Your September weather guide
WarmWeather in Sunny Beach in September
Yes - Sunny Beach in September suits a beach holiday if you prefer warmth to intense heat and can accept some rain. Average daytime highs are around 23°C, nights fall to around 17°C, and the sea averages 22.6°C, warm enough for swimming. The catch is that hot beach weather is not guaranteed every day. Pack for comfortable afternoons outdoors, but leave room for a light layer and a rain jacket.
Long-term climate averages for Nesebar (adjacent), not a forecast · 1991-2020
Sunny Beach, month by month
Your snapshot
At a glance
The useful details for Nesebar (adjacent).
- Average daytime high
- 23.1°C
- 9 in 10 days stay below 27°C
- Average night-time low
- 16.9°C
- coldest 10% of nights: 13°C or lower
- Compared with London
- +4.5°C
- London averages 18.6°C in September
- Sea temperature
- 22.6°C
- year to year: 22°C to 24°C
- Sunshine per day (est.)
- 7.3h
- 59% of 12.3 h of daylight
- Rainy days (1 mm+)
- 7
- 58 mm over the month
- Humidity
- 71%
- Days over 25°C
- 31%
- 1% over 30°C
- Record high 1991-2020
- 32.8°C
- 2015-09-06
- Record low 1991-2020
- 9.3°C
- 2018-09-26
- Flight from London
- ≈ 3 h 36 min
- 2304 km, short-haul (estimate for a direct flight)
Records are observed extremes within 1991-2020, not typical holiday conditions. Warm-day percentages are shares of days, not day counts.
How September compares
September is the 4th warmest month of the year in Sunny Beach and ranks 121st of 134 destinations we compare for September - see where else is hot in September. Against London's average high of 18.6°C in September, Sunny Beach is 4.5°C warmer by day and 5.7°C warmer at night.
Daytime and night-time in September
The typical September day in Sunny Beach peaks at 23.1°C, but that is an average: the warmest 10% of days reach 26.9°C or more. Roughly 1 in 3 days top 25°C and 1 in 111 pass 30°C. Nights average 16.9°C; one night in ten drops to 13.4°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 32.8°C (2015-09-06) and the coldest night 9.3°C (2018-09-26).
Rain in September
Some rain (4-8 rainy days): about 7 days with 1 mm or more, 58 mm in total. Year to year it varies a lot - the wettest September was 1999 with 292 mm, the driest 1992 with 4 mm. Humidity averages 71%.
Sea temperature in September
The sea averages 22.6°C - warm enough to swim (22°c+). Depending on the year it ranges from 21.6°C to 23.7°C. For the warmest sea here, come in August (25.3°C).
Sunshine and daylight
Around 7.3 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 06:49 and sets about 19:20 local time in mid-September. Average cloud cover is 41%.
Is September a good time to visit Sunny Beach?
It is a reasonable choice: warm days. The best months for Sunny Beach on our scoring are August, July, June; months averaging 25°C or more: Jul, Aug.
Warm afternoons, with a cooler edge after dark
September is a good fit if you want to spend time outside without relying on strong heat. Days reach 25°C about 31% of the time, while 30°C is rare at just 1%, so expect warmth rather than a consistently hot holiday. Light clothes should suit typical afternoons, though you will want something warmer when sitting outside in the evening. The coldest nights can fall to 13.4°C or below, making a jumper and long trousers sensible additions. Keep sun protection handy even when the air feels mild, and make the most of warmer afternoons rather than assuming every day will feel like summer.
Swimming weather, but keep beach plans flexible
The sea is a stronger reason to go than the promise of constant sunshine. At an average of 22.6°C, it is warm enough for swimming, although getting out may feel cool if the air is fresh. Sunshine averages about 7.3 hours a day, leaving useful time for the beach without suggesting clear skies throughout. There are about 6 rainy days, so a beach-only plan needs some flexibility. Take a light waterproof and clothes you can put on over swimwear, and use the local forecast to choose your swimming time. September suits travellers happy to adjust their day; it is less convincing if uninterrupted sun is essential.
