Greater Sudbury — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Greater Sudbury, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Greater Sudbury 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 |
|---|---|---|---|
| SEP 6 | 19.9°C | 15.9°C | |
| SEP 7 | 19.7°C | 15.9°C | |
| SEP 8 | 19.4°C | 15.9°C | |
| SEP 9 | 18.7°C | 15.9°C | |
| SEP 10 | 18.5°C | 15.9°C | |
| SEP 12 | 19.0°C | 15.9°C | |
| SEP 13 | 18.5°C | 15.9°C | |
| SEP 14 | 15.9°C | 18.5°C | |
| SEP 15 | 15.9°C | 18.3°C | |
| SEP 16 | 15.9°C | 18.2°C | |
| SEP 17 | 15.9°C | 18.1°C | |
| SEP 18 | 15.9°C | 17.9°C | |
| SEP 19 | 15.9°C | 17.8°C | |
| SEP 20 | 15.9°C | 17.7°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 | 3°C | 4°C |
| February | 0°C | 3°C | 4°C |
| March | 0°C | 3°C | 5°C |
| April | 0°C | 5°C | 11°C |
| May | 3°C | 9°C | 15°C |
| June | 7°C | 14°C | 18°C |
| July | 15°C | 19°C | 24°C |
| August | 17°C | 19°C | 24°C |
| September | 11°C | 16°C | 21°C |
| October | 7°C | 12°C | 16°C |
| November | 2°C | 7°C | 11°C |
| December | 0°C | 3°C | 6°C |
Greater Sudbury: Weather Forecast
September 14
September 15
September 16
September 17
September 18
Location & Local Information
Greater Sudbury is famously home to 330 lakes, and these water bodies, like the central Ramsey Lake, experience a substantial seasonal temperature range typical of inland Northern Ontario. In the cold winter months, all major lakes are completely frozen, with water temperatures near freezing, typically ranging from 0∘C to 5∘C (32∘F to 41∘F). During the peak summer season, surface water warms up considerably for swimming, generally reaching a comfortable range of 20∘C to 24∘C (68∘F to 75∘F) in August.
Swimming is widely permitted and popular across Greater Sudbury, which proudly operates several supervised municipal beaches on lakes like Ramsey (Bell Park and Moonlight Beach) and Whitewater. These beaches, including the Blue Flag certified Bell Park and Moonlight Beach, have lifeguards on duty during the official summer season, confirming their status as safe, designated swimming areas. However, Public Health Sudbury & Districts routinely samples 34 local beaches for E. coli bacteria. Swimmers must always check for and adhere to swimming advisories which are frequently issued, particularly after heavy rains, when bacterial levels can temporarily exceed acceptable limits.