Saint John River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Saint John River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Saint John River today is 8.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 47°F (8°C) to 50°F (10°C). This is still cool water, suitable only for experienced swimmers or those accustomed to cold water. Swimming in such conditions is possible, but not recommended for prolonged periods. Extra caution should be taken during extended exposure, as the cold water can cause heat loss and lead to hypothermia. For added comfort, special clothing can be used. 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 |
|---|---|---|---|
| OCT 5 | 11.1°C | 12.5°C | |
| OCT 6 | 11.2°C | 12.5°C | |
| OCT 7 | 11.9°C | 12.5°C | |
| OCT 8 | 10.1°C | 12.5°C | |
| OCT 9 | 9.4°C | 12.5°C | |
| OCT 10 | 10.0°C | 12.5°C | |
| OCT 11 | 9.2°C | 12.5°C | |
| OCT 12 | 8.9°C | 12.5°C | |
| OCT 13 | 12.5°C | 9.1°C | |
| OCT 14 | 12.5°C | 9.3°C | |
| OCT 15 | 12.5°C | 9.4°C | |
| OCT 16 | 12.5°C | 9.6°C | |
| OCT 17 | 12.5°C | 9.8°C | |
| OCT 18 | 12.5°C | 10.0°C | |
| OCT 19 | 12.5°C | 10.2°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 | 2°C | 6°C | 9°C |
| February | 2°C | 6°C | 9°C |
| March | 3°C | 7°C | 11°C |
| April | 3°C | 10°C | 16°C |
| May | 5°C | 13°C | 21°C |
| June | 11°C | 17°C | 22°C |
| July | 16°C | 20°C | 24°C |
| August | 17°C | 21°C | 25°C |
| September | 11°C | 16°C | 21°C |
| October | 8°C | 13°C | 17°C |
| November | 3°C | 8°C | 16°C |
| December | 3°C | 5°C | 8°C |
Saint John River: Water Temperature by Location
Saint John River: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Source Saint John Ponds
• location Somerset County, Maine, United States
Mouth Bay of Fundy
• location Saint John, New Brunswick, Canada
Length 673 km (418 mi)
The Saint John River, flowing through both the United States and Canada, provides a beautiful and relatively tranquil setting for outdoor activities, including swimming. The water temperature in the river varies depending on the season and location, but in the warmer months of summer, it typically ranges between 60°F to 75°F (15°C to 24°C), offering comfortable swimming conditions. During the cooler months, the temperature can drop significantly, especially in the northern sections of the river near New Brunswick, making swimming less inviting.
Swimming opportunities along the Saint John River are available in various regions, particularly near cities like Fredericton and Saint John in Canada, as well as the areas closer to the U.S. border. In these places, locals and visitors alike enjoy the river's calm stretches, which make it suitable for swimming. While the water is generally clean and safe, swimmers should be cautious of the river's varying currents, especially near the dam areas and after heavy rainfall. Overall, the Saint John River, with its scenic views and moderate water temperatures during the summer, is a popular spot for swimming and other water-based activities, offering a peaceful experience in nature.