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Santorini in September

Santorini Weather in September

🇬🇷 Greece

25°C
High
22°C
Low
1
Rain Days
11h
Sunshine
65%
Humidity

Europe › 🇬🇷 Greece › Santorini

Updated: March 2026

Is September a Good Time to Visit Santorini?

8/10
Excellent

September is a excellent time to visit Santorini (8/10). With 11 daily sunshine hours and only 1 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 6th sunniest of the year in Santorini. Beach and outdoor-focused visitors will find September ideal, though hotel prices reflect demand and popular sites get crowded by mid-morning. October offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Santorini's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: book accommodation at least 6-8 weeks ahead, as popular hotels fill quickly during September. Purchasing skip-the-line tickets for major attractions in advance saves meaningful time. If you have flexibility, arriving a few days before or after peak weekends reduces both crowds and prices noticeably.

vs August:27°C avg high

The single most important thing to know about visiting Santorini in September: conditions are genuinely cooperative, with 25°C highs and only 1 wet days making this one of the more straightforward months to plan around. Precipitation totals 5mm for the month, spread across roughly 1 days, and 11 sunshine hours per day give you a reliable window for outdoor plans.

25°C

Avg High

22°C

Avg Low

1 days

Rain Days

11h

Sunshine

65%

Humidity

Temperature in Santorini in September

The narrow 3°C gap between daytime and overnight temperatures, characteristic of coastal cities with maritime moderation, means a single mid-layer works across the whole day. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. UV index averages 6 this month, classed as moderate. Sunscreen is a sensible precaution for extended outdoor time, particularly at midday. Average wind speeds of 30 km/h add a meaningful windchill factor, making the 25°C temperature feel cooler than it reads. In Fahrenheit: 77°F average high, 72°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in September

Monthly Precipitation (mm)

What to Wear in Santorini in September

Morning22°CBefore the day warms up
Afternoon25°CPeak daytime temperature
Evening25°CAfter sunset cools down

Packing for Santorini in September means dressing for 25°C days and 22°C evenings. A light cotton tee with a casual overshirt works well at 25°C, the overshirt doubles as a layer for air-conditioned venues. Evening temperatures settle at 22°C, a modest 3°C drop that a light cardigan or denim jacket covers. European cobblestones reward low-profile walking shoes over flip-flops or heels, with cushioned trainers or leather walking shoes being the practical choice.

💡

Local tip: Many of Santorini's museums and galleries maintain cool interior temperatures regardless of outdoor conditions. A compact layer in your daypack lets you move between warm streets and chilled exhibition halls without discomfort.

Events in Santorini in September

September has no major festivals or public holidays in Santorini, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.

What to Pack for Santorini in September

Based on 25°C average highs and 1 rainy days

  • Light layers for morning and evening
  • Breathable T-shirts and comfortable trousers
  • UV-protective sunglasses
  • SPF 30+ sunscreen
  • Comfortable walking shoes (a second pair lets the first air out overnight)
  • Universal travel adapter
  • Small day pack for city exploration
  • Reusable water bottle

Best Activities in Santorini in September

  • Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 25°C, the temperature is ideal for extended walking without overheating
  • Guided walking tour of the historic centreMorning or late afternoonComfortable temperatures allow several hours on foot without fatigue
  • Visit rooftop viewpoints and observation decksGolden hour (1 hour before sunset)Warm clear evenings provide exceptional visibility for panoramic photography
  • Day trip to the surrounding countryside or coastFull day (depart by 8am)September is reliably dry enough for rural day trips without weather risk
  • Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
  • Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
  • Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
  • Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningSeptember brings distinct seasonal changes to public green spaces worth exploring
  • Try the seasonal farmer's market for local produce and street foodSaturday morning markets typically 8am-1pmSeptember seasonal produce is at peak availability, offering dishes not found at other times of year

Why is Santorini warm in September?

Santorini's September weather is dominated by the Azores High, a semi-permanent subtropical anticyclone that blocks Atlantic rain systems from reaching the Mediterranean. As a result, September delivers reliably sunny, dry conditions with temperatures averaging 25°C. The sea moderates extreme heat and keeps overnight lows around 22°C, making the city noticeably more comfortable than inland Mediterranean destinations. Climate data: Open-Meteo ERA5 (1991–2020).

