When to sail South Sardinia: a week-by-week guide

The short answer: 19 June to 2 July. Southern Sardinia is shielded from the mistral by the bulk of the island — a hard day starts there at 20 knots, against 25.1 in the Strait of Bonifacio 200 miles north. But mid-May is as bad here as in the Balearics.

Private sailing in South Sardinia — the Villasimius coast — We build the week with you, once the window is chosen.

At a glance

Best week 19 June – 25 June — ×0.4 (2.2 % hard days, 4/26).
Week to avoid 15 May – 21 May — ×2.5 (13.2 %, 12/26).
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Week	Wind risk	Hard days	Summers affected	Sea	Daylight
15 May – 21 May	×2.5	13.2 %	12/26	18.7 °C	14.4 h
22 May – 28 May	×0.7	3.8 %	5/26	19.6 °C	14.5 h
29 May – 4 June	×0.8	4.4 %	7/26	20.6 °C	14.7 h
5 June – 11 June	×1.2	6.0 %	7/26	21.9 °C	14.8 h
12 June – 18 June	×0.7	3.8 %	4/26	22.8 °C	14.9 h
19 June – 25 June	×0.4	2.2 %	4/26	23.7 °C	14.9 h
26 June – 2 July	×0.7	3.8 %	5/26	24.5 °C	14.9 h
3 July – 9 July	×1.3	6.6 %	7/26	24.8 °C	14.8 h
10 July – 16 July	×0.9	4.9 %	5/26	26.0 °C	14.7 h
17 July – 23 July	×0.9	4.9 %	6/26	26.7 °C	14.5 h
24 July – 30 July	×1.2	6.0 %	7/26	26.0 °C	14.4 h
31 July – 6 Aug	×1.2	6.0 %	6/26	26.1 °C	14.2 h
7 Aug – 13 Aug	×0.4	2.2 %	3/26	26.4 °C	13.9 h
14 Aug – 20 Aug	×0.8	4.4 %	5/26	27.4 °C	13.7 h
21 Aug – 27 Aug	×0.5	2.7 %	3/26	27.1 °C	13.4 h
28 Aug – 3 Sept	×1.3	6.6 %	8/26	26.1 °C	13.1 h
4 Sept – 10 Sept	×1.1	5.5 %	6/26	26.0 °C	12.8 h
11 Sept – 17 Sept	×1.3	6.9 %	6/26	25.4 °C	12.5 h

Risk index: ×1.0 = the area’s own summer average. “Summers affected” counts, out of 26, how many summers actually saw a hard day in that slot — below 4, it is an accident, not a regime. Sea in °C (2023-2025 average), daylight in hours.

The island’s shadow

The mistral that sweeps the Strait of Bonifacio reaches the south much weakened: the whole Sardinian relief stands in the way. The result is a hard-day threshold of 20 knots and a season that is gentler overall than on the island’s east coast.

The trap is the same as everywhere in the western basin: the week of 15 to 21 May is the worst of the summer, at two and a half times the norm. Five of our ten Mediterranean areas put their risk peak on that same week — the Mediterranean switches to its summer regime later than people assume.

How these figures are produced

Hourly ERA5 reanalysis over 26 summers (2000-2025) at an open-sea point, calibrated against stations that actually measure — the AEMET, Météo-France and NOAA networks. The “hard day” threshold is the local 95^th percentile, never a shared value: 20.0 knots here. The comparison is made on ranks, not on knots, because the gap between measured and modelled gusts ranges from half a knot to thirty-one depending on the coast.

One caveat, because it matters: this index measures frequency, not severity. A week rated very calm can still hold the worst day of the decade.

Frequently asked questions

Is South Sardinia windy?

Less than the north of the island. The hard-day threshold is 20 knots there against 25.1 in the Strait of Bonifacio. The trade-off is slightly more calm at the height of summer.

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