Weather in Sunny Beach in August

How August compares

August is the 1st warmest month of the year in Sunny Beach and ranks 101st of 134 destinations we compare for August - see where else is hot in August. Against London's average high of 21.4°C in August, Sunny Beach is 6.0°C warmer by day and 7.2°C warmer at night.

Daytime and night-time in August

The typical August day in Sunny Beach peaks at 27.4°C, but that is an average: the warmest 10% of days reach 30.5°C or more. About 85% of days top 25°C and 1 in 7 pass 30°C. Nights average 20.7°C; one night in ten drops to 18.2°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest August day here reached 35.4°C (1994-08-12) and the coldest night 14.5°C (1993-08-31).

Rain in August

Some rain (4-8 rainy days): about 5 days with 1 mm or more, 31 mm in total. Year to year it varies a lot - the wettest August was 2004 with 130 mm, the driest 2010 with 2 mm. Humidity averages 70%.

Sea temperature in August

The sea averages 25.3°C - warm enough to swim (22°c+). Depending on the year it ranges from 24.2°C to 26.1°C. This is the warmest the sea gets here all year.

Sunshine and daylight

Around 10.2 hours of sunshine a day (estimated from cloud cover), 13.7 hours of daylight: the sun rises about 06:16 and sets about 20:11 local time in mid-August. Average cloud cover is 26%.

Is August a good time to visit Sunny Beach?

Yes - it is one of the better months: hot days, manageable rain and long sunny days. The best months for Sunny Beach on our scoring are August, July, June; months averaging 25°C or more: Jul, Aug.

Hot days, with little need for evening layers

August is Sunny Beach's warmest month, so it suits travellers who actively want heat rather than just mild weather. Around 85% of days reach 25°C, while 15% reach 30°C: properly hot afternoons are a possibility, but not the everyday expectation. Humidity averages 70%, which can make the warmth feel sticky, particularly when you're walking around at midday. Keep more active plans for the morning or later afternoon and use the hottest part of the day for shade and breaks. Light, breathable clothing should do most of the work, with a light layer handy for an occasional cooler evening.

Warm sea and plenty of time outdoors

The sea is a strong reason to choose August. At an average 25.3°C, it is warm enough for swimming rather than a quick, bracing dip. The year-to-year range of 24°C to 26°C also points to reliably warm water, though that does not tell you what waves or swimming conditions will be like on a particular day. Sunshine averages about 10.2 hours within 13.7 hours of daylight, giving you room to spread outdoor time across the day rather than concentrate it around noon. Pack swimwear, sun cream and a hat, and plan shade breaks even when the temperature feels manageable.

Some rain, so keep plans flexible

August is not reliably rain-free, but rain is unlikely to be the main feature of a typical holiday. There are about 5 rainy days during the month, so it makes sense to allow for wet weather without packing as though you're expecting a washout. A light waterproof is a sensible backup; heavy layers are less useful given the warm nights. The monthly averages cannot tell you when rain will arrive or how long it will last, so avoid assuming it will only fall overnight or pass quickly. Keep weather-dependent plans flexible and check the forecast before committing to a full day outside.