SeasonMapSunny Beach weather in September
Bulgaria
September in Sunny Beach: warm, dry, with clean air — an excellent time to visit.
#3 of 12 months in Sunny Beach · #198 of 1383 destinations to visit in September · comfort 91/100 (tier S)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Sunny Beach in September
Other months in Sunny Beach
Sunny Beach's forum calls the first half of August reliably hot, with the back half cooling off enough at night that a light jacket is worth having. Regulars note the weather can still surprise you — some Augusts bring a run of heavy downpours lasting a few hours, even in what's normally the driest stretch of summer.
Add your own note from Sunny Beach's card on the map.
Sunny Beach climate normals — September
| Daytime high | 26°C / 78°F | 🌤 warm |
|---|---|---|
| Nighttime low | 17°C / 62°F | |
| Feels like (high) | 25°C / 77°F | |
| Sea temperature | 25°C / 76°F | 🙂 pleasant |
| Rainfall | 25 mm / 1 in | ☀️ dry |
| Rainy days | 5 days | |
| Humidity | 69% | 💧 humid |
| Dew point | 15°C / 58°F | |
| Sunshine | 10.6 h/day | |
| Daylight | 12.5 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Sunny Beach in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Busyschool holidays in 3 of the markets that fill it, one of its best months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Sunny Beach's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherSunny Beach's weather peaks July–September, best around August.
Best weatherFair weatherToughest weather
What's on in Sunny Beach in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Black Sea swimming season
15 Jun – 25 Sep · usuallySea warm enoughThe water is comfortable from the second half of June to late September, and the beach is shallow a long way out, which is why the package families come. September is the best of it.
Nearby, and something's on
Within 300 km of Sunny Beach — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Sunny Beach?
Sunny Beach in September — FAQ
- Is September a good time to visit Sunny Beach?
- September in Sunny Beach: warm, dry, with clean air — an excellent time to visit. It ranks #3 of 12 months for Sunny Beach on SeasonMap's comfort score (91/100).
- What is the weather like in Sunny Beach in September?
- In September, Sunny Beach averages a daily high of 25.5°C and a low of 16.8°C, with about 25.3 mm of rain over roughly 4.8 rainy days.
- What is the air quality in Sunny Beach in September?
- Sunny Beach has a mean US Air Quality Index of about 39 in September.
Other months in Sunny Beach
Compare Sunny Beach in September
Warmer or cooler than Sunny Beach in September
Similar destinations in Eastern Europe — September
Within 300 km: Bucharest's George Enescu Festival around 27 Aug – 26 Sep, and Istanbul's Sea warm enough to swim around 15 Jul – 30 Sep.