Water temperature in Saint John (NB) in May
Is it warm enough to swim in Saint John in May? Average water temperature in Saint John in May is 6.7°C and therefore is not suitable for comfortable swimming. The warmest sea in Saint John in May is 11.2°C, and the coldest is 3°C. Average high air temperature in Saint John in May is 15°C, and average low temperature is 4°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Saint John
Changes water temperature in Saint John in May 2025, 2024
To get an accurate forecast for the water temperature in Saint John for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Saint John, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of May.
You can choose any other years:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| 1 May | 5°C | 6.8°C | 3°C | 6.9°C |
| 2 May | 5.6°C | 6.5°C | 3.2°C | 7.5°C |
| 3 May | 5°C | 5.8°C | 3.7°C | 7.4°C |
| 4 May | 4.9°C | 7.1°C | 3.6°C | 7.9°C |
| 5 May | 5.1°C | 6°C | 3.8°C | 7.9°C |
| 6 May | 4.9°C | 5.7°C | 3.9°C | 8.1°C |
| 7 May | 4.5°C | 6.8°C | 4.1°C | 8.2°C |
| 8 May | 5.4°C | 7.4°C | 4.1°C | 8°C |
| 9 May | 4.9°C | 7°C | 4.4°C | 7.7°C |
| 10 May | 4.8°C | 6.5°C | 4.8°C | 8.9°C |
| 11 May | 5.8°C | 7°C | 5°C | 8.8°C |
| 12 May | 5.8°C | 7.3°C | 4.6°C | 8.9°C |
| 13 May | 5.9°C | 7.8°C | 4.5°C | 8.6°C |
| 14 May | 6.9°C | 7.8°C | 4.7°C | 8.6°C |
| 15 May | 6.5°C | 7.5°C | 5.1°C | 8.6°C |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| 16 May | 6.4°C | 7.2°C | 5.2°C | 9.6°C |
| 17 May | 6.4°C | 7.8°C | 5.1°C | 9.6°C |
| 18 May | 6.6°C | 8.3°C | 5.1°C | 10°C |
| 19 May | 6.1°C | 8.3°C | 5.2°C | 9.7°C |
| 20 May | 5.5°C | 7.8°C | 5.3°C | 9.9°C |
| 21 May | 6.5°C | 8.2°C | 5.5°C | 10.1°C |
| 22 May | 5.6°C | 8.9°C | 5.3°C | 9.7°C |
| 23 May | 5.6°C | 9.4°C | 5.1°C | 10.5°C |
| 24 May | 5.6°C | 9.1°C | 5.6°C | 10.7°C |
| 25 May | 5.5°C | 9.8°C | 5.5°C | 10.9°C |
| 26 May | 7.2°C | 9.8°C | 6°C | 10.8°C |
| 27 May | 7.3°C | 8.9°C | 6°C | 10.8°C |
| 28 May | 7.5°C | 9.2°C | 6.4°C | 11.2°C |
| 29 May | 7.8°C | 10.5°C | 6.5°C | 11°C |
| 30 May | 7.6°C | 9.4°C | 6.5°C | 10.5°C |
| 31 May | 7.5°C | 10.8°C | 6.5°C | 10.8°C |
Average water temperature in Saint John in May over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 6.8°C | 5.9°C | 6.6°C | 5.5°C | 6.6°C |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 7.5°C | 7.5°C | 7.3°C | 7.9°C | 6°C |
Saint John sea state in May
Chart comparing the height of waves in Saint John in May over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.
Weather and climate in Saint John in May
This data display average monthly climate indicators in Saint John in May based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip
- Average HIGH temperature15°C
- Average LOW temperature4°C
- Average rainfall days14 days
- Average rainfall4.3''/109mm
- Average daylight15h
- Average sunshine6.4h
- Average UV index6
- Average snowfall0.5''/13mm
Saint John water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
