December weather forecast
Santorini, Greece

December marks the start of the winter season in Santorini, with cooler days, chilly nights, and teasing showers. The rainfall escalates to 102mm (4.02") over twelve days, setting indoor weather almost half the month. The shortest days of the year occur in December, with a mere 9.7 hours of daylight. A modest four hours of sunshine shines through mainly in the afternoon, illuminating the cloud blanket. A low UV index of 2 persists throughout, promising scarce risk of overexposure to the sun.

Temperature

December implies a soft temperature shift, with average high-temperatures reducing from November's refreshing 19°C (66.2°F) to a still comfortable 16°C (60.8°F). In Santorini, the December nights are characterized by an average low-temperature of 11°C (51.8°F), a minor dip from daytime readings.

Rainfall

In December, the rain falls for 12 days. Throughout December, 102mm (4.02") of precipitation is accumulated. Throughout the year, in Santorini, there are 65 rainfall days, and 554mm (21.81") of precipitation is accumulated.

Sea temperature

In Santorini, in December, the average water temperature is 17.6°C (63.7°F).
Note: Swimming in 17.6°C (63.7°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

Daylight

The month with the shortest days is December, with an average of 9h and 42min of daylight.
On the first day of December in Santorini, sunrise is at 07:11 and sunset at 17:03. On the last day of the month, sunrise is at 07:29 and sunset at 17:13 EET.

Sunshine

January and December, with an average of 4h of sunshine, are months with the least sunshine in Santorini.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.
Note: In December, the maximum UV index of 2 suggests these recommendations:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. To protect against the Sun's most potent rays, avoid direct exposure around midday. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.