All About Crete Weather. Weather in Mirtos. This detailed 10 Day Weather Forecast in Crete for Mirtos/Myrtos, Lassithi Prefecture is prepared for the local ex-pat residents and holiday visitors. This is Mirtos Beach, Crete not to be confused with the resort of the same name in Kafalonia. Holidaymakers will find this Cretan coastal village is typical of those in Eastern Crete. It is charming, small and the main beach has a Blue Flag accreditation. Holiday Weather Tip: This is a place to holiday and recuperate or just chill out and re-charge batteries from the hectic pace of normal life even in winter when local temperatures seldom drop to single digits on the celsius scale. When in Mirtos try to make time to visit the local museum where Briton and local resident, John Atkinson, has re-created as a scale model of the Minoan ruins of nearby Fornou Korifi.