September in Sardinia is usually still warm enough for a beach holiday, especially during the first half of the month. The sea has stored summer heat, daytime temperatures are generally pleasant and many coastal services remain open.
That said, September is more variable than July or August. Short periods of rain, stronger wind or cooler evenings become increasingly possible as the month progresses.
Sea and daytime conditions
The sea normally remains comfortable for swimming because water temperatures fall more slowly than air temperatures. Sunny days can still feel fully summery, while evenings are often easier for walking and dining outside than during peak heat.
North-western and northern coasts can be exposed to mistral winds, while other sectors may be calmer. Checking the daily wind forecast is often more useful than looking only at temperature.
What to pack
Bring swimwear, sunscreen and light clothing, but add a light jacket or sweater for evenings. Comfortable shoes are worthwhile because September is an excellent month for combining beaches with historic towns, archaeological sites and hiking.
Travelers should think of September as late summer rather than guaranteed midsummer. With a flexible itinerary, it is one of the most enjoyable periods on the island.
