Oia, perched on Santorini’s cliffs, enjoys a classic Mediterranean climate with hot, dry summers and mild, wetter winters. Summer highs reach 27–30°C, while winter days average 14–16°C. Rain is rare from May to September, but sunshine is abundant year-round, making Oia a favourite for sunseekers, sunset lovers, and those chasing the island’s iconic blue skies.
The best times to travel section shows how the months compare for a visit, so you can find the time of year that fits what you want to do.
Background colours of the months:
The colour shows the typical temperature: yellow (hot), green (mild) and blue (cold). How strong the colour is shows the travel season: full colour means high season, soft colour means shoulder season and soft-striped means off season.
Weather symbols:
Each month has one symbol showing what the weather is typically like, such as hot and sunny, freezing or a rainy or snowy season. Use them to quickly spot months that match the weather you want, or to avoid the ones that don't.
Crowdedness:
The people icon shows how busy the place usually is. The more people, the more crowded it gets.
Additional notes:
The grey info boxes point out special things worth knowing, like recurring weather issues or seasonal events.
Oia’s climate is shaped by the Aegean Sea, bringing long, hot, and dry summers from late May to September. During this period, average daytime highs reach 27–30°C, with July and August being the hottest and sunniest months. Rainfall is minimal in summer – often less than 2 mm per month – and humidity hovers around 60–65%. Evenings are warm, and the famous meltemi wind can bring refreshing breezes, especially in July and August, though it sometimes gets quite gusty. Sunshine is plentiful, with up to 13–14 hours of daylight in June and July, and sea temperatures peak at 24–25°C, perfect for swimming.
Winters (December–February) are mild but wetter, with average highs of 14–16°C and lows around 9–11°C. Rain is most frequent from November to February, with December and January typically seeing the highest rainfall (up to 70–80 mm monthly). Snow is extremely rare, and most winter days still enjoy 5–6 hours of sunshine. Spring (March–May) and autumn (late September–November) are transitional, offering pleasant temperatures (18–25°C), blooming landscapes, and fewer crowds. Winds are present year-round, averaging 18–26 km/h, with the strongest gusts in winter and early spring. Oia enjoys over 2,800 hours of sunshine annually, making it one of Europe’s sunniest destinations.
| Average climate data for Oia, Greece | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Average maximum temperature (°C) | 15 | 15 | 16 | 17 | 20 | 24 | 25 | 26 | 24 | 22 | 19 | 16 | 26 |
| Average minimum temperature (°C) | 13 | 13 | 14 | 16 | 19 | 22 | 24 | 25 | 23 | 21 | 18 | 15 | 13 |
| Average precipitation (mm) | 35 | 38 | 29 | 10 | 13 | 6 | 2 | 2 | 8 | 19 | 26 | 33 | 221 |
| Average rainfall days (days) | 14 | 12 | 10 | 7 | 6 | 3 | 1 | 0 | 4 | 7 | 9 | 14 | 87 |
| Average relative humidity (%) | 69 | 71 | 71 | 74 | 76 | 76 | 76 | 78 | 72 | 71 | 71 | 70 | 73 |
| Average wind speed (km/h) | 29 | 29 | 26 | 23 | 20 | 20 | 23 | 23 | 22 | 22 | 23 | 27 | 24 |
| Average water temperature (°C) | 16 | 15 | 15 | 16 | 18 | 21 | 23 | 24 | 23 | 21 | 19 | 17 | 19 |
| Average daily daylight hours (h) | 10 | 10 | 12 | 13 | 14 | 14 | 14 | 13 | 12 | 11 | 10 | 9 | 12 |
| Average daily sunshine hours (h) | 5 | 6 | 8 | 10 | 11 | 11 | 12 | 12 | 10 | 7 | 6 | 6 | 9 |
| Average cloud coverage (%) | 40 | 36 | 30 | 20 | 14 | 7 | 2 | 2 | 9 | 19 | 25 | 37 | 20 |
| Average UV index | 4 | 4 | 5 | 5 | 6 | 6 | 7 | 7 | 6 | 5 | 5 | 3 | 5 |
The best time to visit Oia is from late April to early June and mid-September to October. These shoulder seasons offer warm, sunny weather (20–27°C), fewer crowds, and lower prices than the summer peak. The sea is inviting for swimming, and the famous sunsets can be enjoyed in a more relaxed atmosphere. Spring brings blooming landscapes, while early autumn offers warm seas and golden light.
