Hot in Sep
29°C average high
avg high · 20° at night
25°C+ on almost every day
Greece
Santorini weather in September
Is it warm? Yes. September in Santorini is warm: afternoons average 28°C and nights 22°C. Most days (80%) peak between 26°C and 29°C.
Warm · average high
28°C
25°C or more on almost every day.
- Average low22°overnight
- Sea25°average, 2022–2025
- Rainy days14 mm in the month
- SkyMostly clear10% cloud · 89% clear days
How warm it really gets
Every September afternoon from 2011–2025: 450 days. Most (80%) peaked between 26° and 29°.
September, year by year
The average September high in each year. The warmest, 2024, averaged 29°C; the coolest, 2019, 27°C.
Compared with home
Average September highs. Rain is rare: less than one wet day in a typical month.
- Santorini28°
- London21°
- Manchester18°
- Dublin18°
- Cork18°
- Belfast17°
- Glasgow17°
Warmer in September, not much further
Flying times are estimates from Dublin; Santorini is about 4h 15m.
Hot in Sep
32°C average high
avg high · 19° at night
25°C+ on almost every day
Hot in Sep
29°C average high
avg high · 20° at night
25°C+ on almost every day
Air: Copernicus ERA5-Land, 2011–2025, matched to the official averages for Santorini 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