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Average Weather in Piraeus Greece

In Piraeus, the summers are hot, dry, and clear and the winters are long, cold, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 43°F to 92°F and is rarely below 36°F or above 98°F.

Based on the beach/pool score, the best time of year to visit Piraeus for hot-weather activities is from mid June to mid September.

Climate Summary

coolwarmhotwarmcoolJanFebMarAprMayJunJulAugSepOctNovDecNowNow99%99%56%56%clearovercastprecipitation: 2.6 inprecipitation: 2.6 in0.2 in0.2 inmuggy: 12%muggy: 12%0%0%drydrybeach/pool score: 9.1beach/pool score: 9.10.00.0
Click on each chart for more information.

Temperature

The hot season lasts for 3.0 months, from June 12 to September 12, with an average daily high temperature above 85°F. The hottest day of the year is July 29, with an average high of 92°F and low of 75°F.

The cool season lasts for 4.1 months, from November 24 to March 27, with an average daily high temperature below 63°F. The coldest day of the year is February 6, with an average low of 43°F and high of 55°F.

Average High and Low Temperature

Average High and Low Temperature in PiraeushotcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FFeb 655°FFeb 655°FJul 2992°FJul 2992°F43°F43°F75°F75°FJun 1285°FJun 1285°FSep 1285°FSep 1285°FNov 2463°FNov 2463°FMar 2763°FMar 2763°F68°F68°F69°F69°F51°F51°F48°F48°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in PiraeusJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowcoldcoldcoldcoolcoolwarmhotcomfortablecomfortablecool
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Jianjiang, China (5,429 miles away) and Kagoshima, Japan (5,723 miles) are the far-away foreign places with temperatures most similar to Piraeus (view comparison).

Clouds

In Piraeus, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Piraeus begins around May 29 and lasts for 3.9 months, ending around September 25. On July 20, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 99% of the time, and overcast or mostly cloudy 1% of the time.

The cloudier part of the year begins around September 25 and lasts for 8.1 months, ending around May 29. On December 13, the cloudiest day of the year, the sky is overcast or mostly cloudy 44% of the time, and clear, mostly clear, or partly cloudy 56% of the time.

Cloud Cover Categories

Cloud Cover Categories in PiraeusclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 2099%Jul 2099%Dec 1356%Dec 1356%May 2977%May 2977%Sep 2577%Sep 2577%NowNowclearmostly clearmostly cloudyovercastpartly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Piraeus varies throughout the year.

The wetter season lasts 5.9 months, from October 20 to April 16, with a greater than 14% chance of a given day being a wet day. The chance of a wet day peaks at 26% on November 27.

The drier season lasts 6.1 months, from April 16 to October 20. The smallest chance of a wet day is 3% on July 25.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 26% on November 27.

Daily Chance of Precipitation

Daily Chance of Precipitation in PiraeuswetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Nov 2726%Nov 2726%Jul 253%Jul 253%Oct 2014%Oct 2014%Apr 1614%Apr 1614%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Piraeus experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.6 months, from September 15 to June 2, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around November 24, with an average total accumulation of 2.6 inches.

The rainless period of the year lasts for 3.4 months, from June 2 to September 15. The least rain falls around August 2, with an average total accumulation of 0.2 inches.

Average Monthly Rainfall

Average Monthly Rainfall in PiraeusrainrainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 inNov 242.6 inNov 242.6 inAug 20.2 inAug 20.2 inSep 150.5 inSep 150.5 inJun 20.5 inJun 20.5 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in Piraeus varies significantly over the course of the year. In 2021, the shortest day is December 21, with 9 hours, 32 minutes of daylight; the longest day is June 21, with 14 hours, 48 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in PiraeusJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2014 hr, 48 minJun 2114 hr, 48 minJun 2112 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 32 minDec 219 hr, 32 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 6:02 AM on June 13, and the latest sunrise is 1 hour, 47 minutes later at 7:49 AM on October 30. The earliest sunset is at 5:05 PM on December 6, and the latest sunset is 3 hours, 46 minutes later at 8:51 PM on June 28.

Daylight saving time (DST) is observed in Piraeus during 2021, starting in the spring on March 28, lasting 7.1 months, and ending in the fall on October 31.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in PiraeusJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 136:02 AMJun 136:02 AM8:51 PMJun 288:51 PMJun 28Dec 65:05 PMDec 65:05 PM7:49 AMOct 307:49 AMOct 30Mar 28DSTMar 28DSTDSTOct 31DSTOct 31daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2021. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Moon

The figure below presents a compact representation of key lunar data for 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Piraeus experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.0 months, from June 16 to October 14, during which time the comfort level is muggy, oppressive, or miserable at least 3% of the time. The muggiest day of the year is August 8, with muggy conditions 12% of the time.

