May is a popular month to ask about Grand Haven State Park because conditions can shift week to week along this coast. Expect the water near 23.0°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 Great Lakes.
Grand Haven State Park sea temperature in May — averages 23.0°C
The sea at Grand Haven State Park in United States averages 23.0°C during May, based on long-run climatology for the Great Lakes. Use the live reading below for today's actual water and the monthly grid to compare with the rest of the year.
Average sea · May
23.0°C
warm · Excellent
Live water now
…
Recommended wetsuit
Rash vest or swimsuit
At 23.0°C most swimmers and surfers are comfortable in a swimsuit or thin rash top.
Monthly comparison
Yes — comfortable for most swimmers · Grand Haven State Park
Can you swim at Grand Haven State Park in June? — 26.0°C water26.0°CCan you swim at Grand Haven State Park in July? — 28.0°C water28.0°CCan you swim at Grand Haven State Park in August? — 28.0°C water28.0°CCan you swim at Grand Haven State Park in September? — 27.0°C water27.0°CCan you swim at Grand Haven State Park in October? — 25.0°C water25.0°CCan you swim at Grand Haven State Park in November? — 22.0°C water22.0°C
Frequently asked questions
What is the average sea temperature at Grand Haven State Park in May?
Grand Haven State Park averages 23.0°C in May, based on long-run climatology for the Great Lakes.
Is the sea warm enough to swim at Grand Haven State Park in May?
Yes, most swimmers find 23.0°C comfortable for unrestricted swimming.
Do I need a wetsuit at Grand Haven State Park in May?
Most swimmers don't need a wetsuit; a rash vest helps for longer sessions.