A little perspective
Sunny Beach through the year
September is highlighted. See how it compares with the rest of the year.
| Month | Day | Night | Sea | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| January | 6.6°C | 1.2°C | 7.0°C | 3.4 | 53 | 8 | 0% |
| February | 7.9°C | 1.9°C | 5.9°C | 3.8 | 47 | 7 | 0% |
| March | 10.8°C | 4.3°C | 6.7°C | 4.6 | 53 | 9 | 0% |
| April | 14.9°C | 8.0°C | 9.4°C | 6.0 | 45 | 8 | 0% |
| May | 20.0°C | 13.2°C | 15.6°C | 7.2 | 47 | 9 | 5% |
| Junebest | 24.6°C | 17.9°C | 21.3°C | 9.1 | 48 | 8 | 45% |
| Julybest | 27.2°C | 20.3°C | 24.3°C | 10.8 | 42 | 7 | 86% |
| Augustbest | 27.4°C | 20.7°C | 25.3°C | 10.2 | 31 | 5 | 85% |
| SeptemberSelected | 23.1°C | 16.9°C | 22.6°C | 7.3 | 58 | 7 | 31% |
| October | 18.0°C | 12.4°C | 18.5°C | 4.7 | 62 | 7 | 3% |
| November | 12.9°C | 7.7°C | 14.0°C | 3.6 | 55 | 7 | 0% |
| December | 8.1°C | 3.0°C | 9.8°C | 3.3 | 59 | 9 | 0% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
- Sea
Best months here
On warmth, low rainfall and sunshine, start with these.
Keep exploring
Similar in September
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
Croatia · 23°C by day · sea 23°C
Pula
France · 24°C by day · sea 23°C
Nice
Italy · 23°C by day · sea 23°C
Venice
Italy · 23°C by day · sea 23°C
Lido di Jesolo
Turkey · 24°C by day · sea 23°C
Istanbul
A little more detail
Sunny Beach in September FAQs
Plain answers, grounded in the averages.
Is Sunny Beach hot in September?
Sunny Beach is warm in September: the average daytime high is 23.1°C and nights average 16.9°C. Roughly 1 in 3 September days reach 25°C.
Can you swim in the sea in Sunny Beach in September?
The sea around Sunny Beach averages 22.6°C in September, which is warm enough for most people to swim comfortably. Between 1991 and 2020 it ranged from 22°C to 24°C depending on the year.
How much does it rain in Sunny Beach in September?
Sunny Beach sees about 7 rainy days (1 mm or more) and 58 mm of rain in a typical September. The wettest September between 1991 and 2020 was 1999 (292 mm) and the driest was 1992 (4 mm).
How sunny is Sunny Beach in September?
Sunny Beach gets around 7.3 hours of sunshine a day in September out of 12.3 hours of daylight (estimated from average cloud cover).
How does Sunny Beach compare with the UK in September?
Sunny Beach is on average 4.5°C warmer than London by day in September (23.1°C against 18.6°C).
What is the hottest September on record in Sunny Beach?
Between 1991 and 2020 the hottest September day in Sunny Beach reached 32.8°C on 2015-09-06, and the coldest night dropped to 9.3°C on 2018-09-26.
Is Sunny Beach warmer than London in September?
Yes. Sunny Beach's average daytime high is 23.1°C, compared with 18.6°C in London - a difference of 4.5°C. That is a useful step up in warmth for time outdoors, but it does not mean every day will be hot.
Is September the best month for a hot holiday here?
September is warm rather than reliably hot. It ranks 4 among the resort's months for warmth, while August, July and June are the stronger overall choices. Choose September if gentler daytime temperatures appeal more than the best chance of heat.
Will the sea feel warm enough to swim?
The sea averages 22.6°C, with a year-to-year range of 22°C to 24°C, putting it in the swimming-friendly range. Personal comfort varies, so it may feel fresh at first rather than bath-warm. Have a dry layer ready for afterwards.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid) and NOAA Coral Reef Watch 5 km sea temperatures, 1991-2020
Averages computed from daily values at Nesebar (Nesebar (adjacent)). Sea temperature from the nearest 5 km sea cell, 2 km from that point. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C