Kos weather in August

August in Kos: sweltering, dry, with muggy air — fine if you can take 35°C afternoons.

Updated September 2026 · climate normals from ERA5 reanalysis

Kos🇬🇷 Greece · Greece & Cyprus · Island90
  1. 54Jan
  2. 65Feb
  3. 72Mar
  4. 78Apr
  5. 83May
  6. 91Jun
  7. 88Jul
  8. 90Aug
  9. 93Sep
  10. 87Oct
  11. 70Nov
  12. 57Dec

#3 of 12 months in Kos · #235 of 1413 destinations to visit in August · comfort 90/100 (tier S)

Days
31°C
Nights
24°C
Wet days
0
Sun
12.5 h
Humidity
76%
Daylight
14 h
Kos, Greece
Photo: Wolfgang Weiser · Pexels

Traveller notes on Kos in August

Notes from nearby Bodrum (20 km away)

Kos doesn't have its own notes for August yet — these are about Bodrum, close enough to share the season.

August in Bodrum runs 35 to 37C and sometimes higher, and the forum's advice is about where you sleep rather than whether to come. The peninsula gets a steady sea breeze with comparatively low humidity, and the far tip has it all day; Bodrum town itself, with narrow streets and close-packed buildings, is the part people describe as stifling after dark, so the coastal villages are the recommendation. Gumbet is windy most of the summer, which regulars treat as a relief rather than a complaint. July and August are the busiest months of the year; September is the alternative they offer. The record: 31.9C days that feel like 36C, 25.4C nights, 0.6 precipitation days, 12.5 hours of sun, a 26.7C sea and a 21 kph breeze.
PeninsulaBreezeNotTown · August · 1 month ago · about Bodrum · Read more on Tripadvisor ↗

Other months in Kos

Forum posters describe March in Kos as genuinely unpredictable but still mild overall, sitting outside the reliably hot, dry stretch that runs roughly June through early October. Posters note showers this time of year can affect one side of the island while leaving another completely dry, reflecting how localized spring weather patterns can be here. Posters consistently recommend packing layers and a light raincoat for a March visit, ready for both sunny stretches and passing rain within the same trip. Posters generally rate March as a mild, changeable shoulder-season month for Kos, well ahead of the settled summer heat but past the harshest of the Aegean winter.
Tripadvisor community · March · 1 month ago · Read more on Tripadvisor ↗
September is the month Kos regulars call the best of the year — 25 to 30°C, the sea still at 27°C, everything open, and nowhere near July and August's crowds. Evenings want a cardigan. The thing to understand about the wind is that it is directional rather than seasonal: the meltemi is a northerly running June to about mid-September, so it hits the north coast hardest — Tigaki and Mastihari especially — and the forum's fix is simply to switch sides of the island, Kardamena being the usual suggestion. Kos reads breezy year-round on the monthly averages, but an average smooths over exactly the local, directional effect regulars are describing, so take the coast advice over the number. In the heat most people count it a cooling breeze rather than a problem.
Tripadvisor community · September · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Kos's card on the map.

Kos climate normals — August

Daytime high31°C / 88°F🔥 sweltering
Nighttime low24°C / 76°F
Feels like (high)35°C / 95°F
Sea temperature27°C / 80°F😎 warm sea
Rainfall0 mm / 0 in☀️ dry
Rainy days0 days
Humidity76%💦 very humid
Dew point21°C / 69°F
Sunshine12.5 h/day
Daylight13.5 h
Wind30 km/h / 19 mph
Air quality (US AQI)81🙂 moderate

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Kos in August

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

Peak crowdsCharter and resort season, Summer holidays in Greece, school holidays in 7 of the markets that fill it(estimated)

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Peak crowdsBusyShoulder seasonQuiet

Best months for Kos's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Best weatherKos's best weather comes in June, August and September — separate windows, not one continuous season.

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Best weatherFair weatherToughest weather

What's on in Kos in August

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Season

    Charter and resort season

    1 May – 15 Oct · usuallySummer season opensCrowded

    Kardamena, Tigaki and Mastichari run on northern European charter flights, and the hotels, bike hire and beach bars open and close with them. Outside the season the airport goes back to a couple of Athens flights a day.

  • Season

    Sea warm enough

    15 Jun – 31 Oct · usually

    The Aegean here is comfortable from late June and holds into October, well after the charter flights thin. The hot springs at Therma warm a corner of the sea year round.

  • Season

    Meltemi

    15 Jun – 15 Sep · usuallyWind seasonRisk

    The northerly blows hardest through July and August, which is why the windsurf schools are on the north coast and the sheltered swimming is at Kefalos and Paradise in the south. It also cancels the small boats to Nisyros.

What's on around the world in August →

Nearby, and something's on

Within 300 km of Kos — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Kos?

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Kos in August — FAQ

Is August a good time to visit Kos?
August in Kos: sweltering, dry, with muggy air — fine if you can take 35°C afternoons. It ranks #3 of 12 months for Kos on SeasonMap's comfort score (90/100).
What is the weather like in Kos in August?
In August, Kos averages a daily high of 31.1°C and a low of 24.4°C, with about 0.3 mm of rain over roughly 0.1 rainy days.
What is the air quality in Kos in August?
Kos has a mean US Air Quality Index of about 81 in August.

Within 300 km: Bodrum's Bodrum Ballet Festival around 1–25 Aug, and Rhodes' Moths at Petaloudes around 15 Jun – 15 Sep.