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The Acropolis and Odeon of Herodes Atticus lit up at duskIstanbul at sunset over the Bosphorus, minaret and domes in silhouette

Athens vs Istanbul in September

Athens and Istanbul are close in September. Athens averages 20–30°C with high crowds; Istanbul 17–25°C with moderate crowds.

By Daan · Last reviewed October 2026

Athens and Istanbul

The verdict for September

  • WeatherVery similar9/10 vs 9/10
  • CrowdsIstanbul is quieterHigh vs Moderate
  • PricesIstanbul is cheaper€€€€ vs €€€
  • OverallVery similar9/10 vs 9/10
The Acropolis and Odeon of Herodes Atticus lit up at dusk

Athens in September

The heat begins to ease while summer energy remains, making September excellent for rooftops, beaches and sightseeing.

Temperature
20–30°C
Crowds
High
Prices
€€€€

+The heat begins to ease while summer energy remains, making September excellent for rooftops, beaches and sightseeing.

–The first half of September can still feel very busy and accommodation demand remains strong.

The heat begins to ease while summer energy remains, making September excellent for rooftops, beaches and sightseeing. The first half of September can still feel very busy and accommodation demand remains strong.

Athens in September
Istanbul at sunset over the Bosphorus, minaret and domes in silhouette

Istanbul in September

The best month to come

Temperature
17–25°C
Crowds
Moderate
Prices
€€€

+Warm and dry, perfect for rooftop nights, with crowds thinning after August.

–Still not a budget month — rates ease but don't collapse.

Warm enough for rooftop evenings without the summer crush.

Istanbul in September

Scores and crowd levels are my own judgement; temperatures are monthly averages. Higher scores are better: quieter, cheaper and more pleasant.

Another month