Visiting and Travel in Greece. The weather in late Oct / early Nov is usually warm but you'll have about 1/3 rainy days. There is nothing special going on, apart from a national holiday (28th of October) and it being the olive harvest season (perhaps you will be interested if you are into agrotourism). If you want to come to the beach, come in September, because you 'll find the warmest waters, not very hot weather and empty beaches.