Sunshine Hours

The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.

UV Index

A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate -- wear sunscreen. UV 6-7: High -- hat and SPF 30+ essential. UV 8-10: Very High -- limit midday exposure. UV 11+: Extreme -- seek shade between 10am-4pm.

Rain Days

A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.

Humidity

Relative humidity as a percentage. Below 40%: Dry -- skin and throat may feel parched. 40-60%: Comfortable -- ideal for most people. 60-80%: Sticky -- light, breathable fabrics recommended. Above 80%: Muggy -- heat feels more intense; quick-dry clothing is essential.

Frequently Asked Questions: Santorini in September

In September, Santorini experiences average highs of 25°C (77°F) and lows of 22°C (72°F). Expect around 1 rainy days and 11 hours of sunshine per day, with humidity averaging 65%. The 3°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 6, so sun protection is advisable on clear days.
Santorini typically sees 1 rainy days in September, with total precipitation of around 5mm. This makes September one of the drier months of the year, and a reliable window for outdoor sightseeing and day trips. Rain showers tend to be brief when they do occur. For context, the driest month in Santorini typically sees 4-6 fewer rain days than September.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Santorini in September. Daytime temperatures of 25°C are pleasant, but the evening drop to 22°C means a jacket is essential if you plan to be out after dark. Rain is infrequent with only 1 wet days, so a light rain layer is optional. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
Yes, September is an excellent time to visit Santorini. With 11 daily sunshine hours and only 1 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 25°C during the day are comfortable for long walks and outdoor dining. This is peak travel season, so booking accommodation in advance and arriving at popular attractions early in the morning helps avoid the busiest periods.
The average high temperature in Santorini in September is 25°C (77°F), and the average low is 22°C (72°F). The mean daily temperature is approximately 24°C (74°F). The day-to-night range of 3°C is narrow, typical of coastal or maritime cities. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Santorini is generally June. June offers the most sunshine at 13 hours per day and only 1 rainy days. Average temperatures reach 24°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around June gives you the best chance of dry, bright weather.
September is shoulder or low season in Santorini, meaning fewer tourists and generally lower prices than peak months. With 11 sunshine hours and 1 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In September, Santorini suits a range of activities thanks to mild temperatures around 25°C. With few rainy days, outdoor activities are highly recommended. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 11 hours of sunshine, parks and waterfront walks are particularly enjoyable.

September ranks 6th sunniest of the year in Santorini, with an average 11 daily sunshine hours. The driest months are July, August, and June. August is the hottest month (27°C avg high); January is the coolest (13°C). From here, temperatures fall 3°C into October. Compared to last month (August: 27°C high, 0 rain days), September is cooler and wetter. September sits in the middle of the annual sunshine ranking for Santorini, offering a reasonable balance of good weather and manageable crowds.

Year-Round Climate

MonthHighLowRain DaysSunDetails
January13°C11°C108hView
February14°C11°C99hView
March15°C12°C710hView
April17°C14°C411hView
May21°C17°C212hView
June24°C21°C113hView
July26°C23°C013hView
August27°C24°C013hView
September25°C22°C111hView
October22°C18°C410hView
November18°C15°C68hView
December15°C12°C97hView

Other Months in Santorini

JanFebMarAprMayJunJulAugSepOctNovDec

Plan Your Trip to Santorini

Best Time to Visit SantoriniSantorini vs Athens in SeptemberSantorini vs Mykonos in September

Nearby Destinations with Similar Weather

These cities are within 500 km and experience broadly comparable weather conditions during the same calendar month, making them practical standalone alternatives or worthwhile additions to a longer regional itinerary.

Athens🇬🇷 Greece234 km away
28°C19°C low
Mykonos🇬🇷 Greece118 km away
24°C21°C low

Data Sources for Santorini

Santorini on WikipediaOpen-Meteo Climate APINOAA National CentersUK Met OfficeWMOGeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.