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

May weather forecast and climate
Ashtabula, OH

Ocean temperature

In Ashtabula, Ohio, the average seawater temperature in May is 47.8°F (8.8°C).
Note: Swimming in 47.8°F (8.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.


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

How cold is the water in May in Ashtabula?

In Ashtabula, in May, the average water temperature is 47.8°F (8.8°C). Swimming in 47.8°F (8.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Ashtabula have in May?

In May, the average length of the day in Ashtabula is 14.6h.
Average sea temperature in May - Ashtabula, OH
  • Average sea temperature in May: 47.8°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 (32.7°F).

Average daylight in May - Ashtabula, 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).