Halkidiki is a coastal area of Greece on the Aegean Sea, with 21 tracked beaches. The sea here ranges from about 15°C in the coolest month to 26°C at the summer peak, with roughly 7 months a year sitting above 20°C — the level most swimmers describe as pleasant without a wetsuit. Use the beach list below to check the current sea temperature at each spot before you head out.
Halkidiki
21 tracked beaches in Halkidiki, Greece, with live Aegean Sea temperatures.
Sea
Aegean Sea
Avg sea temp now
25.0°C
Best months
May – November
Best time to swim in Halkidiki
The sea in Halkidiki peaks in August, when the water averages around 26°C.
The main swimming season runs from May – November, when surface temperatures stay comfortable for extended sessions.
On average, 7 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like April and December are noticeably cooler but often quieter, with fewer crowds and steadier weather.
Outside peak season the water drops toward 17°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically February at around 15°C, when cold-water swimmers dominate the coast.
Halkidiki sea temperature history
Long-term climatology for Halkidiki shows an annual mean sea temperature of 20°C, ranging from 15°C in winter to 26°C at the summer peak.
The seasonal swing is roughly 11°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Halkidiki, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Jan
16°C
Feb
15°C
Mar
15°C
Apr
17°C
May
20°C
Jun
23°C
Jul
25°C
Aug
26°C
Sep
25°C
Oct
22°C
Nov
20°C
Dec
17°C
Values are area averages; individual beaches vary by exposure and depth.
Halkidiki sea temperature: frequently asked questions
What is the warmest month to swim in Halkidiki?
August is the warmest month in Halkidiki, when the sea averages about 26°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Halkidiki?
The coldest month in Halkidiki is typically February, when the water averages around 15°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Halkidiki without a wetsuit?
The main swimming season in Halkidiki runs from May – November — about 7 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Halkidiki?
Outside peak summer the water in Halkidiki drops toward 17°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Halkidiki?
The long-term annual mean sea temperature in Halkidiki is about 20°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Halkidiki?
The live reading at the top of this page shows the current sea temperature in Halkidiki, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Beaches in the Halkidiki
Ranked by current live sea temperature.
- 1Karydi BeachSithonia, Greece25.7°C
- 2KavourotrypesSithonia, Greece25.6°C
- 3Possidi BeachKassandra, Greece25.6°C
- 4Kryopigi BeachKryopigi, Greece25.5°C
- 5Vourvourou BeachVourvourou, Greece25.4°C
- 6Ammouliani BeachAmmouliani, Greece25.4°C
- 7KarydiVourvourou, Greece25.2°C
- 8Tigania BeachSithonia, Greece25.2°C
- 9Hanioti BeachHanioti, Greece25.2°C
- 10Lagomandra BeachSithonia, Greece25.1°C
- 11Kalithea Beach HalkidikiKalithea, Greece25.1°C
- 12Sani BeachSani, Greece25.0°C
- 13Sarti BeachSarti, Greece25.0°C
- 14Sani BeachSani, Greece24.9°C
- 15Pefkohori BeachPefkohori, Greece24.8°C
- 16Pefkochori BeachKassandra, Greece24.7°C
- 17Kallithea BeachKassandra, Greece24.6°C
- 18Kalamitsi BeachKalamitsi, Greece24.6°C
- 19Nea Fokea BeachNea Fokea, Greece24.5°C
- 20KavourotrypesSithonia, Greece24.4°C
- 21Polychrono BeachPolychrono, Greece24.3°C
Swimming in the Halkidiki — FAQ
How warm is the sea in the Halkidiki in September?
The Aegean Sea off the Halkidiki averages about 25.0°C in September, based on long-term monthly averages for this coast.
When is the best time to swim in the Halkidiki?
The Halkidiki is warmest in August (around 26.0°C) and coldest in February (around 15.0°C). There are typically 5 months a year when the water sits above 22°C.
What is the average yearly sea temperature in the Halkidiki?
Across all twelve months, the sea in the Halkidiki averages about 20.1°C.
Do you need a wetsuit to swim in the Halkidiki?
In peak season (around August, ~26.0°C) most swimmers are comfortable without a wetsuit. Outside summer, when the water drops toward 15.0°C, a 3/2mm to 5/4mm wetsuit is recommended.