The least favourable time is July and August, when Oia is at its hottest (up to 35°C during heatwaves), most crowded, and accommodation prices are highest. Winter (December to February) is also less ideal for classic island experiences, as some hotels and restaurants close, rain is more frequent, and beach activities are limited – though the village is peaceful and atmospheric.
Oia has hot, dry summers (27–30°C), mild winters (14–16°C), and very little rain from May to September. Most rain falls from November to February, but sunshine is abundant in all seasons.
Snow is extremely rare in Oia due to its mild winter temperatures. On the rare occasion it does snow, it’s light and melts quickly, making it an unusual event for the island.
June to September are best for swimming, with sea temperatures of 23–25°C and plenty of sunshine. May and October can also be pleasant, though the water is cooler at the season’s edges.
Yes, Oia is windy year-round, especially in summer when the meltemi wind can be strong. Average wind speeds range from 18–26 km/h, providing a refreshing breeze but sometimes making the sea choppy.
Oia enjoys over 2,800 hours of sunshine annually. Summer months offer up to 13–14 hours of daylight, while even in winter, there are 5–6 hours of sun per day.
Pack light, breathable clothes and sun protection for summer, layers and a windproof jacket for spring and autumn, and a warm jacket for winter evenings. An umbrella is useful from November to March.
Yes, July and August are the busiest months, with large crowds and higher prices. For a quieter experience, visit in late spring or early autumn when the weather is still excellent but the village is more peaceful.
The warmest month, with the highest average maximum temperature, is August (25.8 °C). The month with the lowest average maximum temperature is January (14.7 °C). Overall, the average maximum temperature over the whole year is 19.9 °C.
The month with the highest average minimum temperature is August (25 °C). The coldest month, with the lowest average minimum temperature, is January (12.9 °C). Overall, the average minimum temperature over the whole year is 18.6 °C.
The month with the highest average water temperature is August (23.9 °C). The month with the lowest average water temperature is February (15 °C). Overall, the average water temperature over the whole year is 19 °C.
The wettest month, with the highest amount of precipitation, is February (38.1 mm). The driest month, with the least amount of precipitation, is July (2 mm). Over the whole year there are 220.9 mm of rainfall on average.
The month with the most days of rain is January (14.1 days). The month with the fewest days of rain is August (0.3 days). Over the whole year there are 87.4 days of rain on average.
The month with the highest average relative humidity is August (78.2 %). The month with the lowest average relative humidity is January (69.1 %). The overall average relative humidity over the whole year is 73 %.
The windiest month, with the highest average wind speed, is January (29.3 km/h). The calmest month, with the lowest average wind speed, is May (19.8 km/h). The overall average wind speed over the whole year is 23.9 km/h.
The month with the cloudiest skies, so the highest cloud coverage, is January (40.1 %). The month with the clearest skies, so the lowest cloud coverage, is July (2 %). Over the whole year there is an average cloud coverage of 20 %.
The month with the longest days, so the most daylight, is June (Average daylight: 14.1 h). The month with the shortest days, so the least daylight, is December (Average daylight: 9.1 h). Over the whole year there are 11.9 h of daylight per day on average.
The month with the most sunshine per day is August (Average sunshine: 12 h). The month with the least sunshine per day is January (Average sunshine: 5.2 h). Over the whole year there are 8.7 h of sunlight per day on average.
The months with the highest average UV index are July and August (UV index: 7). The month with the lowest average UV index is December (UV index: 3). Over the whole year the average UV index is 5.2.
