C | 18°C | 22°C |
| July | 16°C | 21°C | 26°C |
| August | 19°C | 22°C | 25°C |
| September | 16°C | 20°C | 23°C |
| October | 10°C | 15°C | 20°C |
| November | 4°C | 9°C | 14°C |
| December | 0°C | 3°C | 5°C |
Oshawa: Weather Forecast
September 23
September 24
September 25
September 26
September 27
September 28
Location & Local Information
Oshawa, like other municipalities on the Great Lakes, sits on the shore of Lake Ontario, a large, deep body of water whose temperature is slow to change. In the deep winter months, the lake water remains near freezing, typically ranging from 1∘C to 4∘C (34∘F to 39∘F). Even in the peak summer season, Lake Ontario's immense volume prevents it from becoming truly warm; surface temperatures in the swimming areas generally peak in the range of 18∘C to 24∘C (64∘F to 75∘F), with late August often being the warmest period.
Swimming is permitted and actively encouraged at Oshawa’s main waterfront access point, Lakeview Park Beach. The City of Oshawa maintains two sections here, with Lakeview Park Beach East being supervised by lifeguards daily during the summer season, confirming its status as a designated safe swimming area. However, the Durham Region Health Department monitors the water for E. coli bacteria, and high levels, which often occur after heavy rainfall, can lead to No Swimming advisories. Swimmers must also be cautious of the risk of cold upwellings—where cold bottom water rises unexpectedly—which can cause the surface temperature to drop rapidly, even on the hottest days.