Water temperature in Lake Saint-Jean (QC) in September

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Is it warm enough to swim in Lake Saint-Jean in September? Average water temperature in Lake Saint-Jean in September is 17.5°C and therefore is not suitable for comfortable swimming. The warmest water in Lake Saint-Jean in September is 21.6°C, and the coldest is 13.8°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Lake Saint-Jean

Changes water temperature in Lake Saint-Jean in September 2025, 2024

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

Sea temperature

Tides

Sunrise and Sunset

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Day	2025	2024	Min	Max
1 September	19.4°C	19.3°C	17.9°C	21.5°C
2 September	19.4°C	19.3°C	18.2°C	21.3°C
3 September	19.4°C	18.6°C	17.7°C	20.2°C
4 September	19.4°C	19.1°C	17.8°C	20.3°C
5 September	19.6°C	19°C	17.9°C	20.7°C
6 September	19.1°C	18.5°C	16.7°C	21.6°C
7 September	18.5°C	18.6°C	16.8°C	21°C
8 September	18.1°C	18.9°C	16.8°C	21.4°C
9 September	17.8°C	18.6°C	16.7°C	19.8°C
10 September	17.6°C	18.3°C	16.4°C	19.6°C
11 September	17.5°C	17.3°C	16.2°C	19.8°C
12 September	17.4°C	17.7°C	15.8°C	20.1°C
13 September	17.3°C	18°C	15.6°C	20.5°C
14 September	17.1°C	17.9°C	15.3°C	20.2°C
15 September	17.2°C	18°C	15.5°C	19.7°C

Day	2025	2024	Min	Max
16 September	17.4°C	18.3°C	15.6°C	18.5°C
17 September	17.3°C	18.2°C	15.5°C	18.9°C
18 September	17.3°C	19.2°C	15.2°C	19.2°C
19 September	17.2°C	19.6°C	15.3°C	19.6°C
20 September	16.6°C	17.7°C	15.4°C	18.3°C
21 September	16.1°C	18.1°C	15.2°C	18.4°C
22 September	16.3°C	19°C	14.7°C	19°C
23 September	16.1°C	18.6°C	14.5°C	18.6°C
24 September	15.8°C	18.2°C	14.1°C	18.2°C
25 September	15.9°C	17.8°C	14°C	18.2°C
26 September	15.9°C	17.4°C	14°C	18.2°C
27 September	16°C	17.3°C	14°C	17.8°C
28 September	15.7°C	16.6°C	13.8°C	17.5°C
29 September	15.6°C	17.8°C	13.9°C	17.8°C
30 September	15.3°C	17.2°C	13.9°C	17.3°C

Lake Saint-Jean water temp chart in September

Average water temperature in Lake Saint-Jean in September over a decade

2016	2017	2018	2019	2020
17.6°C	17.2°C	17.8°C	16.3°C	17°C

2021	2022	2023	2024	2025
17.9°C	17.6°C	18.6°C	18.3°C

Lake Saint-Jean 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 September. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

	Avr	Min	Max
Fjord du Saguenay	10.7°C	6.6°C	18.4°C
Baie Saint Paul	14.5°C	9.9°C	19.6°C
La Malbaie	11.3°C	7.2°C	15.4°C
Beaupre	17.3°C	12°C	23.3°C
Chateau Richer	17.2°C	11.8°C	23.4°C
Kamouraska	11.6°C	7.3°C	15.3°C
Riviere-du-Loup	10.2°C	6.6°C	14.1°C
Les Escoumins	8.2°C	3.9°C	13°C
Berthier sur Mer	17.5°C	12.2°C	23.8°C
Rimouski	8.5°C	4.7°C	13.9°C

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Our report for Lake Saint-Jean 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