March is a popular month to ask about Old Woman Bay because conditions can shift week to week along this coast. Expect the water near 4.0°C, with daily variation from wind, tides and recent storms. We refresh the live value from Open-Meteo Marine every hour, so the headline above always reflects the current state of the Lake Superior.
Old Woman Bay sea temperature in March — averages 4.0°C
The sea at Old Woman Bay in Canada averages 4.0°C during March, based on long-run climatology for the Lake Superior. Use the live reading below for today's actual water and the monthly grid to compare with the rest of the year.
Average sea · March
4.0°C
cold · Poor
Live water now
…
Recommended wetsuit
6/5/4mm hooded fullsuit or drysuit
At 4.0°C only experienced cold-water athletes should enter — full thermal protection required.
Monthly comparison
Cold — wetsuit recommended · Old Woman Bay
Can you swim at Old Woman Bay in July? — 16.0°C water16.0°CCan you swim at Old Woman Bay in August? — 17.0°C water17.0°CCan you swim at Old Woman Bay in September? — 15.0°C water15.0°CCan you swim at Old Woman Bay in October? — 11.0°C water11.0°CCan you swim at Old Woman Bay in November? — 8.0°C water8.0°CCan you swim at Old Woman Bay in December? — 5.0°C water5.0°C
Frequently asked questions
What is the average sea temperature at Old Woman Bay in March?
Old Woman Bay averages 4.0°C in March, based on long-run climatology for the Lake Superior.
Is the sea warm enough to swim at Old Woman Bay in March?
Not without thermal protection — a wetsuit is recommended at 4.0°C.
Do I need a wetsuit at Old Woman Bay in March?
A 4/3 mm full wetsuit, boots and neoprene cap are recommended.