The least muggy day of the year is February 28, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in PiraeusmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 280%Feb 280%Aug 812%Aug 812%Jun 163%Jun 163%Oct 143%Oct 143%NowNowhumidhumidcomfortablecomfortabledrydrymuggymuggy
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Piraeus experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.4 months, from October 11 to March 24, with average wind speeds of more than 9.5 miles per hour. The windiest day of the year is February 4, with an average hourly wind speed of 11.2 miles per hour.

The calmer time of year lasts for 6.6 months, from March 24 to October 11. The calmest day of the year is June 1, with an average hourly wind speed of 7.8 miles per hour.

Average Wind Speed

Average Wind Speed in PiraeuswindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mphFeb 411.2 mphFeb 411.2 mphJun 17.8 mphJun 17.8 mphOct 119.5 mphOct 119.5 mphMar 249.5 mphMar 249.5 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Piraeus is from the north throughout the year.

Wind Direction

Wind Direction in PiraeusJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Piraeus is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.3 months, from June 26 to October 4, with an average temperature above 74°F. The day of the year with the warmest water is August 13, with an average temperature of 78°F.

The time of year with cooler water lasts for 4.3 months, from December 19 to April 29, with an average temperature below 62°F. The day of the year with the coolest water is February 28, with an average temperature of 58°F.

Average Water Temperature

Average Water Temperature in PiraeuswarmcoolJanFebMarAprMayJunJulAugSepOctNovDec55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°FAug 1378°FAug 1378°F58°FFeb 2858°FFeb 28Jun 2674°FJun 2674°FOct 474°FOct 474°FDec 1962°FDec 1962°FApr 2962°FApr 2962°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Piraeus throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Piraeus for general outdoor tourist activities are from late April to late June and from early September to mid October, with a peak score in the last week of May.

Tourism Score

Tourism Score in Piraeusbest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810108.18.12.42.48.08.05.95.9NowNowprecipitationprecipitationcloudscloudstemperaturetemperature tourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Piraeus for hot-weather activities is from mid June to mid September, with a peak score in the first week of July.

Beach/Pool Score

Beach/Pool Score in Piraeusbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810109.19.10.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature beach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

While it does not do so every year, freezing temperatures are seen in Piraeus over some winters. The day least likely to be in the growing season is January 16, with a 55% chance.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Piraeusgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%90%Mar 290%Mar 290%Dec 2290%Dec 2255%Jan 1655%Jan 16Jul 30100%Jul 30100%NowNowvery coldcoldcoolwarmhotcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Piraeus should appear around February 4, only rarely appearing before January 21 or after February 25.

Growing Degree Days

Growing Degree Days in PiraeusJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°F6,000°F6,000°FFeb 487°FFeb 487°FMay 17900°FMay 17900°FJun 241,800°FJun 241,800°FDec 315,627°FDec 315,627°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.5 months, from May 8 to August 23, with an average daily incident shortwave energy per square meter above 6.9 kWh. The brightest day of the year is July 6, with an average of 8.1 kWh.

The darker period of the year lasts for 3.5 months, from October 31 to February 15, with an average daily incident shortwave energy per square meter below 3.3 kWh. The darkest day of the year is December 21, with an average of 2.1 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in PiraeusbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJul 68.1 kWhJul 68.1 kWhDec 212.1 kWhDec 212.1 kWhMay 86.9 kWhMay 86.9 kWhAug 236.9 kWhAug 236.9 kWhOct 313.3 kWhOct 313.3 kWhFeb 153.3 kWhFeb 153.3 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Piraeus are 37.947 deg latitude, 23.637 deg longitude, and 46 ft elevation.

The topography within 2 miles of Piraeus contains only modest variations in elevation, with a maximum elevation change of 456 feet and an average elevation above sea level of 64 feet. Within 10 miles contains only modest variations in elevation (3,537 feet). Within 50 miles also contains extreme variations in elevation (5,889 feet).

The area within 2 miles of Piraeus is covered by artificial surfaces (73%) and water (22%), within 10 miles by water (44%) and artificial surfaces (36%), and within 50 miles by water (54%) and cropland (12%).

Data Sources

This report illustrates the typical weather in Piraeus, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Piraeus.

For each station, the records are corrected for the elevation difference between that station and Piraeus according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Piraeus is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Piraeus and a given station.

The stations contributing to this reconstruction are: Ellinikón Airport (60%, 11 kilometers, southeast); Elefsis Airport (39%, 15 kilometers, northwest); and Tripoli Airport (1.5%, 118 kilometers, southwest).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.