Athens Weather in September
Greece · Mediterranean climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Athens sees average temperatures ranging from a low of 19.7°C (67.5°F) to a high of 28.6°C (83.5°F), with a mean of 23.9°C (75.0°F). Compared to the annual average of 18.2°C (64.8°F), this month is 5.7°C warmer than the yearly norm. Precipitation averages 20.6mm, making it approximately 21.0mm drier than the monthly average of 42.0mm. The city receives an average of 11.4 hours of sunshine per day during September, with relative humidity averaging 55.8%. Wind speeds reach an average maximum of 16.8 km/h. For travelers, this month offers a temperature experience in Athens, with drier-than-average conditions compared to the rest of the year.
If you're planning to hike up Lycabettus or walk the Acropolis, go early or go home. I tried the Acropolis at 11am in August — 36°C, UV 10, zero shade, miserable. June at 7am was a different world: 24°C, golden light, mostly empty. The Meltemi wind picks up July-August afternoons, giving some relief but kicking up dust. Spring hiking around Mount Hymettus is best April-May: 20°C, wildflowers, manageable UV. Sea swims are glorious September-October when the water's still 24°C but the air cools to 26°C.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 28.3°C (82.9°F) | 23.9°C (75.0°F) | 19.2°C (66.6°F) |
| Rainfall | 18.7mm | 20.6mm | 27.9mm |
| Sunshine | 12.8 hrs | 11.4 hrs | 9.8 hrs |
| Humidity | 45.4% | 55.8% | 64.0% |
| Wind | 17.2 km/h | 16.8 km/h | 15.0 km/h |
| Rainy Days | 6.2 | 8.0 | 6.4 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Athens in September, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Athens in September?
The average temperature in Athens during September ranges from 19.7°C (67.5°F) to 28.6°C (83.5°F), with a mean of 23.9°C (75.0°F).
How much does it rain in Athens in September?
Athens receives an average of 20.6mm of precipitation in September, spread across approximately 8.0 rainy days.
What should I pack for Athens in September?
Based on September weather data, pack layers including light jackets and t-shirts, plus an umbrella.
Is September a good time to visit Athens?
September is a good time to visit Athens, with comfortable temperatures and manageable rainfall.
Other Months for Athens
Cities with Similar September Climate (Mediterranean)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 37.98°, 23.73°. Timezone: Europe/Athens. Last updated: 2026-07-30.