The year on the Sicilian coast
The main figures are Palermo's, on the north coast, sea temperature included. Where it helps the contrast, Catania's are added: the east coast is drier and considerably hotter in summer.
There is a rule almost everyone applies to the Mediterranean, and it works across most of it: avoid July and August, go in May or in September and October, and you get the same place with half the people and similar weather.
In Sicily, half of that rule is false. May works. September half works. October does not work, and November less still, because by then the island is already inside its wet season, which is long and starts earlier than it seems.
01 The Mediterranean autumn does not work here
The fact that sums it up fits in one sentence: in Palermo it rains more in October, with 77.2 millimetres, than in January, with 71.4. And it rains far more in November, with 94.3, than in any other month of the year, December included.
That breaks intuition in two ways at once. It puts the rainfall peak in autumn rather than mid-winter. And it turns October — the month that across half of Europe means a pleasant off-season — into one of the five wettest in the Sicilian calendar.
The Sicilian winter is not cold, and that is where the misunderstanding comes from. With average January highs of 15.1 degrees, the island has one of Europe's mildest winters. But mild does not mean dry, and here what defines the season is water, not the thermometer.
02 The numbers that prove it
Lined up, Palermo's millimetres draw the curve clearly: 71.4 in January, 64.9, 59.4, 44.2, 25.6, 12.2, 5.1, 13.4, 41.6, 77.2, 94.3 and 81.3 in December. A clean descent to July and an equally clean climb afterwards.
Wet days tell the same story and are more useful for planning: 9.3 in January, 3.7 in May, 0.7 in July, 7.8 in October, 9.4 in November and 10.1 in December. In December it rains one day in three; in July, one in forty.
The east coast is drier but follows the same pattern. Catania totals 483.8 millimetres a year over 50.7 days, peaking in December (78.5) and November (66.2), and bottoming out in July (7.8 millimetres over four tenths of a day).
03 The September switch
What makes the Sicilian autumn surprising is not only how much it rains, but how fast it changes. In Palermo, August leaves 13.4 millimetres over 1.8 days; September, 41.6 over 4.7; October, 77.2 over 7.8. Rain multiplies by six in two months.
In Catania the jump is sharper still: from 9.8 millimetres over 0.5 days in August to 50.5 over 4.6 days in September. A fivefold multiplier in water and ninefold in days, from one month to the next.
September still pays off, because the air falls to 27.9 degrees and the sea holds 25. It is the last month when both hold up. After that, the sea stays pleasant — 22 degrees in October, 18 in November — but the sky stops cooperating.
04 Summer and the European record
At the other extreme there is a different problem. July is the driest month of the year, with 5.1 millimetres over seven tenths of a day, and August is not far behind. On paper it is a perfect sky; the problem is the temperature.
In Palermo, on the ventilated north coast, average highs stop at 30.9 and 31.4 degrees. In Catania, sheltered by Etna, they climb to 35.1 and 35.5, and passing 40 degrees happens a couple of times in most years.
The ceiling is set by an official figure. On 11 August 2021, an automatic station in Syracuse recorded 48.8 degrees, and the World Meteorological Organization validated the reading as the temperature record for continental Europe. It beat the 48.0 degrees of Athens and Elefsina in July 1977.
05 The real window: April, May and June
With autumn ruled out for water and August for heat, the good window is tightly drawn: April, May and June. April gives 44.2 millimetres over 6.4 days and 19.8 degrees; May, 25.6 over 3.7 days and 24; June, 12.2 over 1.6 days and 28.1.
June also hides a detail almost nobody checks. In Catania, June adds up to 381.6 hours of sunshine, more than July (378.9) and August (369.9). It is the sunniest month of the year and, at the same time, three and a half degrees cooler than August.
The one concession spring requires is the sea. In April it is 17 degrees and in May 21, against July and August's 26. Anyone coming to swim will have to wait for June, at 24; anyone coming to walk and see the interior has in April and May the best moment of the year.
The year's four stretches
Rain falls from 44.2 to 25.6 and then 12.2 millimetres, and wet days from 6.4 to 1.6. Highs climb from 19.8 to 28.1 degrees and the sea from 17 to 24. In Catania, June adds up to 381.6 hours of sunshine, the year's maximum.
5.1 and 13.4 millimetres, and the sea at 26 degrees: the year's best swimming. The price is average highs of 35.1 and 35.5 in Catania, the 48.8 of the European record measured in Syracuse in August 2021, and the biggest crowds.
From 41.6 to 77.2 and then 94.3 millimetres, with wet days going from 4.7 to 9.4. November is the wettest month of the year. September still holds up, with air at 27.9 degrees and sea at 25; October and November do not.
Between 59.4 and 81.3 millimetres a month and up to 10.1 wet days in December. Highs never drop below 15.1 degrees, so it is not cold: it simply rains. February and March improve, and February brings the almond blossom.
06 And if you can only go in winter
The Sicilian winter has one real advantage worth taking seriously: it is mild. No month drops below average highs of 15.1 degrees and lows stay around 9. Compared with almost anywhere in Europe, that is a comfortable January.
Within that block, the month that comes out best is February: 64.9 millimetres over 8.8 days, slightly less than January, and the almond blossom, the first event in the island's farming calendar, which fills the southern fields with white.
And there is one thing that can only be done in winter. Above two thousand metres, Etna holds snow and its two ski areas operate. On the same island where 48.8 degrees were measured in August, you can ski in January. It is not the main reason to come, but it explains rather well what kind of place this is.
