There are two Costa Smeraldas. One lasts ten weeks, from mid-July to the end of August, and everyone knows it: it is the one in the photographs, with full marinas and tables booked weeks in advance. The other lasts much longer, starting at the end of March and ending in November, and almost nobody talks about it.
It is not a scaled-down version of the first. It is a different place, with a different light, and it asks to be approached with different expectations. This guide explains what you really find in Gallura outside the two central months, and above all what you don’t.
The coast’s real calendar
The season is not decided by the hotels: it is decided by the flights. Olbia airport works on the summer aviation season, which runs from the end of March to the end of October, and within that window concentrates dozens of airlines and almost ninety destinations. The long-haul routes — New York, Dubai — start later, around May, and stop in October.
The historic hotels follow in stages. The first open at the end of March, the others throughout April. No property publishes a precise autumn closing date: they say “until October”, and in October the coast switches off piece by piece, not all at once. It is a detail that matters: if you are planning a stay at the end of October, the right question is not “are you open?” but “what remains open around you?”.
The most telling figure on crowding always comes from the airport: on the peak days of August, Olbia handles more passengers in forty-eight hours than in the whole of February, with peaks approaching thirty thousand people in a single day. It is the most honest snapshot of the difference between the two seasons.
May: the most beautiful coast, the coldest sea
May is the month when Gallura is visually at its best. The Mediterranean scrub is still green and in full bloom, rockrose covers the hills in white and pink, the helichrysum has not yet dried out. Daytime air temperatures sit comfortably above twenty degrees in the middle of the day, and the evenings still call for a jumper.
The sea, however, is another matter. In May the water is still cold: the gap between air and water temperature is the least favourable of the whole season. You can swim, of course, but it is a short, bracing dip, not the long soak of August. Those who come in May should come for the walks, the empty coves, the long evening light — not to stay in the water.
In return, you find everything: parking, tables, deserted paths. The beaches that fill up by half past nine in the morning in August remain accessible all day in May.
The reversal almost nobody knows: June versus September
If we had to give one single useful fact to anyone choosing when to come, it would be this. In June the air is warmer than in September. The sea, however, is warmer in September than in June — and by quite a lot.
The reason is simple physics: water has enormous thermal inertia. In June the Mediterranean is still warming up after winter and lags behind; in September it has stored the whole summer and releases it slowly. September is, in effect, the month when the sea in Gallura is at its warmest all year.
This turns common intuition on its head. Those looking for long days, terraces until late and warm evenings will choose June. Those looking for the water — long swims, snorkelling, boat days with people who don’t want to climb back on board — should choose September. They are two different holidays, and confusing them is the most common way to be disappointed.
An honest caveat: monthly average sea temperatures vary by a couple of degrees from year to year, so any precise figure you read online should be taken as an indication, not a promise.
October: the best light of the year
October is the month that divides opinion. The first two weeks are often a continuation of September with fewer people; the last two can bring the first serious autumn rain — statistically, October is the wettest of the season’s months, and by some margin.
Those who accept this uncertainty are rewarded with the best light of the year. The low sun sets the granite aglow and turns it truly pink, something that never happens at noon in August. The sea stays warm enough for a swim. And the relationship between what you pay and what you get changes radically.
It is also when the hinterland becomes more interesting than the coast: the archaeological sites of Arzachena, Gallura’s wineries in the middle of the late harvest, villages that go back to being villages. October Sardinia is less a beach destination and more a place where you simply live.
The wind doesn’t take a holiday
There is a widespread belief that the mistral is a winter phenomenon and leaves the coast in peace in summer. In the archipelago and along the Costa Smeralda, this belief is simply false.
Historical data from the regional weather and climate agency show that winds from the west to north-west dominate the area’s maximum daily winds on more than half the days of the year, and that in the La Maddalena area — the station closest to this stretch of coast — there are no substantial differences between months. This is a local exception compared with the rest of the island, where strong wind is clearly more of a winter feature. Not here: the mistral has no real off season.
What changes in summer is the average intensity, not the frequency: in the warm months moderate winds become more common, the kind that makes a boat day lively rather than impossible. Days of flat calm are, statistically, very rare in Sardinia in any season.
The practical consequence is always the same, in May as in August: check the forecast the evening before and choose your side of the coast accordingly. With the mistral, head for the bays sheltered to the south-east; with the sirocco, the exact opposite.
The two extremes: April and November
At the edges of the season there are two months that deserve separate mention, because they are not for everyone.
April is the month of reopening. The flights are back, the first hotels raise their shutters, but the coast is still getting ready: you see maintenance work under way, the beaches have no facilities, many restaurants open only at weekends. On the other hand, the Gallura countryside in April is greener than it will be for the rest of the year, and the days are already long. It is the right month for those who come to walk, visit archaeological sites and tour wineries — not for those who come to swim.
November is the month when the coast stops being a destination and goes back to being a place. The flight season is over, connections are reduced and most properties have closed. What remains are the communities who live here all year round, and a sea that at the start of the month still holds some of its stored warmth. Those who own a home here know it well; those coming on holiday usually don’t. We don’t recommend it for a first visit.
The plan B you need
Outside the central months, one day in a few may be windy or rainy, and the difference between a good stay and a frustrating one lies entirely in having something to do other than the beach. Fortunately, Gallura has plenty.
There is archaeology: the Arzachena sites are open all year, can be visited in half a day and look even better in grey light, because the granite loses its glare. There is wine: Gallura’s wineries welcome visitors by appointment even out of season, and in autumn you see them at the most interesting moment of their year. There are the inland villages, Aggius, Luogosanto and Tempio Pausania, which hardly anyone reaches in summer because everyone stays on the coast.
And there is one thing that is simply impossible in August: eating well without booking. Out of season, the restaurants that stay open have time, the chefs come out of the kitchen, and the same dinner that on the August bank holiday is a tight sitting becomes an evening.
What changes in the organisation
Outside the central months the practical rules of a stay also change, and this is where much of the advantage lies.
Villas are rented differently. In high season the established market practice is a seven-night stay with Saturday arrival and departure — not a legal requirement but a commercial custom, and a very rigid one. Out of season, shorter stays and flexible arrival days open up, which completely changes the planning for anyone with less than a week.
Services must be requested, not taken for granted. A restaurant open seven days a week in July may do three evenings in May. The same goes for rentals, dive centres and transfers. It isn’t a problem: it is just something to check beforehand, not afterwards.
The tourist tax follows a surprising logic. In Arzachena — the municipality that includes Porto Cervo, Cala di Volpe, Romazzino, Baja Sardinia and Cannigione — accommodation providers charge the daily rate only in the central summer months. However, those who book through affiliated platforms pay a percentage of the cost of the stay at any time of year. In other words: out of season, booking directly with the property and booking through a platform are not the same thing, even from a tax point of view. Rates are updated by municipal resolution, so it is always worth having them confirmed.
One point that causes confusion more often than you would think: Arzachena and Olbia are two separate municipalities, with two separate sets of rules and two separate tariffs. Porto Cervo is not Olbia.
How we would choose
For first-timers who want the full package — warm sea, all services running, long evenings — the best window is the first half of September. You get the sea at its warmest, the coast still fully operational and far fewer visitors than in August.
For those seeking landscape and solitude more than swimming, May has no rivals: the scrub in bloom, empty paths, the small coves truly small again, for the few.
For returning visitors who already know the places and want to see them in a different light, October is the island’s most underrated month — provided you accept that one day in a few may be rainy, and have a plan B that isn’t the beach.
One last thing about the figures you read online
Planning an off-season trip almost always means spending a few hours comparing temperature tables, historical averages and wind statistics. It is worth knowing how reliable they are.
Air temperatures are the most solid data: they are thirty-year averages measured by official stations and change little. Sea temperatures should be taken with more caution, because sources differ by up to a degree and monthly averages vary by a couple of degrees from year to year. The pattern holds — September warmer than June, May the coldest month of the season — but individual figures do not.
On wind, the most honest fact is that no reliable monthly statistics are published for this stretch of coast: specialist websites openly state that they don’t have enough data for Porto Cervo. What can be said comes from regional historical series and is a trend, not a forecast. The real forecast is the one you check the evening before.
July and August remain wonderful, and nobody denies it. But they are the only two months when this coast has to be shared with everyone else. In the other five, for long stretches, you practically have it to yourself.