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Piraeus climate by month
What the weather is like
Piraeus has a hot-summer Mediterranean climate (Köppen Csa): dry, sunny summers and mild, wetter winters.
The warmest month is July, when afternoons average 34° and nights 25°. January is the coolest month, with highs of 14° and lows of 8°. The difference between the warmest and the coolest month is about 19°.
About 407 mm of precipitation falls in an average year. January is the wettest month (54 mm, 12 wet days) and August the driest (6 mm, 2 wet days). Cloud cover ranges from 3% in July to 38% in December.
The sea reaches about 26° in August. Sea temperatures lag the air by a month or two, so late summer is usually warmer for swimming than early summer.
Compared with Athens, the capital, Piraeus is 0.4° cooler on a July afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 34° · July
- Coldest nights
- 8° · January
- Wettest month
- January
- Driest month
- August
- Clearest skies
- July · 3% cloud
- Warmest sea
- 26° · August
- Longest day
- 14 h 47 min
- Shortest day
- 9 h 33 min
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columns, sea temperature lineTemperature curve
Average high, low and seaDaylight
Hours between sunrise and sunset on the 15th of each monthClimate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 14° | 15° | 17° | 21° | 26° | 32° | 34° | 34° | 30° | 24° | 19° | 15° |
| Average low | 8° | 8° | 10° | 13° | 17° | 22° | 25° | 25° | 21° | 17° | 13° | 9° |
| Precipitation | 54 mm | 41 mm | 48 mm | 34 mm | 18 mm | 8 mm | 9 mm | 6 mm | 16 mm | 37 mm | 66 mm | 70 mm |
| Wet days (≥1 mm) | 11.5 | 10 | 8 | 5.5 | 5 | 4 | 2.3 | 1.5 | 5.3 | 6.4 | 8.6 | 10.3 |
| Cloud cover | 35% | 33% | 30% | 25% | 19% | 7% | 3% | 3% | 9% | 22% | 33% | 38% |
| Sea temperature | 15° | 15° | 15° | 16° | 19° | 22° | 25° | 26° | 25° | 23° | 20° | 17° |
| Daylight | 9h 49 | 10h 48 | 11h 55 | 13h 10 | 14h 13 | 14h 47 | 14h 33 | 13h 39 | 12h 28 | 11h 16 | 10h 09 | 9h 33 |
| Saharan dust haze | – | – | ● | ● | ●● | ● | – | – | – | – | – | – |
| Month score | 47 | 57 | 76 | 87 | 83 | 63 | 56 | 58 | 68 | 85 | 78 | 55 |
Dust haze, monthly average 2015–2024: ● occasional, ●● frequent, ●●● very frequent