Island in South Aegean, Greece
Kos weather by month and the best time to visit
When to go to Kos
May–June and September–October are warm with sea at swimming temperature. July–August is hot and packed; most beach businesses close from November to March.
Kos weather by month
Average daily high, rainfall and conditions.
- Jan14°152 mm
- Feb15°109 mm
- Mar17°63 mm
- Apr20°43 mm
- May24°24 mm
- Jun28°6 mm
- Jul32°2 mm
- Aug32°2 mm
- Sep29°20 mm
- Oct24°49 mm
- Nov20°95 mm
- Dec16°150 mm
Monthly averages
| Month | High | Low | Rain | Humidity | Conditions |
|---|---|---|---|---|---|
| January | 14°C58°F | 11°C51°F | 152 mm | 74% | Cool |
| February | 15°C59°F | 11°C52°F | 109 mm | 75% | Cool |
| March | 17°C63°F | 12°C54°F | 63 mm | 73% | Cool |
| April | 20°C68°F | 14°C58°F | 43 mm | 72% | Pleasant |
| May | 24°C75°F | 18°C64°F | 24 mm | 69% | Pleasant |
| June | 28°C83°F | 22°C71°F | 6 mm | 64% | Pleasant |
| July | 32°C89°F | 24°C75°F | 2 mm | 58% | Pleasant |
| August | 32°C90°F | 25°C76°F | 2 mm | 60% | Pleasant |
| September | 29°C83°F | 22°C72°F | 20 mm | 63% | Pleasant |
| October | 24°C76°F | 19°C66°F | 49 mm | 67% | Pleasant |
| November | 20°C68°F | 16°C60°F | 95 mm | 70% | Pleasant |
| December | 16°C61°F | 12°C54°F | 150 mm | 73% | Cool |
Best months across Greece
| Place | Best months | Warmest month |
|---|---|---|
| Athens | Apr–Jun, Sep–Oct | Jul (33°C) |
| Santorini | May–Jun, Sep–Oct | Aug (26°C) |
| Mykonos | May–Jun, Sep | Aug (25°C) |
| Crete | May–Jun, Sep–Oct | Aug (28°C) |
| Rhodes | May–Jun, Sep–Oct | Aug (32°C) |
| Corfu | May–Jun, Sep–Oct | Aug (30°C) |
| Thessaloniki | Apr–Jun, Sep–Oct | Jul (34°C) |
| Naxos | May–Jun, Sep–Oct | Aug (27°C) |
| Paros | May–Jun, Sep–Oct | Aug (27°C) |
| Zakynthos | May–Jun, Sep–Oct | Aug (29°C) |
| Chania | May–Jun, Sep–Oct | Jul (30°C) |
| Milos | May–Jun, Sep–Oct | Aug (26°C) |
| Kos | May–Jun, Sep–Oct | Aug (32°C) |
| Kefalonia | May–Jun, Sep–Oct | Aug (29°C) |
| Meteora | Apr–May, Sep–Oct | Jul (36°C) |
| Halkidiki | Jun–Sep | Jul (29°C) |
| Ios | Jun–Sep | Aug (26°C) |
| Lefkada | May–Jun, Sep–Oct | Aug (31°C) |
| Nafplio | Apr–Jun, Sep–Oct | Jul (36°C) |
| Skiathos | Jun–Jul, Sep | Aug (28°C) |
| Hydra | May–Jun, Sep–Oct | Aug (28°C) |
| Peloponnese | Apr–Jun, Sep–Oct | Aug (33°C) |
| Thassos | Jun–Jul, Sep | Aug (33°C) |
Quick answers
What is the best month to visit Kos?
May–Jun, Sep–Oct. May–June and September–October are warm with sea at swimming temperature. July–August is hot and packed; most beach businesses close from November to March.
When is the rainy season in Kos?
Rain peaks in January with about 152 mm. Months with 150 mm or more: Dec–Jan.
What is the hottest month in Kos?
August, with average highs of 32°C (90°F).
How cold does Kos get?
The coolest nights are in January, averaging 11°C (51°F).
More about Kos
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Sources
Climate averages are modelled from NASA POWER (MERRA-2) for 2001–2020 at about 50 km resolution, so coasts and valleys can differ a little. Compiled and reviewed by SoloSquare. How we compile and score this. Spotted something out of date? Tell us.