Weather in Athens

August is the warmest month (average 27.7°C, high 32.3°C) and January is the coolest (average 9.5°C, low 6.7°C). That 18.2°C swing in monthly averages is the first thing to plan around in Athens.

Rain is wet season runs from November to February, inside an annual total of 500 mm. The wettest month is December at 86 mm; the driest is August at 8 mm. Athens is in Greece at 38.0°N. The 2001–2020 NASA POWER daily record describes a Mediterranean pattern: dry summers and wetter winters. On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are May, June, and August.

Best months to visit Athens

The three months with the highest comfort score are May, June, and August: May (20.1°C average, 21 mm, 62% humidity); June (25.0°C average, 19 mm, 55% humidity); August (27.7°C average, 8 mm, 54% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the wet season itself — fewer crowds, greener landscape, heavier rain — aim at November–February instead of the score.

How warm Athens gets

Monthly average highs run from 12.3°C in January to 32.3°C in August. Nights follow the same curve: 6.7°C in January and 23.0°C in August.

Mean high across all twelve months is 22.0°C and mean low is 14.2°C. These are 20-year grid averages, so a city station can read a few degrees warmer or cooler.

Rainfall pattern

The wet season in Athens starts in November and ends in February (November, December, January, and February). December is the core of it at 86 mm. August is the other extreme, with 8 mm.

A rainy day here is a day with at least 1 mm in the NASA POWER series. December averages 10 such days; August averages 2.

The calendar in Athens

January is the coolest month, with lows around 6.7°C and highs near 12.3°C. Rainfall is 66 mm. April: 19.3°C high, 10.8°C low, 30 mm rain, 71% humidity. In May, Athens averages 24.9°C by day and 15.4°C at night, with 21 mm of rain. June brings 19 mm and 4 rainy days; temperatures run from 20.1°C to 29.9°C. Peak heat arrives in August: 32.3°C by day, 23.0°C at night, and 54% humidity.

In September, Athens averages 28.4°C by day and 20.0°C at night, with 29 mm of rain. In October, Athens averages 23.2°C by day and 16.0°C at night, with 49 mm of rain. The wet season opens in November. Expect 69 mm and 9 rainy days, with nights around 12.2°C. December is the wettest month — 86 mm and 10 rainy days, with 81% humidity.

How Athens compares inside Greece

Athens is the only Greece city in this dataset, so the figures on this page are the national sample we publish. They still come from the same NASA POWER daily series (2001–2020) used everywhere else on the site.