Ohio, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Willoughby, OH

Ocean temperature

In Willoughby, Ohio, in May, the average water temperature is 48.7°F (9.3°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.


In Willoughby, the average length of the day in May is 14.6h.

What is the water temperature in May in Willoughby?

In Willoughby, Ohio, the average seawater temperature in May is 48.7°F (9.3°C). Swimming in 48.7°F (9.3°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Willoughby have in May?

The average length of the day in May is 14.6h.
Average sea temperature in May - Willoughby, OH
  • Average sea temperature in May: 48.7°F

The best month for swimming (with the highest average sea temperature) is August (75.7°F).
The coldest month (with the lowest average sea temperature) is February (32.5°F).

Average daylight in May - Willoughby, OH
  • Average daylight in May: 14.6h

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.2h).