Sveti Vlas Weather in September

Sveti Vlas in September sees high temperatures, with highs around 24°C (75°F) and overnight lows of 17°C (63°F). Rainfall is fairly high at around 63 mm (2.5 in) on average, so pack waterproofs just in case.

Rainfall in Sveti Vlas in September

Typically, about 4 days will experience rainfall, with an average of 63 mm (2.5 in) for the month. Rainfall tends to arrive in short, intense showers this month. Rain days are few, but the showers can be surprisingly heavy.

Temperature in Sveti Vlas in September

Sveti Vlas has perfect weather in September, with days reaching 24°C (75°F) and nights cooling to 17°C (63°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights cool down to 17°C (63°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Sveti Vlas in September

Expect a lot of sunshine this month, with about 246 hours of sun. These sunny conditions add to the overall experience.

Average water temperature in September

The water is 24°C (75°F) this month — warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July, August and September typically offer the best weather for Sveti Vlas.

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For a detailed overview over the year and the best time to visit Bulgaria, check out our Sveti Vlas's climate page.

Sveti Vlas Temperature in September

Min Temperature 17°C (63°F)  

Max Temperature 24°C (75°F)  

Water Temperature 24°C (75°F) *  

Chance of Rain 15%  

Precipitation 63 mm (2.5 in)  

Rainy days 4 days  

Humidity 72% *  

Sunshine 246 hours *  

Percentage Sunshine *  

* Data from: Sunny Beach, Bulgaria (5 KM, 3 Miles).

Daily Historical Temperatures

49-year average (1976-2025)

Based on our historical records, temperatures in Sveti Vlas typically drop from around 26°C (79°F) at the start of September to approximately 22°C (72°F) by the end. Nights are pleasant, with lows typically ranging from 12°C (54°F) to 16°C (61°F).

Average temperatures in September

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Daily Historical Precipitation

49-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Sveti Vlas in September

Browse day-by-day weather records for Sveti Vlas spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Sveti Vlas historical weather extremes in September

Based on 28 years of weather observations (1997-2025), these are the most extreme conditions recorded in Sveti Vlas.

• Sveti Vlas recorded its highest September temperature of 35°C (95°F) on September 16, 2022.
• On September 21, 2007, Sveti Vlas saw its coldest September day with temperatures maxing out at 13°C (55°F).
• Sveti Vlas registered its coldest September night on September 23, 1997, with temperatures dropping to 3°C (37°F).

What to Wear in Sveti Vlas in September

Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. With water temperatures around 24°C (75°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Sveti Vlas in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

10/10

Walking

10/10

Barbeque

8/10

Camping

8/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Bulgaria, check out our Sveti Vlas's climate page.

More climate data for Sveti Vlas

Temperature Rainfall Sunshine Humidity Water Temp

See the full Sveti Vlas climate overview or explore weather in Bulgaria.