Water temperature in Toronto (ON) in May
Is it warm enough to swim in Toronto in May? Average water temperature in Toronto in May is 7°C and therefore is not suitable for comfortable swimming. The warmest water in Toronto in May is 16.6°C, and the coldest is 2.5°C. Average high air temperature in Toronto in May is 18°C, and average low temperature is 10°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Toronto
Changes water temperature in Toronto in May 2025, 2024
To get an accurate forecast for the water temperature in Toronto for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Toronto, 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 | 3.4°C | 6°C | 3°C | 6°C |
| 2 May | 4.6°C | 5.9°C | 3°C | 6.3°C |
| 3 May | 4.6°C | 6.1°C | 2.9°C | 6.3°C |
| 4 May | 4.6°C | 7.3°C | 2.8°C | 7.3°C |
| 5 May | 4.7°C | 7.2°C | 2.8°C | 7.2°C |
| 6 May | 4.6°C | 7.3°C | 3°C | 7.3°C |
| 7 May | 4.2°C | 6.6°C | 3.3°C | 7.7°C |
| 8 May | 4.7°C | 7.4°C | 3.3°C | 8°C |
| 9 May | 4.9°C | 6.8°C | 4°C | 9.9°C |
| 10 May | 4.9°C | 6.7°C | 3.6°C | 9.6°C |
| 11 May | 5°C | 7.8°C | 3.6°C | 8.8°C |
| 12 May | 5.3°C | 7.8°C | 3.3°C | 7.8°C |
| 13 May | 5.4°C | 8°C | 2.9°C | 8.6°C |
| 14 May | 5.7°C | 8.1°C | 3.4°C | 10°C |
| 15 May | 6°C | 8.2°C | 3.4°C | 10.4°C |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| 16 May | 5.3°C | 9°C | 3.7°C | 9.6°C |
| 17 May | 5°C | 9.8°C | 2.5°C | 9.8°C |
| 18 May | 5.5°C | 9.8°C | 3.5°C | 10.1°C |
| 19 May | 6.2°C | 11°C | 4.2°C | 11.7°C |
| 20 May | 5.9°C | 12.3°C | 4.5°C | 12.6°C |
| 21 May | 5.8°C | 12.3°C | 4°C | 12.8°C |
| 22 May | 6.2°C | 13.6°C | 3.5°C | 13.6°C |
| 23 May | 6.5°C | 13.7°C | 4.3°C | 13.7°C |
| 24 May | 6.6°C | 14.3°C | 3.8°C | 14.8°C |
| 25 May | 6.1°C | 13.3°C | 4.6°C | 14.7°C |
| 26 May | 5.8°C | 12.9°C | 3.3°C | 14.7°C |
| 27 May | 6.5°C | 13°C | 3.9°C | 14.7°C |
| 28 May | 6.7°C | 12.8°C | 4.2°C | 15.6°C |
| 29 May | 6.9°C | 13.1°C | 4.6°C | 15.9°C |
| 30 May | 7.7°C | 12.8°C | 5.1°C | 16.6°C |
| 31 May | 7.7°C | 11.7°C | 4.9°C | 16.1°C |
Average water temperature in Toronto in May over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 8.5°C | 6.5°C | 6.7°C | 4.1°C | 6°C |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 7.9°C | 7.2°C | 8.2°C | 9.8°C | 5.6°C |
Toronto sea state in May
Chart comparing the height of waves in Toronto 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 Toronto in May
This data display average monthly climate indicators in Toronto 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 temperature18°C
- Average LOW temperature10°C
- Average rainfall days13 days
- Average rainfall3.2''/81mm
- Average daylight15h
- Average sunshine7.3h
- Average UV index7
Toronto water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
