Athens weather in September
Athens averages 29°C by day and 19°C at night in September, with the sea at 26°C and 3 days with at least 1 mm of rain. It cools by about 5°C into October.
Day
29°C
Night
19°C
Sea
26°C
Rainy days
3
Flight from London
3½h
What September feels like
September is hot in Athens: proper beach weather.
The sea is warm at 26°C: comfortable for long swims.
Rain is occasional, on about 3 days.
Of the 48 sun destinations we track, Athens is the #24 warmest in September, and #10 of 23 within 5½ hours of the UK.
Want it warmer in September?
These are hotter than Athens this month for at most an hour and a half more flying:
Athens weather by month
September is highlighted. Compare with August and October, or see the full year in Athens.
Athens in September: quick answers
Is Athens hot in September?
September is hot in Athens: proper beach weather. Average highs are 29°C and lows 19°C.
Can you swim in Athens in September?
The sea is warm at 26°C: comfortable for long swims.
Does it rain in Athens in September?
Rain is occasional, on about 3 days.
What is the warmest month in Athens?
July, at an average high of 34°C. The coolest is January at 12°C.
How long is the flight to Athens from the UK?
About 3½h direct from London, estimated from the 2,410 km distance. Check your airline for exact times.
Still choosing? See where is hot in September for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in September from 2016 to 2025, from the Open-Meteo historical weather archive (ECMWF ERA5 reanalysis). Sea temperature is the 2023 to 2025 average from the Open-Meteo marine archive. A rainy day has at least 1 mm of rain. Reanalysis describes an area about 25 km across, so sheltered resorts can run a degree or two warmer. Flight time is a distance-based estimate from London Heathrow.
Planning Athens in September?
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