The regional units of Central, North, South, and West Athens, Piraeus and parts of East[9] and West Attica[10] regional units combined make up the continuous Athens Urban Area.

[13][16] The highest summer maximum temperatures are recorded in the interior of the Athens Basin and also in west areas with Nea Filadelfeia, Harokopio University and Salamina registering July mean maximum temperatures as high as 35.7°C.

[17][13][18] Due to land breezes, summer nights can be particularly hot in the south and especially around Piraeus which records an average August low of around 27°C.

During July 2024 minimum temperatures remained over 30 °C (86 °F) for 12 consecutive days in metropolitan Athens, breaking all known records for any area in the country.

[29] Lavrio is the only area in Attica that has never recorded an air frost according to the National Observatory of Athens station which operates since 2008.