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Greece weather in August: temperatures, sea and rain
In August Athens averages 24–33°C, with about 1 rain days. The sea around Athens and the islands is around 24–26°C. Warmest place in the table: Athens (up to 33°C). Thessaloniki: 21–32°C.
Temperatures, sea and rain in August
| Place | Temp (min–max) | Sea | Rain days | Rain (mm) |
|---|---|---|---|---|
| Athens | 24–33° | 25° | 1 | 5 |
| Thessaloniki | 21–32° | — | 2 | 15 |
| Crete (Heraklion) | 23–29° | 25° | 0 | 0 |
| Rhodes | 25–30° | 26° | 0 | 0 |
| Mykonos (Cyclades) | 23–28° | 24° | 0 | 0 |
| Santorini (Cyclades) | 24–30° | 25° | 0 | 0 |
Long-term averages in Celsius, from Climates to Travel (Athens, Thessaloniki and Heraklion: 1991–2020). “Rain days”: days in the month with precipitation. The source gives no sea temperature for Thessaloniki. These are averages, not a forecast: any year can bring heatwaves, cold spells or storms.
The sea in August: can you swim?
Yes. In August the sea is warm: 24–26°C on average around Athens, Crete, Rhodes and the Cyclades.
What's open and on in August
- Peak tourist season. In Mykonos the beach clubs are open from late June to mid-September. (SantoriniDave)
- Meltemi season: a northerly wind over the Aegean that blows for two to four days, sometimes for weeks. It can disrupt ferries between the islands. (Climates to Travel)
- The Athens Epidaurus Festival runs from May to October. At the ancient theatre of Epidaurus, performances are on Fridays and Saturdays in July and August. (Wikipedia)
Holidays and events
- 12 July 2027 – 31 August 2027 · Summer sales From the second Monday of July to the end of August, by law.
- 15 August 2027 · Dormition of the Virgin Mary Most shops closed and Athens empties. On the islands much stays open.
Greek holidays: full calendar
What to pack in August
- Light, breathable clothes, a hat, sunglasses and sunscreen.
- A water bottle for sightseeing: ancient sites have little shade.
- Swimwear: the sea is around 25°C.
Plan your trip
Common questions
What is the weather like in Greece in August?
In August Athens averages 24–33°C, with about 1 rain days. The sea around Athens and the islands is around 24–26°C. Warmest place in the table: Athens (up to 33°C). Thessaloniki: 21–32°C.
Can you swim in the sea in Greece in August?
Yes. In August the sea is warm: 24–26°C on average around Athens, Crete, Rhodes and the Cyclades.
How many rain days are there in Greece in August?
Athens has about 1 rain days on average in August. Most rain days in the table: Thessaloniki (2).
Where is warmest in Greece in August?
By the averages in the table, Athens: up to 33°C by day. Coldest is Thessaloniki and the north: 21–32°C.
What should I pack for Greece in August?
Light, breathable clothes, a hat, sunglasses and sunscreen. A water bottle for sightseeing: ancient sites have little shade. Swimwear: the sea is around 25°C.
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Sources
Information checked on 4 October 2026. Dates and opening hours change, so check before you travel.
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