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Greece weather in September: temperatures, sea and rain
In September Athens averages 20–29°C, with about 3 rain days. The sea around Athens and the islands is around 23–25°C. Warmest place in the table: Athens (up to 29°C). Thessaloniki: 16–27°C.
Temperatures, sea and rain in September
| Place | Temp (min–max) | Sea | Rain days | Rain (mm) |
|---|---|---|---|---|
| Athens | 20–29° | 24° | 3 | 10 |
| Thessaloniki | 16–27° | — | 4 | 25 |
| Crete (Heraklion) | 20–27° | 24° | 2 | 10 |
| Rhodes | 23–28° | 25° | 1 | 0 |
| Mykonos (Cyclades) | 21–26° | 23° | 2 | 10 |
| Santorini (Cyclades) | 21–27° | 24° | 1 | 15 |
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 September: can you swim?
Yes. In September the sea is warm: 23–25°C on average around Athens, Crete, Rhodes and the Cyclades.
What's open and on in September
- Peak tourist season. In Mykonos the beach clubs are open from late June to mid-September. (SantoriniDave)
- 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)
- Autumn and winter are storm season: in late September and early October 2026 Crete was under a red warning, with floods and 112 alerts. Check the weather warnings before you travel. Read more · Weather warnings
No Greek national holidays this month on our list. Holiday calendar
What to pack in September
- Light, breathable clothes, a hat, sunglasses and sunscreen.
- A water bottle for sightseeing: ancient sites have little shade.
- Swimwear: the sea is around 24°C.
Plan your trip
Common questions
What is the weather like in Greece in September?
In September Athens averages 20–29°C, with about 3 rain days. The sea around Athens and the islands is around 23–25°C. Warmest place in the table: Athens (up to 29°C). Thessaloniki: 16–27°C.
Can you swim in the sea in Greece in September?
Yes. In September the sea is warm: 23–25°C on average around Athens, Crete, Rhodes and the Cyclades.
How many rain days are there in Greece in September?
Athens has about 3 rain days on average in September. Most rain days in the table: Thessaloniki (4). Autumn and winter can also bring storms, so check the weather warnings before you travel.
Where is warmest in Greece in September?
By the averages in the table, Athens: up to 29°C by day. Coldest is Thessaloniki and the north: 16–27°C.
What should I pack for Greece in September?
Light, breathable clothes, a hat, sunglasses and sunscreen. A water bottle for sightseeing: ancient sites have little shade. Swimwear: the sea is around 24°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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