Greece Athens Weather in September — Climate Guide
September in Athens is very-high
September is very-high for Athens.
Best month for Athens — cooling + still warm + lower crowds than summer + Greek islands still open.
Travel score
Athens September Weather Stats
Avg High
28°C
Avg Low
18°C
Rainy Days
3
15mm total
Sunshine
10h
Daily avg
Humidity
55%
moderate
UV Index
7
High
Wind
9 km/h
Gusts 22
Sea Temp
24°C
swimming peak
Crowds
Very busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
18 μg/m³
PM10
32 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
28°C
Nighttime
18°C
Humidity and wind affect how the actual temperature feels.
Wind
9 km/h
Max gust 22 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- 28/18°C ideal
- Sea-temp 24°C
- Crowds dropping
- Greek islands ferry continues
Cons
- Hotels still elevated
- Korean Chuseok airfare spike
September Events & Festivals
- Athens Marathon training
- Korean Chuseok
Athens in September — Full Picture
Best month for Athens — cooling + still warm + lower crowds than summer + Greek islands still open.
What to Wear & What to Pack
Hot fall. Light cotton + light evening layer.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
20.3°C
11.3°C
5.3/mo
Summer (Jun·Jul·Aug)
32°C
21°C
1.3/mo
Autumn (Sep·Oct·Nov)
Current22.7°C
14°C
5.7/mo
Winter (Dec·Jan·Feb)
13.7°C
7.3°C
8/mo
Athens Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 13° | 7° | 8d·50mm | 5h | 70% | 2 | Quiet | Low season | |
| 14° | 7° | 7d·50mm | 6h | 68% | 2 | Quiet | Low season | |
| 16° | 8° | 7d·45mm | 7h | 65% | 4 | Quiet | Shoulder | |
| April (Best) | 20° | 11° | 5d·30mm | 9h | 60% | 5 | Busy | Peak |
| May (Best) | 25° | 15° | 4d·20mm | 10h | 55% | 7 | Very busy | Peak |
| 30° | 19° | 2d·10mm | 12h | 50% | 9 | Very busy | Peak | |
| 33° | 22° | 1d·5mm | 12h | 45% | 10 | Very busy | Peak | |
| 33° | 22° | 1d·5mm | 11h | 45% | 10 | Very busy | Peak | |
| September (Best) | 28° | 18° | 3d·15mm | 10h | 55% | 7 | Very busy | Peak |
| October (Best) | 23° | 14° | 6d·50mm | 8h | 65% | 5 | Busy | Shoulder |
| 17° | 10° | 8d·60mm | 5h | 70% | 3 | Moderate | Shoulder | |
| 14° | 8° | 9d·70mm | 4h | 75% | 2 | Moderate | Shoulder |
View Other Months
Athens September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Athens?
Athens in September is very-high. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Athens in September?
Athens September averages a high of 28°C and a low of 18°C.
Does it rain much in Athens in September?
Athens September averages 15mm of rainfall over about 3 rainy days.
What should I wear in Athens in September?
Hot fall. Light cotton + light evening layer.
What time are sunrise and sunset in Athens in September?
Athens September sunrise is 07:00 and sunset is 19:25, with 12h 25min of daylight.
What's the air quality like in Athens in September?
Athens September air quality (AQI) averages 50, rated Good. PM2.5 averages 18μg/m³.
What activities are recommended in Athens in September?
In September, Athens is great for Acropolis + Acropolis Museum, Greek islands (last warm month), Lycabettus sunset.
Is September peak season in Athens?
Athens September crowds are very busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Athens
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.