Water temperature in Sarnia (ON) in April
Is it warm enough to swim in Sarnia in April? Average water temperature in Sarnia in April is 3.1°C and therefore is not suitable for comfortable swimming. The warmest water in Sarnia in April is 7.3°C, and the coldest is -0°C. Average high air temperature in Sarnia in April is 12°C, and average low temperature is 2°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Sarnia
Changes water temperature in Sarnia in April 2025, 2024
To get an accurate forecast for the water temperature in Sarnia for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Sarnia, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of April.
You can choose any other years:
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| 1 April | 1.8°C | 2.8°C | 0.6°C | 3.7°C |
| 2 April | 1.7°C | 2.7°C | 0.1°C | 3.8°C |
| 3 April | 1.9°C | 3.8°C | 0.1°C | 3.9°C |
| 4 April | 0°C | 2.7°C | 0°C | 4.1°C |
| 5 April | 0.1°C | 3.3°C | 0.1°C | 3.9°C |
| 6 April | 0.4°C | 3.6°C | 0.2°C | 4.5°C |
| 7 April | 2.5°C | 3.5°C | 0.9°C | 4.3°C |
| 8 April | 2.9°C | 4.1°C | 0.5°C | 4.4°C |
| 9 April | 2.9°C | 3.9°C | 1.1°C | 4.6°C |
| 10 April | 2.8°C | 4°C | 1°C | 4.4°C |
| 11 April | 2.9°C | 3.9°C | 0.8°C | 4.7°C |
| 12 April | 3°C | 3.8°C | 0.8°C | 4.7°C |
| 13 April | 2.7°C | 4.1°C | 1.5°C | 5.6°C |
| 14 April | 3.4°C | 4.3°C | 1.6°C | 4.8°C |
| 15 April | 3.7°C | 6.2°C | 1.7°C | 6.2°C |
| Day | 2025 | 2024 | Min | Max |
|---|---|---|---|---|
| 16 April | 3.7°C | 4.9°C | 1.7°C | 4.9°C |
| 17 April | 3.3°C | 5°C | 1.8°C | 5.2°C |
| 18 April | 3.3°C | 4.9°C | 1.8°C | 7.3°C |
| 19 April | 3.3°C | 5.9°C | 2.1°C | 5.9°C |
| 20 April | 3.4°C | 5.7°C | 2.3°C | 5.7°C |
| 21 April | 4.5°C | 6.1°C | 2.3°C | 6.1°C |
| 22 April | 4.3°C | 5.8°C | 1.9°C | 5.8°C |
| 23 April | 5.4°C | 6.2°C | 2.3°C | 6.2°C |
| 24 April | 5.4°C | 5.8°C | 2.5°C | 5.8°C |
| 25 April | 5.2°C | 5.6°C | 2.7°C | 5.6°C |
| 26 April | 5.7°C | 5.1°C | 2.9°C | 5.7°C |
| 27 April | 5.3°C | 5.1°C | 2.7°C | 5.9°C |
| 28 April | 6.4°C | 5.6°C | 2.9°C | 6.4°C |
| 29 April | 6.9°C | 5.4°C | 3°C | 6.9°C |
| 30 April | 5.7°C | 5.3°C | 2.9°C | 5.9°C |
Average water temperature in Sarnia in April over a decade
| 2016 | 2017 | 2018 | 2019 | 2020 |
| 2.8°C | 3°C | 1.9°C | 3°C | 3.1°C |
| 2021 | 2022 | 2023 | 2024 | 2025 |
| 4.1°C | 2.3°C | 3.5°C | 4.6°C | 3.5°C |
Sarnia sea state in April
Chart comparing the height of waves in Sarnia in April 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 Sarnia in April
This data display average monthly climate indicators in Sarnia in April 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 temperature12°C
- Average LOW temperature2°C
- Average humidity
83 - Average rainfall days12 days
- Average rainfall2.6''/66mm
- Average sunshine6.2h
- Average snowfall1.8''/46mm
Sarnia water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
