Crete weather in November is unstable, ranging from sunny and warm days with about 20° C to some rainy,
cloudy and windy days with 10° C. It might be possible to comfortably swim in the sea until early November, since the water still is warm in some days. Rainfall in November is higher on the mountains and snow can be seen on the peaks. Tourism in Crete comes to an abrupt halt at around the first week of November and with it the end of the charter flights. If you plan to visit during November, accommodation must be chosen carefully and heating is essential. However the days can really be enjoyed, as when the sun does shine it can be really warm. The air is clear, the views spectacular & beaches are all yours!! Although the travel is a little more inconvenient (via Athens)

Crete is a large island, with significant variations in climate. The weather in Crete depends on the area.
The northern and southern coasts of the island have a difference in temperature. In the southern costal areas is warmer than the northern coastal areas. In the mountainous regions, is significantly cooler than on the island’s coasts. Even in the summer, weather conditions in mountainous Crete can be quite cool, but pleasant. The lush vegetation that makes Crete attractive to visitors can be attributed to the frequency of rainfall. Summers are dry, while from late fall to early spring rainfall is not uncommon. Tourists often decide on their vacation spot depending on the climate and weather in Crete. The southern and eastern regions of Crete tend to be warmer and drier than areas in mid, western and northern areas of Crete. A good example of this is the Lassithi. During the summer, the temperature in the southern coastal areas is approximately 3 degrees °C higher than in the northern areas.