September in Santorini averages highs of 26 °C (78 °F) and lows of 21 °C (71 °F), with almost no rainy days and 12 h 21 min of daylight. The sea is warm, around 25 °C (78 °F).
September weather in Santorini at a glance
average high to low each dot ≈ 3 rainy days
Is September a good time to visit Santorini?
Great time to go: comfortably warm and fairly dry. September is usually high season in Santorini: book rooms early, as prices are typically at their highest.
Our rule: a month scores 2 points for comfortable average highs of 18–28 °C (1 point for 14–18 or 28–32 °C) and 2 points for 5 or fewer rainy days (1 point for 6–10). Average highs above 35 °C or below 8 °C make it a tough month whatever the rain. A rainy day here means 2 mm of rain or more. 4 points = great, 3 = good, 2 = mixed, 0–1 = tough.
Holidays and events in September 2026
No public holidays fall in September 2026 in Greece, so opening hours should be normal.
Things to do in Santorini in September
September's weather suits a mix of outdoor sights and museums, so the open-air ones come first.
- Oia sunset — arrive an hour early outdoors
- Fira to Oia caldera walk — about 10 km, best in cool months outdoors
- Red Beach and Perissa — black and red volcanic sand outdoors
- Caldera boat trip — volcano and hot springs outdoors
- Akrotiri — Bronze Age town under ash indoors
- Wineries — Assyrtiko tastings indoors
- Beach and swimming — the sea averages 25 °C (78 °F) in September. outdoors
Where to stay: Fira for transport and value; Oia or Imerovigli for caldera views; Kamari or Perissa for beaches.
What to pack for Santorini in September
- Light layers for the day.
- Swimwear.
- Comfortable walking shoes.
What a day in Santorini costs
| Budget traveller | Mid-range | |
|---|---|---|
| Typical total per person, per day | €60–170 | €250–680 |
Excluding flights. September is usually high season in Santorini: book rooms early, as prices are typically at their highest.
September in nearby cities
| City | High / low | Rainy days | Verdict |
|---|---|---|---|
| Athens | 29° / 19° | 2 | Good time to go |
| Istanbul | 26° / 18° | 6 | Good time to go |
| Cairo | 36° / 22° | 0 | Tough month |
Plan your Santorini trip
- Is Santorini Expensive? Real Costs and a 2026 Budget Guide
- How to Choose an AI Trip Planner in 2026 — 7 Things That Actually Matter
- Best Time to Visit Greece: Month-by-Month Guide 2026
Want the whole trip planned? Join the Journey waitlist: tell it where, when and your budget, and it plans every day hour by hour.
FAQ
Is September a good time to visit Santorini?
By the numbers, September is a great time to go: comfortably warm and fairly dry, with average highs of 26 °C (78 °F) and almost no rainy days. September is usually high season in Santorini: book rooms early, as prices are typically at their highest. The best months for weather are May, September, October.
How warm is Santorini in September?
Average highs are 26 °C (78 °F) and lows 21 °C (71 °F) (2015–2024 averages). The sea is warm, around 25 °C (78 °F).
Does it rain a lot in Santorini in September?
Expect about 0 days with 2 mm of rain or more, about 6 mm in total. It is the 3rd driest month of the year in Santorini.
Sources: climate averages from Open-Meteo historical weather (ERA5 reanalysis, 2015–2024); sea temperatures from the Open-Meteo marine API (2023–2024); public holidays from Nager.Date. Daylight is calculated for the 15th of the month. Averages are a guide, not a forecast. Costs are typical ranges per person per day, excluding flights.