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Santorini Weather in September — Climate Guide

September in Santorini is very-high

Avg High
25°C
Avg Low
19°C
Rainy Days
2
Sunshine
10h

September is very-high for Santorini.

Best month — post-cruise crowds drop sharply + still warm + sea-temp still 24°C + hotels easing.

Crowds: Very busy Prices: Peak Sea temp: 24°C
10 /10

Travel score

Santorini September Weather Stats

Avg High

25°C

-10°
40°
Temperature range

Avg Low

19°C

Rainy Days

2

15mm total

Sunshine

10h

Daily avg

Humidity

60%

moderate

UV Index

7

High

Wind

13 km/h

Gusts 38

Sea Temp

24°C

swimming peak

Crowds

Very busy

At attractions

September Sunrise & Sunset

Sunrise
06:55
Day length
12h 35min
Sunset
19:30
00:0006:0012:0018:0024:00

Air Quality

40
AQI
Good
GoodModeratePoorVery poor

PM2.5

13 μg/m³

PM10

22 μg/m³

Status

good

Feels-Like Temperature & Wind

Feels like

Daytime

25°C

/

Nighttime

18°C

Humidity and wind affect how the actual temperature feels.

Wind

13 km/h

Max gust 38 km/h

Activities Recommended for September

Oia sunset Caldera cruise (last 2 weeks) Wineries (harvest) Beach days

September Travel Pros & Cons

Pros

  • 25/19°C ideal
  • Sea-temp 24°C
  • Crowds dropping mid-month
  • Korean Chuseok usable

Cons

  • First half still crowded
  • Korean Chuseok premium

September Events & Festivals

  • Post-cruise season starts mid-month
  • Korean Chuseok

Santorini in September — Full Picture

Best month — post-cruise crowds drop sharply + still warm + sea-temp still 24°C + hotels easing.

What to Wear & What to Pack

Late summer. Light cotton + light evening layer.

Packing Checklist

Light cotton
Light cardigan (evening)
Sneakers + sandals
Sunglasses
SPF 30

Seasonal Weather Overview

Spring (Mar·Apr·May)

Avg High

18.7°C

Avg Low

12.7°C

Rainy days

5.7/mo

Busy Peak

Summer (Jun·Jul·Aug)

Avg High

28.3°C

Avg Low

21.3°C

Rainy days

0.3/mo

Very busy Peak

Autumn (Sep·Oct·Nov)

Current
Avg High

21.7°C

Avg Low

16°C

Rainy days

5/mo

Busy Shoulder

Winter (Dec·Jan·Feb)

Avg High

14.3°C

Avg Low

9.7°C

Rainy days

10.7/mo

Quiet Low season

Santorini Monthly Weather Comparison

Month High Low Rain Sun Humid UV Crowd Price
14° 11d·75mm 4h 73% 1 Quiet Low season
14° 10d·65mm 5h 71% 2 Quiet Low season
15° 10° 8d·55mm 6h 70% 3 Quiet Shoulder
April (Best)
18° 12° 6d·30mm 8h 65% 5 Busy Peak
May (Best)
23° 16° 3d·15mm 10h 60% 7 Very busy Peak
June (Best)
27° 20° 1d·5mm 12h 55% 9 Very busy Peak
29° 22° 0d·0mm 13h 50% 10 Very busy Peak
29° 22° 0d·0mm 12h 52% 9 Very busy Peak
25° 19° 2d·15mm 10h 60% 7 Very busy Peak
October (Best)
22° 16° 5d·50mm 7h 65% 4 Busy Shoulder
18° 13° 8d·65mm 5h 70% 3 Quiet Shoulder
15° 11° 11d·75mm 4h 73% 2 Quiet Low season

View Other Months

Santorini September Hotel Picks

Frequently Asked Questions

Is September a good time to visit Santorini?

Santorini in September is very-high. Tourist crowds are very busy and flight/hotel prices are peak.

What's the average temperature in Santorini in September?

Santorini September averages a high of 25°C and a low of 19°C.

Does it rain much in Santorini in September?

Santorini September averages 15mm of rainfall over about 2 rainy days.

What should I wear in Santorini in September?

Late summer. Light cotton + light evening layer.

What time are sunrise and sunset in Santorini in September?

Santorini September sunrise is 06:55 and sunset is 19:30, with 12h 35min of daylight.

What's the air quality like in Santorini in September?

Santorini September air quality (AQI) averages 40, rated Good. PM2.5 averages 13μg/m³.

What activities are recommended in Santorini in September?

In September, Santorini is great for Oia sunset, Caldera cruise (last 2 weeks), Wineries (harvest).

Is September peak season in Santorini?

Santorini September crowds are very busy and prices are peak. Advance reservations are strongly recommended.

Best Months to Visit Santorini

View Other Months

Why you can trust weather guide

Jimmy Kong TripPick founder · Travel content creator

Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.

8+ years analyzing travel data 30+ countries visited Live exchange rate verified
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