Saint John — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Saint John (New Brunswick, Canada). It includes the current water temperature, daily data for the last month presented in a simple chart, and a 7-day forecast. The page also compares today’s value with typical averages for this period, shows usual monthly ranges during the year, and lists nearby beaches with short descriptions. Local weather for the next few days and general details about Saint John help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Saint John in the Atlantic Ocean today is 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
Water temperature in Saint John has risen over the last week and month. Currently, the sea water temperature at this location matches the average for this day in previous years.
According to our forecast, Water temperature in Saint John will be 9.1°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 2 | 8.6°C | 8.3°C | |
| JUN 3 | 8.1°C | 8.8°C | |
| JUN 4 | 8.7°C | 8.8°C | |
| JUN 5 | 8.8°C | 9.0°C | |
| JUN 6 | 9.7°C | 9.0°C | |
| JUN 7 | 10.0°C | 9.0°C | |
| JUN 8 | 9.4°C | 8.5°C | |
| JUN 9 | 8.9°C | 9.3°C | |
| JUN 10 | 9.0°C | 9.3°C | 9.0°C |
| JUN 11 | 8.8°C | 9.0°C | |
| JUN 12 | 8.8°C | 9.0°C | |
| JUN 13 | 8.8°C | 9.0°C | |
| JUN 14 | 9.5°C | 9.0°C | |
| JUN 15 | 9.3°C | 9.1°C | |
| JUN 16 | 9.0°C | 9.1°C | |
| JUN 17 | 9.0°C | 9.1°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.
Water temperature data for this location is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
Annual Water Temperature Trend
Saint John, New Brunswick, sits where the St. John River meets the Bay of Fundy, and its coastal waters reflect a strong maritime and tidal influence. Water temperatures around the city vary markedly through the year: winter averages are close to 0–4 °C, early spring typically sees 2–8 °C as waters slowly warm, summer brings the warmest surface readings generally in the range of 12–18 °C on sheltered shores and in warmer years, and autumn cooling usually produces temperatures around 6–12 °C. The Bay of Fundy’s huge tides and mixing mean that temperature can change with depth, current and exposure, so local conditions near harbour walls, estuaries and open coastlines can differ from broader averages.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 0°C | 6°C | 8°C |
| February | 1°C | 4°C | 7°C |
| March | 1°C | 3°C | 6°C |
| April | 2°C | 4°C | 7°C |
| May | 4°C | 7°C | 10°C |
| June | 7°C | 9°C | 13°C |
| July | 10°C | 12°C | 15°C |
| August | 12°C | 14°C | 17°C |
| September | 11°C | 13°C | 16°C |
| October | 10°C | 13°C | 15°C |
| November | 8°C | 10°C | 13°C |
| December | 3°C | 8°C | 11°C |
* Click on a month to view detailed water temperature data.
Saint John: Weather Forecast
June 11
June 12
June 13
Location, Beaches & Local Information
Nearby Beaches & Facilities
Tin Can Beach
Bay Shore Beach
Little River Beach
Dominion Park Beach
Tucker Park Beach
Mclarens Beach
Boar's Head Nature Preserve
Turners Flats
Saints Rest Beach
Swimming Conditions
Swimming and beach holidays in the Saint John area are shaped by those temperatures and by tidal dynamics. Peak beach season for casual swimming is brief, mainly in July and August when surface waters reach their warmest, and even then many residents prefer wetsuits or short dips rather than long swims. There are sandy and pebbly beaches and sheltered coves within short drives that suit families and shoreline recreation, while more adventurous swimmers must respect strong tidal currents and variable visibility in the Bay of Fundy. Supervised municipal beaches and freshwater lakes offer alternative options for warmer, safer bathing, and anyone planning to swim should check local conditions, tide times and advisories before entering the water.