Friday will be windy. A strong south wind will blow across Bulgaria and turn stormy in the east and on the northern mountain slopes. On the Black Sea coast the wind will come from the southwest, strong to stormy, and the sea will reach 3–4 on the sea scale.
Daytime highs will be 20C to 25C, and 27C to 28C where the south wind is strongest. Sofia will see about 21C. Morning temperatures will range from 11C to 16C, with about 12C in the capital.
Low cloud will cover the Upper Thracian Plain and the western Danube Plain in the morning. Mist will cut visibility, and there will be drizzle. Cloud will come and go during the day, and rain will arrive from the northwest in the evening.
On the Black Sea coast, highs will be 21C to 23C, and the sea is 16C to 18C. Cloud will come and go. Low cloud and poor visibility are expected in the morning, mostly along the southern coast.
It will be cloudier over the mountains, with light rain in places. A strong west-southwest wind will turn stormy on the high ground and northern slopes. At 1,200 metres above sea level, highs will be about 14C, and at 2,000 metres about 9C.
A cold front arrives on Saturday. A well-defined cold front will cross Bulgaria, and temperatures will fall sharply. The wind will pick up from the northwest, and cold air will move in from all sides. By the end of the day in the east, the wind will blow from the north-northeast.
Many places will see rain, moving from the northwest towards the southwest. Thunderstorms are possible in the south. Around 2pm, temperatures will be 6C to 11C in northern Bulgaria and on the high plains, and 13C to 18C in the south.
On Sunday the wind will ease, and by the end of the day it will blow from the southeast everywhere. It will be mostly cloudy, with light rain in a few places. Morning temperatures will be 0C to 5C and afternoon temperatures 7C to 12C, and warming will start again.
Monday and Tuesday will be mostly cloudy, with fog on the plains, and temperatures will keep rising.
Hourly forecast and the days ahead: Weather in Burgas →