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Sardinia, Italy

Olbia & Costa Smeralda weather in September

Is it warm? Yes. September in Olbia & Costa Smeralda is hot: afternoons average 29°C and nights 17°C. Most days (80%) peak between 25°C and 32°C.

Hot · average high

29°C

25°C or more on about nine in ten days; 20°C or more on almost every day.

  • Average low17°overnight
  • Sea24°average, 2022–2025
  • Rainy days443 mm in the month
  • SkySome cloud39% cloud · 47% clear days

How warm it really gets

Every September afternoon from 2011–2025: 450 days. Most (80%) peaked between 25° and 32°.

Number of September days by daily high, 2011–2025.

September, year by year

The average September high in each year. The warmest, 2023, averaged 30°C; the coolest, 2024, 27°C.

Average September high by year: 2011: 29.2°C, 2012: 27.6°C, 2013: 28.3°C, 2014: 29.4°C, 2015: 28.6°C, 2016: 28.3°C, 2017: 27.4°C, 2018: 28.5°C, 2019: 29.5°C, 2020: 28.2°C, 2021: 29.3°C, 2022: 29.7°C, 2023: 30°C, 2024: 27.3°C, 2025: 29.2°C.

Compared with home

Average September highs. Expect rain on about 4 days (43 mm in a typical month).

  • Olbia & Costa Smeralda29°
  • London21°
  • Manchester18°
  • Dublin18°
  • Cork18°
  • Belfast17°
  • Glasgow17°

Other months

Olbia & Costa Smeralda all year · Where else is hot in September

Warmer in September, not much further

Flying times are estimates from Dublin; Olbia & Costa Smeralda is about 2h 45m.

  • Hot in Sep

    32°C average high

    avg high · 19° at night

    25°C+ on almost every day

    Seville

    Spain

    Sea
    Inland
    Rain
    3 days
    Sky
    Some cloud
    From Dublin
    ≈ 2h 45m

  • Hot in Sep

    30°C average high

    avg high · 22° at night

    25°C+ on almost every day

    Hammamet

    Tunisia

    Sea
    27°
    Rain
    4 days
    Sky
    Some cloud
    From Dublin
    ≈ 3h 15m

  • Very hot in Sep

    33°C average high

    avg high · 19° at night

    25°C+ on almost every day · often 35°C+

    Marrakech

    Morocco

    Sea
    Inland
    Rain
    1 day
    Sky
    Some cloud
    From Dublin
    ≈ 3h 30m

Air: Copernicus ERA5-Land, 2011–2025, matched to the official averages for Olbia airport. Sea: Copernicus ERA5, 2022–2025. Rainy days = days with 1 mm of rain or more, as weather stations count them. Clear day = average cloud cover of 30% or less. These are averages of past weather, not a forecast. Methodology