Island Overview
September opens across Crete with zero precipitation, clear to mainly clear skies, and daytime highs ranging from 27.7°C in Sitia to 31.4°C in Makrigialos. It is a classic late-summer day: summer heat without the peak August intensity, UV still firmly in the high range, and sea temperatures holding above 26°C at every monitored location.
North Coast vs. South Coast
The sharpest contrast today is overnight temperatures. Northern cities cool after dark: Heraklion and Hersonissos drop to 21 to 22°C, which makes for comfortable sleep. The south coast holds its heat. Ierapetra bottoms out at 26.5°C and Makrigialos at 25.6°C, the combined effect of south-facing slopes and the Libyan Sea retaining warmth through the night. Daytime highs on the south coast push above 30°C with lighter winds than the north. Visitors choosing between coasts will find the south hotter and stiller; the north benefits from a steadier Aegean breeze that takes the edge off the heat.
Mountains
The White Mountains above Chania and the Psiloritis massif above Rethymno will be clear throughout the day. Gorge walkers should start early. The lower sections of Samaria and Imbros exit onto the south coast, where temperatures above 30°C build quickly by midday with little shade available.
Wind
Heraklion records the strongest gusts today at 24 km/h, consistent with residual meltemi flow along the north coast in early September. Chania is the calmest location at 12.5 km/h. The sheltered eastern bays of Agios Nikolaos and Elounda report just 11 km/h. Rethymno and the south coast sit in between at 16 to 22 km/h, enough to ease the heat but not enough to disrupt beach plans.
Sea Conditions and UV
Wave heights are uniformly low, between 0.26 m at Ierapetra and 0.82 m at Sitia. Sea temperatures range from 26.3°C at Makrigialos to 27.5°C at Rethymno, warm enough for extended swimming without a wetsuit. UV index peaks fall between 7.4 and 7.65 across all cities, placing today squarely in the High category. SPF 30 or above is the minimum; reapply after every swim.
Swim Verdict
Conditions are good across the island. Waves are small, the water is warm, and there are no adverse currents reported. The calmest spots are the sheltered bays of Elounda and Agios Nikolaos on the east coast and Ierapetra on the south. The north coast from Hersonissos to Malia has a light afternoon chop from the breeze, but nothing that affects swimming.
Practical Tip for the Day
UV intensity peaks between 11:00 and 15:00. Arrange shade or a midday break during those hours, particularly if you are on an exposed beach or hiking inland. A reef-safe SPF 30 and a wide-brim hat are not optional today. Bring more water than you expect to need, especially if you are walking gorges or spending time away from beach facilities.
