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Mykonos is a good Cyclades diving base: wrecks (HMHS Britannic nearby), caves, Mediterranean fauna (groupers, barracudas). Season May to October.
| Month | Air (°C) | Sea (°C) | Wind (kts) | Waves (m) | Rain (mm) | Verdict |
|---|---|---|---|---|---|---|
| January | 12.1° | 15.6° | 13.6· 37% | 1.27 | 80 | Avoid |
| February | 12.7° | 15.7° | 13.7· 39% | 1.39 | 43 | Avoid |
| March | 13.7° | 15.6° | 13.2· 35% | 1.30 | 43 | Avoid |
| April | 16.1° | 16.5° | 11.2· 23% | 0.96 | 23 | Good |
| May | 19.5° | 18.2° | 10.7· 18% | 0.77 | 12 | Best |
| June | 23.4° | 21.5° | 11.5· 27% | 0.85 | 6 | Best |
| July | 25.7° | 25.0° | 15.4· 59% | 1.06 | 1 | Good |
| August | 25.9° | 25.5° | 15.0· 60% | 0.91 | 2 | Good |
| September | 23.7° | 23.5° | 13.3· 41% | 1.02 | 10 | Best |
| October | 20.1° | 22.2° | 13.0· 39% | 1.10 | 19 | Best |
| November | 17.0° | 20.5° | 12.6· 34% | 1.28 | 49 | Avoid |
| December | 13.9° | 17.6° | 13.1· 35% | 1.14 | 61 | Avoid |
Spring at Mykonos is an underrated diving season. From April to June, water rises gradually (17°C to 22°C), visibility is exceptional (25-30 m, one of the year's best), and crowds are absent. The ideal season for the most discreet sites, caves, accessible wrecks. 5 mm wetsuit in April, 3 mm in June. Rivage villas offer their best rates.
Summer at Mykonos is the diving high season. From June to August, water reaches 23-25°C, fauna in full activity (groupers, barracudas, sea bream), centres run at full capacity. Booking essential several weeks ahead. For intermediates, access to technical sites (wrecks, deep caves) after proper briefing.
Autumn anoints Mykonos as one of the best Mediterranean diving windows. September and October offer still-warm water (22-24°C), excellent visibility, thinning crowds, easing prices. Perfect season to combine diving and Cycladic art de vivre.
Winter at Mykonos isn't the diving season. For a visit, discover the island in its most authentic version.
Mediterranean winter. 13°C in the water, reduced visibility, mostly closed centres. Dead season.
Same as January.
Winter exit. 15°C in the water, first sites accessible with thick wetsuit (5/4 mm).
Resumption. 17°C, first exploitable window. Centres reopening. 5 mm wetsuit.
Excellent. 19°C, excellent visibility (25-30 m), absent crowds. Royal season for diving quality.
Spring peak. 22°C, first international visitors. Perfect season before tourist peak.
Summer. 24°C, warm water, fauna in full activity. Maximum centre attendance — booking essential.
Tourist peak. 25°C, conditions identical to July, saturated crowds.
The crown jewel. 24°C, thinning crowds, excellent visibility. Ideal quiet diving window.
Excellent. 22°C, last comfortable sessions, water still warm. Centres open early October.
Season's end. 19°C, few centres open.
Winter. Dead season.
Data: Open-Meteo (ERA5), period 2014-2023. Updated May 5, 2026.