Water temperature in Grand Bend (ON) in August

Is it warm enough to swim in Grand Bend in August? Average water temperature in Grand Bend in August is 21.9°C and therefore suitable for comfortable swimming. The warmest water in Grand Bend in August is 24.2°C, and the coldest is 19°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Grand Bend

Changes water temperature in Grand Bend in August 2025, 2024

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

Sea temperature

Tides

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 August	21.9°C	21.7°C	19.5°C	23.5°C
2 August	20.2°C	21.8°C	19.8°C	23.4°C
3 August	20.4°C	24°C	20.4°C	24°C
4 August	20.7°C	23.7°C	20.1°C	23.7°C
5 August	21.1°C	23.8°C	20.1°C	23.8°C
6 August	21°C	23.7°C	20.3°C	23.7°C
7 August	21.6°C	23°C	20.7°C	23.4°C
8 August	21.8°C	22°C	20.7°C	23.3°C
9 August	22.1°C	21.7°C	20.7°C	23.1°C
10 August	22.9°C	21.4°C	20.5°C	23.9°C
11 August	23.3°C	21.2°C	20.4°C	23.9°C
12 August	23.3°C	20.9°C	20.5°C	23.9°C
13 August	23.3°C	20.9°C	19.4°C	23.8°C
14 August	23.2°C	20.9°C	19°C	23.5°C
15 August	23.6°C	21.1°C	19.2°C	23.8°C

Day	2025	2024	Min	Max
16 August	23.3°C	21.4°C	19.2°C	23.5°C
17 August	23°C	21.7°C	19.7°C	23.2°C
18 August	22.8°C	21.6°C	19.7°C	23.7°C
19 August	22.6°C	21.5°C	19.7°C	23.4°C
20 August	22.3°C	20.9°C	20.2°C	23.2°C
21 August	20.5°C	20.3°C	20.3°C	23.6°C
22 August	20.3°C	20°C	20°C	23.7°C
23 August	20.8°C	20.4°C	20°C	24.2°C
24 August	20.5°C	20.7°C	19.8°C	24°C
25 August	20.4°C	21.2°C	20°C	23.6°C
26 August	20.2°C	22.2°C	20.1°C	23.9°C
27 August	20.1°C	22.4°C	20.1°C	24°C
28 August	19.9°C	22.4°C	19.9°C	23.7°C
29 August	19.8°C	22°C	19.8°C	24.1°C
30 August	19.5°C	22.1°C	19.5°C	23.9°C
31 August	19.4°C	22.5°C	19.4°C	23.8°C

Average water temperature in Grand Bend in August over a decade

2016	2017	2018	2019	2020
23.2°C	21.3°C	22.4°C	22°C	23°C

2021	2022	2023	2024	2025
22.8°C	22.5°C	21.4°C	21.8°C	21.2°C

Grand Bend sea state in August

Chart comparing the height of waves in Grand Bend in August 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.

Grand Bend 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 August. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

	Avr	Min	Max
Pinery	22°C	19.1°C	24.4°C
Lambton Shores	22°C	19.1°C	24.3°C
Ipperwash Beach	22°C	19.1°C	24.4°C
Port Franks	22°C	19.1°C	24.4°C
Bayfield	21.8°C	18.8°C	23.9°C
Kettle Point	22°C	19.2°C	24.7°C
Highland Glen	22°C	19.2°C	24.6°C
Kennedy Acres	22°C	19.2°C	24.6°C
Port Huron	21.9°C	19.3°C	24.8°C
Brights Grove	21.9°C	19.3°C	24.8°C

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Our report for Grand Bend 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.

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Date (day and month)

Water temperature: min 16°C

Average temperature Maximum temperature