Piraeus weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: April – May, September – October
What is the weather like in Piraeus in September?
In September, Piraeus is hot: daytime highs average 28 °C, and nights cool down to about 20 °C. The sea averages 25.2 °C – pleasant for swimming. The sun shines for around 8 hours a day. Rain is rare: about 3 days bring 16 mm in total. On about 10 days the thermometer climbs to 30 °C or more. All in all, September is an excellent month for a holiday in Piraeus.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 63 | 89 | 91 |
| Day | 33° | 28° | 23° |
| Night | 23° | 20° | 16° |
| Sea | 26° | 25° | 23° |
| Sun | 11 h | 8 h | 6 h |
| Rain days | 1 | 3 | 4 |
More details for September
- Daylight
- 12 h 29 min07:06 – 19:35
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 5 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 23 %on averageAll months
- Hot days
- 10 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+3Europe/Athens
How the score comes together
- Temperatureweight 50 %83 %
- Sunshineweight 20 %88 %
- Few rainy daysweight 30 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
Piraeus in September: quick answers
Is Piraeus hot in September?
Yes. In September, Piraeus is hot: daytime highs average 28 °C and nights stay around 20 °C. On about 10 days the thermometer climbs to 30 °C or more.
Can you swim in Piraeus in September?
Yes. In September the sea averages 25.2 °C – pleasant for swimming.
Does it rain much in Piraeus in September?
Rain is rare: about 3 days bring 16 mm in total.
Piraeus month by month
The whole year in PiraeusAll destinations: GreeceWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences