Cyclades Weather Monthly 2026: The Complete Year-Round Guide
Why Cyclades Weather Matters More Than You Think
In mainland Greece you can visit almost any month. In the Cyclades, weather dictates experience. Meltemi winds cancel ferries. Sea temperature swings 12°C between April and September. Rain is rare but concentrated. Sun angle changes the caldera light.
This guide is the definitive month-by-month weather reference for the Cyclades 2026 — air, sea, rain, wind, sun hours, and what each month enables (or blocks).
Planning your trip? Book ferry tickets. Rent a car. Stay with Athina Luxury Suites, Mykonos.Luxury, or The ACE VIP.
TL;DR — The Weather Quickreference
Best Weather Months
- June — 26°C air, 22°C sea, 5 knots wind, 12h sun
- September — 28°C air, 24°C sea, 10 knots wind, 11h sun
- May — 22°C air, 18°C sea, 8 knots wind, 11h sun
Hottest Months
- July — 30°C air
- August — 31°C air
Warmest Sea
- August — 25°C (daytime)
- September — 24°C (consistent)
Windiest
- July–August — meltemi 20–35 knots
- February — winter northerlies
Rainiest
- December — 10–12 rain days
- January — 8–10 rain days
Cheapest (Weather-wise Still Functional)
- May — 30% off peak, 22°C, swimmable for strong swimmers
- Late September — 25% off peak, sea still 22°C
Month-by-Month Breakdown
January
- Air: 8–13°C, feels cool
- Sea: 15–16°C
- Rain: 8–10 days, 60mm total
- Wind: Variable, occasional strong northerlies
- Sun: 5–6 hours/day
- Open: 20–30% of tourist services
- Good for: Slow travel, food, local life
- Skip: Santorini specifically (many hotels closed)
February
- Air: 9–13°C
- Sea: 14–15°C (coldest)
- Rain: 7–9 days
- Wind: Strongest winter winds
- Sun: 6 hours/day
- Vibe: Quietest month
- Hotels: Limited
- Skip: Most travelers — too unstable for leisure
March
- Air: 10–15°C
- Sea: 14–15°C
- Rain: 6 days, dropping mid-month
- Wind: Variable
- Sun: 7 hours/day
- Vibe: Awakening, almond blossom
- Open: 30–40% of services
April
- Air: 14–19°C
- Sea: 15–17°C
- Rain: 4 days, mostly early month
- Wind: Mild
- Sun: 8 hours/day
- Vibe: Pre-season, Greek Easter (April 12, 2026)
- Open: 60–70% of tourist services
- Good for: Hikers, photographers, Easter travelers
May
- Air: 20–23°C
- Sea: 17–19°C (cool for casual swimmers)
- Rain: 2–3 days
- Wind: 5–12 knots, mostly pleasant
- Sun: 10 hours/day
- Vibe: Shoulder magic, discounted
- Open: 90% by month-end
- Good for: First-timers on budget, Athina Luxury Suites at 30% off
June
- Air: 25–28°C
- Sea: 21–23°C (comfortable)
- Rain: 1–2 days
- Wind: 5–15 knots
- Sun: 12 hours/day
- Vibe: Sweet spot for balanced trips
- Open: 100%
July
- Air: 28–31°C
- Sea: 24°C (warm)
- Rain: <1 day
- Wind: Meltemi building, 15–25 knots
- Sun: 13 hours/day
- Vibe: Peak scene
- Open: 100%
- Meltemi alert: Late July ferry cancellations 2–5%
August
- Air: 28–32°C
- Sea: 25°C (warmest)
- Rain: <1 day
- Wind: Meltemi full — 20–35 knots
- Sun: 12 hours/day
- Vibe: Peak+, meltemi kites, full everything
- Meltemi alert: 5–10% fast ferry cancellations
- Family note: Ho, crowded but warmest sea
September
- Air: 26–29°C
- Sea: 24°C (perfect)
- Rain: 1–2 days
- Wind: 5–15 knots (meltemi fading)
- Sun: 11 hours/day
- Vibe: Sweet spot, thinning crowds
- Open: 100% through mid-month
October
- Air: 22–26°C early, 18–22°C late
- Sea: 23°C → 20°C (last swims first 2 weeks)
- Rain: 3–5 days
- Wind: Mild
- Sun: 9 hours/day
- Vibe: Golden hour, dramatic light
- Open: 80% first 2 weeks, closing to 40% by end
November
- Air: 15–19°C
- Sea: 18–19°C
- Rain: 6–8 days
- Wind: Variable, occasional storms
- Sun: 7 hours/day
- Open: 30% of services
- Vibe: Transitional, for slow travelers
December
- Air: 11–15°C
- Sea: 16–17°C
- Rain: 10–12 days (wettest)
- Wind: Winter northerlies
- Sun: 5 hours/day
- Open: 20–30%, Christmas markets in Naxos/Paros
- Vibe: Quiet, for locals mostly
Weather by Island (Key Differences)
Santorini
- Microclimate: Slightly hotter in summer, cooler in winter than average
- Wind-sheltered in caldera, exposed on back side
- Rare volcanic haze days
Mykonos
- Most wind-exposed island
- Meltemi hits hardest here
- Humidity lower than Athens
Paros / Naxos
- Milder than Mykonos by 2–3 knots wind
- Paros cherry blossom early May
- Naxos mountain villages cooler year-round
Milos / Sifnos
- Sheltered from meltemi on southern coast
- Slightly drier than Mykonos/Santorini
Meltemi: The Meteorology of the Cyclades
Meltemi is the dry northerly wind that blows in summer. Strongest July–August, 20–35 knots typical. Effects:
- Fast ferry cancellations (5–10% in August)
- Beach closures on windward coasts
- Cooler air than expected
- Clear skies (no clouds, dry)
How to plan around it:
- Never book international flight home within 24h of last ferry
- Use leeward beaches on windy days (south coast of most islands)
- Download Ferryhopper app for real-time cancellation alerts
- Book flexible ferry tickets where possible
Packing by Season
May–June
- Light linen, light jacket for evening, wetsuit if swimming seriously, hiking shoes
July–August
- Linen everything, swim gear, sunscreen, hat, one smart outfit for dinner
September–October
- Mix of summer + light jumper, swimwear first half, sun hat
November–April
- Layers, waterproof shell, scarf, closed shoes
Frequently Asked Questions
Can I swim in May?
Strong swimmers yes. Casual — wetsuit recommended.
When is the sea warmest?
August (25°C) and September (24°C).
Worst weather month?
December (wettest) or February (coldest).
Is April warm enough for beach days?
Borderline. Air yes (18°C), sea too cold.
Does it rain in summer?
Rarely. July/August often go weeks without rain.
When does meltemi start?
Late June, peaks August, fades mid-September.
Can meltemi cancel flights?
Rarely. Usually only ferries.
Best month for photography?
October (dramatic light) or May (soft shoulder tones).
Does it snow?
Extremely rare, only at higher elevations (Naxos mountains).
Is it humid?
Drier than mainland. August 50–60% humidity.
Winter ferries?
Blue Star runs year-round. Fast ferries mostly May–October.
UV index summer?
9–11 (very high). Sunscreen SPF 50.
Sea temperature predictable?
Yes, very consistent year-to-year.
Greek Easter weather 2026 (April 12)?
16–18°C, sea 15–17°C, mild.
Wedding weather month?
June or September.
Does elevation matter?
Yes, Santorini caldera 250m higher than shore — cooler, breezier.
Is evening cool in summer?
Yes, 5–7°C drop after sunset. Bring light layer.
Hurricanes / typhoons?
No — Aegean never sees tropical systems.
The Insider's Final Word
Cyclades weather is predictable and kind to travelers who respect its calendar. June and September are objectively the best months. May and October are the budget-smart shoulders. Avoid mid-January to mid-March unless you want to experience Greek winter. Plan around meltemi in August.
Book with anchor partners — Athina Luxury Suites, Mykonos.Luxury, The ACE VIP — who adjust concierge services seasonally. Ferry tickets 4–8 weeks out. Car rental always recommended.
