Greece Santorini Weather in September — Climate Guide
September in Santorini is very-high
September is very-high for Santorini.
Best month — post-cruise crowds drop sharply + still warm + sea-temp still 24°C + hotels easing.
Travel score
Santorini September Weather Stats
Avg High
25°C
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
Air Quality
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
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
Seasonal Weather Overview
Spring (Mar·Apr·May)
18.7°C
12.7°C
5.7/mo
Summer (Jun·Jul·Aug)
28.3°C
21.3°C
0.3/mo
Autumn (Sep·Oct·Nov)
Current21.7°C
16°C
5/mo
Winter (Dec·Jan·Feb)
14.3°C
9.7°C
10.7/mo
Santorini Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 14° | 9° | 11d·75mm | 4h | 73% | 1 | Quiet | Low season | |
| 14° | 9° | 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 | |
| September (Best) | 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
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.