The highest day temperature in May 2025 was 80°F. The lowest night temperature was 52°F. The average values for day and night temperatures during May were 67.0°F и 59.9°F respectivly.

The average sea surface temperature in May 2025 for Bethany Beach was 60.7°F. The maximum and minimum values were 55.0°F and 64.4°F respectively.

Most of the days in May are gloomy but you can also expect sunny days.

Precipitation total in May for Bethany Beach is 1.0 in. It makes may one of the least rainy months of the year.

The average wind speed in May is 11.7 mph.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Bethany Beach in May is 6.7 hours.