Island Overview
Crete on 18 August 2026 is dry from coast to coast with no precipitation recorded or expected at any weather station. Temperatures peak between 28°C and 30°C island-wide, which is typical for mid-August. The most notable feature of the day is an unusual morning fog sitting over Heraklion, while the eastern and southern coasts enjoy clear to mainly clear skies from the start. Overnight lows varied considerably: Heraklion fell to 15.9°C while south-coast towns like Ierapetra, Sitia, and Makrigialos held above 21°C through the night.
North Coast vs South Coast
The north coast is the most varied today. Heraklion is under morning fog, an uncommon event in August that is likely caused by overnight sea humidity meeting cooler inland air from the mountains. It should thin and clear through late morning. Chania is the windiest point on the island, with gusts reaching 21 km/h, though skies there are mainly clear. Hersonissos and Malia both carry some cloud, with winds around 15 km/h.
The south coast is straightforward: Ierapetra and Sitia are under clear sky all day, and Makrigialos is mainly clear with the lightest winds on the island at under 12 km/h. If morning fog in Heraklion disrupts your beach plans, the south coast is a reliable alternative. Daytime highs are consistent across regions, from 28°C in Ierapetra to 30°C in Heraklion, Chania, and Elounda.
White Mountains and Psiloritis
Mountain zones will be noticeably cooler than the coast, with highs in the low-to-mid twenties at altitude and a fresh breeze throughout the day. The Samaria Gorge in the White Mountains is open for hiking. Start early: the lower section near Agia Roumeli becomes very exposed in the early afternoon heat, and the coastal exit can feel significantly warmer than the gorge interior.
Sea Conditions, Wind and UV
Sea temperatures range from 25.4°C off Sitia to 26.7°C in Heraklion Bay. Wave heights are calm to slight across the entire island, from 0.38 m at Makrigialos to 0.72 m off Sitia. Chania is the windiest coastal location at 21 km/h; beach umbrellas there should be properly anchored. Elsewhere winds are light, running between 12 and 15 km/h.
The UV index peaks between 7.8 and 8.1 across all stations, which falls in the high category. At these levels, unprotected skin can burn within 20 to 30 minutes at midday. Reapply sunscreen every two hours and cover up between noon and 15:00, particularly on open boat trips or walks without natural shade.
Swim Verdict
Conditions are good to excellent for swimming at all coastal locations today. The calmest water is at Makrigialos (0.38 m) and Ierapetra (0.42 m) on the south coast. Sitia sees the largest swell at 0.72 m, still well within safe limits for confident adult swimmers. Sea temperature is 25 to 27°C island-wide, warm enough for prolonged time in the water without discomfort.
Practical Tip for the Day
Heraklion visitors: hold off on your beach trip until at least 10:00. The fog should lift fully by late morning and the rest of the day will be clear. Wherever you are on the island, carry more water than you think you need. At 30°C with a UV index near 8, dehydration progresses quickly, especially on boat excursions and coastal hikes where shade is limited.
