St. Catharines — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in St. Catharines, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in St. Catharines today is 19.4°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 | 21.0°C | 19.0°C | |
| SEP 16 | 20.9°C | 19.0°C | |
| SEP 17 | 20.2°C | 19.0°C | |
| SEP 18 | 20.8°C | 19.0°C | |
| SEP 19 | 20.9°C | 19.0°C | |
| SEP 20 | 20.7°C | 19.0°C | |
| SEP 21 | 19.9°C | 19.0°C | |
| SEP 22 | 19.8°C | 19.0°C | |
| SEP 23 | 19.0°C | 19.4°C | |
| SEP 24 | 19.0°C | 19.4°C | |
| SEP 25 | 19.0°C | 19.3°C | |
| SEP 26 | 19.0°C | 19.3°C | |
| SEP 27 | 19.0°C | 19.3°C | |
| SEP 28 | 19.0°C | 19.3°C | |
| SEP 29 | 19.0°C | 19.3°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 | 4°C | 7°C |
| February | 0°C | 2°C | 4°C |
| March | -1°C | 3°C | 6°C |
| April | 1°C | 7°C | 13°C |
| May | 8°C | 13°C | 18°C |
| June | 12°C | 17°C | 22°C |
| July | 15°C | 20°C | 26°C |
| August | 18°C | 22°C | 26°C |
| September | 14°C | 19°C | 24°C |
| October | 8°C | 15°C | 21°C |
| November | 4°C | 11°C | 17°C |
| December | 1°C | 4°C | 6°C |
St. Catharines: Weather Forecast
September 23
September 24
September 25
September 26
September 27
September 28
Location & Local Information
St. Catharines, situated on the southern shore of Lake Ontario, offers residents and visitors easy access to the lake's inviting waters. During the summer months, the water temperature in Lake Ontario near St. Catharines typically ranges from 68°F to 74°F (20°C to 23°C). These temperatures make it comfortable for swimming, and the city's waterfront areas, such as Sunset Beach and Port Dalhousie, become popular destinations for those looking to cool off. The water is warm enough for an enjoyable swim but can feel refreshing, especially on warmer days when the breeze picks up.
The waterfront of St. Catharines is a bustling area, with both locals and tourists flocking to the lake's shores for swimming, sunbathing, and other recreational activities. The city also has beaches with amenities like lifeguards during peak summer months, ensuring a safer environment for those looking to swim. In addition to swimming, people can engage in various water sports such as kayaking, paddleboarding, and sailing, taking full advantage of the lake's open waters.
During the colder months, the water temperature in Lake Ontario around St. Catharines drops significantly, often falling between 34°F and 41°F (1°C to 5°C), making swimming unsafe. However, during the warmer months, the lake provides a refreshing retreat for swimming and water activities. Its relatively warm temperatures and scenic surroundings make St. Catharines a popular location for enjoying the outdoors.