Malta Weather in September 2026

September in Malta delivers the shoulder sweet spot: daytime highs of 27.6C (82F), overnight lows around 23.3C (74F), rainfall climbing to 32mm across 4.7 wet days, and sunshine still healthy at 11.2 hours per day. Sea temperatures peak around 26-27C, warmer than at any other point in the year, and the first mid-month cold fronts introduce dramatic thunderstorm evenings that clear quickly and drop nighttime humidity noticeably.

On the ground, September revolves around the Isla Regatta on Victory Day, September 8, when traditional rowing boats race across Grand Harbour in a fiercely contested inter-village rivalry that dates to Ottoman-siege commemorations. The Notte Bianca setup begins late-month with Valletta streets closing for the first October arts previews, cruise-ship intensity moderates back to bearable levels by the third week, and diving conditions remain excellent with warm water and increasing thermocline visibility.

The ten-year trend shows September warming faster than August at the coast, with roughly 1.4C added since 2016 and later onset of autumn rain patterns. The 2026 Copernicus outlook favours above-average warmth with near-normal precipitation, meaning Isla Regatta conditions should stay dry and warm, though at least one significant thunderstorm event in the final week is historically probable and modelling supports that pattern for 2026.

For 2026 travelers, September pairs peak sea temperatures with declining crowds and pricing that starts unwinding from July peaks by mid-month. Book Isla Regatta harbor-view accommodation by July, reserve diving trips with warm-water thermocline expertise, and expect one dramatic thunderstorm evening where the smart move in 2026 is a covered rooftop restaurant with a view.