Santorini Weather in May

🇬🇷 Greece

21°C

High

17°C

Low

Rain Days

12h

Sunshine

65%

Humidity

Europe › 🇬🇷 Greece › Santorini

Updated: March 2026

Is May a Good Time to Visit Santorini?

8/10

Excellent

May is a excellent time to visit Santorini (8/10). With 12 daily sunshine hours and only 2 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 4th sunniest of the year in Santorini. Beach and outdoor-focused visitors will find May ideal, though hotel prices reflect demand and popular sites get crowded by mid-morning. April 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 May. 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 April:17°C avg high

The single most important thing to know about visiting Santorini in May: conditions are genuinely cooperative, with 21°C highs and only 2 wet days making this one of the more straightforward months to plan around. Precipitation totals 10mm for the month, spread across roughly 2 days, and 12 sunshine hours per day give you a reliable window for outdoor plans.

21°C

Avg High

17°C

Avg Low

2 days

Rain Days

12h

Sunshine

65%

Humidity

Temperature in Santorini in May

The narrow 4°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 9 this month, classed as high to very high. SPF 30+ sunscreen, a brim hat, and sunglasses are not optional between 10am and 4pm. Average wind speeds of 28 km/h add a meaningful windchill factor, making the 21°C temperature feel cooler than it reads. In Fahrenheit: 70°F average high, 63°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in May

Monthly Precipitation (mm)

What to Wear in Santorini in May

Morning17°CBefore the day warms up

Afternoon21°CPeak daytime temperature

Evening20°CAfter sunset cools down

Packing for Santorini in May means dressing for 21°C days and 17°C evenings. A light cotton tee with a casual overshirt works well at 21°C, the overshirt doubles as a layer for air-conditioned venues. Evening temperatures settle at 17°C, a modest 4°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.

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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 May

May 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 May

Based on 21°C average highs and 2 rainy days

Light jacket or cardigan for cooler evenings
Mix of short and long-sleeve layers
Comfortable walking shoes with good arch support
Universal travel adapter
Small day pack for city exploration
Reusable water bottle

Best Activities in Santorini in May

Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 21°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)May 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 morningMay 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-1pmMay seasonal produce is at peak availability, offering dishes not found at other times of year

Why is Santorini mild in May?

Santorini's May weather is dominated by the Azores High, a semi-permanent subtropical anticyclone that blocks Atlantic rain systems from reaching the Mediterranean. As a result, May delivers reliably sunny, dry conditions with temperatures averaging 21°C. The sea moderates extreme heat and keeps overnight lows around 17°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 May

In May, Santorini experiences average highs of 21°C (70°F) and lows of 17°C (63°F). Expect around 2 rainy days and 12 hours of sunshine per day, with humidity averaging 65%. The 4°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 9, so sun protection is advisable on clear days.

Santorini typically sees 2 rainy days in May, with total precipitation of around 10mm. This makes May 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 May.

Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Santorini in May. Daytime temperatures of 21°C are pleasant, but the evening drop to 17°C means a jacket is essential if you plan to be out after dark. Rain is infrequent with only 2 wet days, so a light rain layer is optional. Comfortable walking shoes are a priority given the amount of ground most visitors cover.

Yes, May is an excellent time to visit Santorini. With 12 daily sunshine hours and only 2 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 21°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 May is 21°C (70°F), and the average low is 17°C (63°F). The mean daily temperature is approximately 19°C (66°F). The day-to-night range of 4°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.

May is shoulder or low season in Santorini, meaning fewer tourists and generally lower prices than peak months. With 12 sunshine hours and 2 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 May, Santorini suits a range of activities thanks to mild temperatures around 21°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 12 hours of sunshine, parks and waterfront walks are particularly enjoyable.

May ranks 4th sunniest of the year in Santorini, with an average 12 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 rise 3°C into June. Compared to last month (April: 17°C high, 4 rain days), May is warmer and drier. May sits in the middle of the annual sunshine ranking for Santorini, offering a reasonable balance of good weather and manageable crowds.

Year-Round Climate

Month	High	Low	Rain Days	Sun	Details
January	13°C	11°C	10	8h	View
February	14°C	11°C	9	9h	View
March	15°C	12°C	7	10h	View
April	17°C	14°C	4	11h	View
May	21°C	17°C	2	12h	View
June	24°C	21°C	1	13h	View
July	26°C	23°C	0	13h	View
August	27°C	24°C	0	13h	View
September	25°C	22°C	1	11h	View
October	22°C	18°C	4	10h	View
November	18°C	15°C	6	8h	View
December	15°C	12°C	9	7h	View

Other Months in Santorini

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Plan Your Trip to Santorini

Best Time to Visit Santorini Santorini vs Athens in May Santorini vs Mykonos in May

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

25°C15°C low

Mykonos🇬🇷 Greece118 km away

20°C17°C low

Data Sources for Santorini

Santorini on Wikipedia Open-Meteo Climate API NOAA National Centers UK Met Office WMO GeoNames

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