In April sea water temperature throughout Santorini is not yet warm enough for swimming and does not exceed 20°C. Based on average water temperature observations over the past ten years, the warmest sea in Santorini in April was 17°C (in Akrotiri), and the coldest water 16.9°C (in Thirasia). Santorini sees a regular influx of tourists, with the most crowds in the summer months between June and September. But the island is far from dead in winter; apart from the 15,000 locals who live in Santorini throughout the year, more travelers are recognizing that off-season is a great time to avoid the crowds and enjoy lower prices, and a growing number of hotels and restaurants stay open October in Santorini is a relatively hot and dry month. Temperature can be anything between 15-25 degrees Celsius (or 65-80 Fahrenheit) and it will be sunny most of the times. Sometimes, the temperature is around 25-30 degrees Celsius. You may get some rain for a few hours or a cloudy evening sometimes but in general you will be wandering the The best time to visit Naples is in the spring - mid-March to early-June - as the weather is dry and pleasant, neither too cold nor too hot. This time also beats the peak seasons so crowds are few, sightseeing is fun, and great deals on travel and lodging can be found. Hilltop view of Naples, Italy. The cost per day per person will range from 20 € to 40 € depending on preferences. Activities - 20 € per person. You can easily spend five days in Santorini in the winter with only 300 euro per person. Hotel rooms can go as low as 40 euro for a very respectable four-star hotel. Best Time to Visit the Greek Islands: The Greek islands are at their best from late May to early October for swimming, suntanning, and beach weather; and from April to early November for sightseeing, hiking, and exploring.A good travel itinerary for Greece should consider the weather patterns of the Greek islands.; Best Time to Visit Athens: Athens is a good year round destination. Average Temperature In Santorini In September. Graph Credit: Weather2Visit. The temperatures in Santorini in September range between average lows of 66°F/ 19°C and highs of around 77°F/ 25°C. Occasionally, temperatures may drop as low as 63°F/ 17°C and reach as high as 86°F/ 30°C. What's the Weather like in Santorini in November? The weather is still pleasant in Santorini, Greece, in November, even though the winter season for Greece is just around the corner.With an average of eight hours of sunshine a day, Santorini is still much more pleasant than the UK in November.This makes it a top pick when it comes to winter sun destinations. . November in Santoríni generally has pleasant temperatures, with moderate precipitation. You can expect pleasant maximum daytime temperatures of around 20°C (68°F) and nighttime temperatures around 17°C (62°F) in Fira . November is a moderate rainy month with an average rainfall of around 41mm (1.6 inches) in Fira . Visiting Santorini, Greece in December. 16°C (61°F) Air Temperature. 18°C (64°F) Sea Temperature. 6.5 Hrs of Sun / Day. 10.8 Days of Rain. December is a bit cold, and sunny but overcast at times. December is quite dry but with occasional showers, though there are many days without rain. EXwuf9.