The highest day temperature in May 2025 was 74°F. The lowest night temperature was 45°F. The average values for day and night temperatures during May were 65.3°F и 53.0°F respectivly.

The average sea surface temperature in May 2025 for Sveti Vlas was 60.2°F. The maximum and minimum values were 55.0°F and 63.6°F respectively.

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

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

The average wind speed in May is 7.9 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 Sveti Vlas in May is 10.1 hours.