Santorini records about 370mm of rain across roughly 50 wet days a year, which is a 14% chance on an average day. December is the wettest month at 80mm (22% of the annual total) and July the driest at 0mm. Local rain type: brief showers. Santorini is one of the driest Greek islands. From May to September, rain is virtually nonexistent — leave the umbrella at the hotel. Winter storms are brief but can be dramatic.
Chance of rain on an average day: 14%
Rainfall climatology for Santorini. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 370mm |
| Rain days per year | 50 |
| Odds on an average day | 14% |
| Wettest month | December — 80mm over 11 days |
| Driest month | July — 0mm over 0 days |
| Rain type | brief showers |
| Best dry window | June through September is bone-dry with less than 5mm total rainfall across four months. |
| Worst rain window | December and January bring the heaviest rain, though showers rarely last more than a few hours. |
December delivers 8000% more rain than July (80mm vs 0mm). That gap is the difference between planning around showers and ignoring them.
22% of the year's rain falls in December alone, so Santorini has a genuine wet season rather than evenly spread showers.
Santorini rain typically comes as discrete showers, so a compact umbrella and a flexible plan are usually enough.
Rain falls on about 11 days in December against 0 in July — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 70mm | 9 | 30% | 14°C |
| February | 50mm | 7 | 23% | 14°C |
| March | 40mm | 5 | 17% | 16°C |
| April | 20mm | 3 | 10% | 20°C |
| May | 10mm | 1 | 3% | 23°C |
| June | 2mm | 1 | 3% | 27°C |
| July | 0mm | 0 | 0% | 29°C |
| August | 0mm | 0 | 0% | 29°C |
| September | 10mm | 1 | 3% | 27°C |
| October | 30mm | 4 | 13% | 23°C |
| November | 60mm | 8 | 27% | 20°C |
| December | 80mm | 11 | 37% | 16°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Santorini we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Santorini records rain on roughly 50 days a year — about a 14% chance on any given day — totalling around 370mm.
December, with about 80mm over 11 rain days. That is 22% of the entire year's rainfall in a single month.
July is the driest month at 0mm across roughly 0 days. June through September is bone-dry with less than 5mm total rainfall across four months.
Santorini is one of the driest Greek islands. From May to September, rain is virtually nonexistent — leave the umbrella at the hotel. Winter storms are brief but can be dramatic.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.