Water temperature in Rondeau (ON) in May

Is it warm enough to swim in Rondeau in May? Average water temperature in Rondeau in May is 10°C and therefore is not suitable for comfortable swimming. The warmest water in Rondeau in May is 18.1°C, and the coldest is 4.2°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Rondeau

Changes water temperature in Rondeau in May 2025, 2024

To get an accurate forecast for the water temperature in Rondeau for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Rondeau, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of May.

Sea temperature

Tides

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 May	7°C	8.6°C	4.4°C	8.6°C
2 May	6.7°C	9.3°C	4.2°C	9.3°C
3 May	6.8°C	9.3°C	4.8°C	9.6°C
4 May	6.9°C	10.9°C	5.1°C	10.9°C
5 May	7.7°C	10.6°C	5°C	10.6°C
6 May	8.5°C	10.5°C	5.5°C	10.5°C
7 May	8.6°C	10.6°C	5.8°C	10.6°C
8 May	8.7°C	11.8°C	6.3°C	11.8°C
9 May	8°C	11.6°C	6.8°C	11.6°C
10 May	8.6°C	12.1°C	6.2°C	12.1°C
11 May	9°C	11.6°C	6.4°C	11.6°C
12 May	9.5°C	10.6°C	6.9°C	10.9°C
13 May	9.7°C	11.1°C	6.9°C	11.4°C
14 May	9.9°C	11.1°C	7.4°C	12.5°C
15 May	10.7°C	12.8°C	7.5°C	13.2°C

Day	2025	2024	Min	Max
16 May	10.9°C	12.7°C	7.3°C	12.7°C
17 May	11.1°C	12.6°C	7.7°C	12.6°C
18 May	10.9°C	12.8°C	8.1°C	12.8°C
19 May	11.2°C	14°C	7.7°C	14.1°C
20 May	11.5°C	15.7°C	8°C	15.7°C
21 May	11.6°C	16.3°C	8.5°C	16.3°C
22 May	11.8°C	16.8°C	8.9°C	17.9°C
23 May	10.6°C	16.8°C	8.5°C	17.1°C
24 May	10°C	16.7°C	8.7°C	18.1°C
25 May	10°C	17.6°C	9.3°C	17.6°C
26 May	10.6°C	17.6°C	9.5°C	17.6°C
27 May	10.7°C	16.4°C	9.9°C	16.4°C
28 May	11.2°C	16°C	10°C	16.1°C
29 May	11.2°C	15.8°C	10.4°C	16.8°C
30 May	11.5°C	14.9°C	10.6°C	16.7°C
31 May	11.2°C	14.7°C	11.2°C	16.3°C

Average water temperature in Rondeau in May over a decade

2016	2017	2018	2019	2020
10.4°C	9.4°C	9.1°C	8.3°C	8.3°C

2021	2022	2023	2024	2025
11.4°C	9.5°C	10.3°C	13.2°C	9.7°C

Rondeau sea state in May

Chart comparing the height of waves in Rondeau 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.

Rondeau water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Temperature in neighboring cities

The nearest locations with the average water temperature in May. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

	Avr	Min	Max
Wheatley	10.9°C	5.1°C	18.3°C
Mitchell's Bay	13.1°C	7.8°C	21°C
Mentor on the Lake	12°C	6.2°C	20.3°C
Headlands Beach	12°C	6.2°C	20.4°C
Algonac	12.5°C	7.1°C	19.6°C
Willoughby	12.6°C	6.5°C	20°C
St. Clair River (Port Lambton)	12.3°C	6.8°C	19.9°C
Point Pelee	11.8°C	6.2°C	19.4°C
Euclid	12.8°C	6.7°C	19.5°C
Leamington	12.5°C	6.8°C	19.6°C

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Our report for Rondeau is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

Region

Date (day and month)

Water temperature: min 16°C

Average temperature Maximum temperature