The highest day temperature in May 2025 was 80°F. The lowest night temperature was 41°F. The average values for day and night temperatures during May were 66.5°F и 53.6°F respectivly.

The average sea surface temperature in May 2025 for Sunny Beach was 60.3°F. The maximum and minimum values were 55.0°F and 63.4°F respectively.

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

Precipitation total in May for Sunny Beach is 1.8 in. It makes may one of the most rainy months of the year.

The average wind speed in May is 7.7 mph. This value is relatively stable throughout the year.

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 Sunny Beach in May is 10.1 hours.