Water temperature in St. Catharines (ON) in July

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Is it warm enough to swim in St. Catharines in July? Average water temperature in St. Catharines in July is 21.5°C and therefore suitable for comfortable swimming. The warmest water in St. Catharines in July is 26.1°C, and the coldest is 15.8°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in St. Catharines

Changes water temperature in St. Catharines in July 2025, 2024

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

Sea temperature

Tides

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 July	18.6°C	17.5°C	15.8°C	22.3°C
2 July	19.3°C	17.7°C	17°C	23.1°C
3 July	19.5°C	18.6°C	17°C	24°C
4 July	19.2°C	19.5°C	17.7°C	23.7°C
5 July	19.7°C	20.3°C	17.7°C	24.1°C
6 July	20.8°C	20.5°C	18.9°C	24.1°C
7 July	21.4°C	20.6°C	18.7°C	23.8°C
8 July	21.6°C	19.5°C	18.3°C	24.6°C
9 July	21.9°C	21.1°C	18.2°C	24.8°C
10 July	23.1°C	21.1°C	18.4°C	24.7°C
11 July	23.9°C	21.1°C	19°C	24.3°C
12 July	23.9°C	19.7°C	19.4°C	24.4°C
13 July	24.4°C	20.8°C	19.2°C	24.4°C
14 July	24.3°C	21.5°C	19°C	24.3°C
15 July	24.4°C	21.8°C	19°C	24.9°C

Day	2025	2024	Min	Max
16 July	24.6°C	21.9°C	18.7°C	25.2°C
17 July	23.6°C	22.1°C	17.9°C	26.1°C
18 July	22.5°C	22.2°C	17.8°C	25.9°C
19 July	22.6°C	21.9°C	18.2°C	25.5°C
20 July	23.1°C	22°C	18.4°C	24.1°C
21 July	23.5°C	21.9°C	19.7°C	24.1°C
22 July	23.4°C	22°C	19.9°C	23.9°C
23 July	23.4°C	22°C	19.7°C	23.5°C
24 July	23.2°C	22.4°C	19.4°C	23.2°C
25 July	23.5°C	23.1°C	19.4°C	23.5°C
26 July	23.5°C	22.3°C	19.3°C	23.5°C
27 July	24.6°C	23°C	19.7°C	24.6°C
28 July	24.5°C	22.7°C	18.6°C	24.5°C
29 July	24.6°C	23.1°C	18.4°C	24.6°C
30 July	24.9°C	23.8°C	18.2°C	24.9°C
31 July	24.6°C	24.8°C	18.4°C	24.8°C

Average water temperature in St. Catharines in July over a decade

2016	2017	2018	2019	2020
20.8°C	19.9°C	22.8°C	21.6°C	23.5°C

2021	2022	2023	2024	2025
20.8°C	20.4°C	22.1°C	21.4°C	22.8°C

St. Catharines sea state in July

Chart comparing the height of waves in St. Catharines in July 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.

St. Catharines 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 July. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

	Avr	Min	Max
Port Dalhousie	21.6°C	16°C	26°C
Grimsby	21.1°C	15.3°C	26.1°C
Fifty Point	21°C	15.3°C	25.9°C
Port Credit	20.1°C	13.3°C	25.2°C
Toronto Islands	20.3°C	13.6°C	25.3°C
Centre Island Beach	20.3°C	13.6°C	25.3°C
Toronto	20.5°C	14.2°C	25.3°C
Oakville	20.2°C	13.5°C	25.1°C
Hanlan's Point	20°C	12.8°C	25°C
Mississauga	19.8°C	12.9°C	24.8°C

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Our report for St. Catharines 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