Kos weather by month & the best time to visit
Greece · beach resort · Mediterranean climate
The best time to visit Kos is July — its sunniest month (Sunshine Score 98/100), with August and June close behind. Kos averages about 3,218 hours of sunshine a year. Daytime highs around 26°C / 79°F and roughly 1 mm of rain in July.
When is the best time to visit Kos?
For sunshine, the best time to visit Kos is July, then August and June. The dullest month is January (37/100, 134 mm of rain). The full month-by-month picture is in the table below.
How sunny is Kos?
Kos is one of the sunniest places on Earth: about 3,218 hours of sunshine a year. 61 Sunshine Score points separate July (98) from January (37), so the month you pick matters. Kos is the sunniest of the 40 destinations tracked in Greece. Rain has a clear season: the wettest stretch, around January, carries about 57% of the annual 632 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 37 | 14° / 57°F | 12° / 54°F | 134 mm | 2 | 19° / 66°F |
| February | 40 | 14° / 57°F | 12° / 54°F | 99 mm | 3 | 18° / 64°F |
| March | 51 | 15° / 59°F | 13° / 55°F | 58 mm | 5 | 18° / 64°F |
| April | 69 | 17° / 63°F | 15° / 59°F | 37 mm | 6 | 18° / 64°F |
| May | 94 | 20° / 68°F | 18° / 64°F | 21 mm | 8 | 20° / 68°F |
| June | 97 | 24° / 75°F | 21° / 70°F | 5 mm | 9 | 23° / 73°F |
| July | 98 | 26° / 79°F | 23° / 73°F | 1 mm | 10 | 25° / 77°F |
| August | 98 | 27° / 81°F | 24° / 75°F | 1 mm | 9 | 26° / 79°F |
| September | 95 | 25° / 77°F | 22° / 72°F | 18 mm | 7 | 26° / 79°F |
| October | 90 | 22° / 72°F | 19° / 66°F | 43 mm | 5 | 25° / 77°F |
| November | 68 | 18° / 64°F | 16° / 61°F | 88 mm | 3 | 23° / 73°F |
| December | 44 | 15° / 59°F | 13° / 55°F | 127 mm | 2 | 21° / 70°F |
Sea temperature in Kos by month
The sea off Kos is warmest in August at around 26°C / 79°F, and coolest in February at 18°C / 64°F. The water sits at a comfortable 21°C or warmer roughly 7 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Head-to-head
How Kos compares month by month: Kos vs Rhodes · Kos vs Bodrum · Kos vs Samos · Kos vs Karpathos · all comparisons
Kos: questions and answers
What kind of destination is Kos?
Kos is a beach resort in Greece with a Mediterranean climate — the sea reaches 26°C at its warmest and is swimmable (21°C+) about 7 months a year.
How many hours of sunshine does Kos get a year?
Kos gets about 3,218 hours of sunshine a year, at its best around July.
When is the best time to visit Kos?
The sunniest time to visit Kos is July, when the Sunshine Score peaks at 98/100 (with August and June close behind). Expect daytime highs around 26°C / 79°F.
What is the least sunny month in Kos?
January is the least sunny month in Kos, scoring 37/100 with about 134 mm of rain.
Is Kos the sunniest place in Greece?
Yes — with about 3,218 hours of sunshine a year, Kos has the most annual sunshine of the 40 Greece destinations tracked by Sunshine Atlas.
What is the sea temperature in Kos?
The sea in Kos ranges from about 18°C (February) to 26°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Kos?
The typical midday UV index in Kos peaks around 10 (very high) in July, easing to about 2 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
Put the Kos sunshine badge on your site
A compact badge showing Kos's sunshine at a glance — free to embed under CC BY 4.0. Paste this wherever you'd like it to appear:
Live preview — this is exactly what your readers see: