If this site could only publish one month guide, it would be this one. Our climate study recommends 59 of our destinations in September — nearly three times July's count — because September solves the Mediterranean's equation: the sea holds its annual maximum (it lags air temperature by six to eight weeks), the August crowd is back at work, the heatwave risk collapses, and prices drop 25–35% in the same fortnight.

The first half of the month is essentially August weather without August. The second half is still better than June. Here are ten from the fifty-nine, chosen to spread the map.

The ten for September

1. Ischia · 27°C · sea 25°C

Our favourite September island. The Italians leave after the first weekend, the thermal pools stop feeling like a queue, and the sea stays at 25 into October. Eat at the family places in Sant'Angelo and Forio — the full guide has names.

2. Santorini · 26°C · sea 24°C

The meltemi dies down, the light gets lower and better, and Imerovigli does its thing at two-thirds of the August rate. The Santorini guide explains why you're staying there and not Oia.

3. Milos · 26°C · sea 24°C

The Cyclades' best beaches (Sarakiniko's white rock, Kleftiko by boat) without Santorini's volume. September is when the rental scooters are available again and the boat tours have space.

4. Bodrum · 30°C · sea 25°C

The Turkish coast exits its heat-flag months and lands here: properly warm, dry, with the Aegean at full temperature. Lira pricing still makes the mid-range absurd value — price in euros and double-check the total anyway.

5. Menorca · 26°C · sea 25°C

The quiet Balearic finally gets the recognition gap it deserves: Cala Macarella-class beaches, September sea like a pool, and none of Mallorca's airport crush. Hire a car; the best calas need one.

6. Faro and the Algarve · 26°C · sea 22°C

The Atlantic version of the September trade: warm land, cooler sea, empty boardwalks. The Ria Formosa ferry to Culatra — the best thing in the Faro guide — runs full schedule through September.

7. Taormina · 27°C · sea 25°C

Sicily in September is what the brochures pretend July is. The Greek theatre with Etna behind it, granita mornings, a sea you stay in until dinner. Palermo and the west make a fine second week.

8. Ksamil · 27°C · sea 24°C

The Albanian Riviera's poster cove, one month after the Instagram crowd leaves. Ionian water on a Greek-island budget. September is also when the Llogara pass drive is clearest.

9. Hvar · 26°C · sea 24°C

The Adriatic's see-and-be-seen island calms into something better: lavender hills, ferry-hop lunches on Vis, and the Pakleni islets to yourself by late month.

10. Zanzibar · 29°C · sea 26°C

Still dry, still steady, and now with the Mediterranean alternative fully priced back up, the long-haul maths gets interesting again. September is the last classic dry-season month before the short rains flirt with November.

Skip these in September

• Cancún, Punta Cana, Barbados. Peak hurricane season. A September Caribbean deal is cheap because it's a gamble — the study flags all three.
• Phuket and Krabi. The Andaman monsoon's wettest stretch. The Gulf side (Samui) holds on a little longer.
• Dubai. Still 39°C with humidity. Its season opens in November.

September fortnights move fast once the forecast firms up — the wheel shows which of the 59 are actually delivering this week, and every destination page pre-fills hotels and flights for its best window. Affiliate links throughout; same price for you, details on the disclosure page.

September's secret weapon is the water: the warmest sea in Europe peaks now — and the shoulder-season thesis explains why this month keeps winning.