September Weather in Athens, Greece

Last updated: August 21, 2025

September in Athens, Greece welcomes a warm transition from summer to autumn, with maximum temperatures reaching up to 37°C (98°F) and an average of 24°C (76°F), perfect for outdoor explorations. As the month unfolds, nights cool down to a pleasant minimum of 13°C (55°F), offering a comfortable respite. While the city experiences low precipitation of just 17 mm (0.7 in) over two days, the humidity level remains at a moderate 65%, making it a delightful time to soak in both the historical and cultural richness of Athens.

September Temperature in Athens

September in Athens, Greece, heralds a transition from the intense summer heat, providing a more comfortable climate for visitors and locals alike. With minimum temperatures averaging 13°C (55°F) and maxing out at a warm 37°C (98°F), the month offers a pleasant average of 24°C (76°F). As the summer crowds begin to thin, the milder weather invites outdoor exploration of the city's ancient sites and vibrant neighborhoods. This blend of warmth and sunshine ensures that September remains a delightful time to experience the rich culture and history of Athens, making it a favored month for both travelers and locals.

September Weather in Athens: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Athens, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Athens, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec485154606977838376665952
Data source: Temperature data for Athens generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Athens

September in Athens marks a transition from the dry summer months to a slight uptick in precipitation. With 17 mm (0.7 inches) of rain typically falling over 2 days, this increase is modest but significant compared to the parched months of July and August, which see virtually no rainfall. As autumn approaches, the city experiences a refreshing change, paving the way for more frequent and heavier rain in the following months. The patterns show that while summer sees minimal precipitation, September acts as a gentle precursor to the wetter fall, setting the stage for the 30 mm (1.2 inches) expected in October and beyond. The gradual increase in rainfall not only cools the air but also nourishes the vibrant landscapes that Athens is known for.

September Precipitation Trends in Athens

The chart displays monthly precipitation patterns in Athens, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Athens, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec5748394223339417304866
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Athens

In September, Athens experiences a slight increase in humidity, reaching 65%, which is a moderate level compared to the summer months. Following the sweltering heat of July and August, when humidity levels dipped to a low of 63%, this shift indicates a gradual transition into the more temperate autumn months. As temperatures begin to cool, humidity levels start to rise again, echoing the patterns seen in the earlier months of the year. Specifically, the levels in September not only serve as a bridge to the crispness of October and November but also highlight the Mediterranean's characteristic climate fluctuations, where warmth and moisture interplay throughout the year.

September Average Humidity in Athens

This chart illustrates the average monthly humidity levels in Athens, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Athens is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%74%75%77%72%68%63%65%72%75%76%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Athens

In September, Athens, Greece, experiences a notable decline in UV Index levels, registering at 8, which still falls within the very high exposure category. This marks a decrease from the scorching heights of 10 seen from May to August. Consequently, while the burn time remains brisk at just 15 minutes, the slightly lower UV Index offers a brief respite from the sun's intensity, making outdoor activities more enjoyable yet still requiring caution. As the month progresses into autumn, individuals should remain vigilant about sun protection, especially during midday hours. For more detailed insights on UV exposure in this vibrant city, explore the Athens UV Index.

Maximum UV Index Levels in Athens for September

The chart shows the monthly maximum UV Index (UVI) for Athens in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Athens typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468101010108743
Data source: Athens September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Athens

As summer gently wanes, September in Athens still basks in the warmth of the sun, boasting a healthy 346 hours of sunshine. Although this marks a decline from the sun-drenched peaks of July and June, with their impressive 423 and 409 hours respectively, September offers a delightful transition as the bustling tourist season begins to ease. The month reflects a lingering warmth, reminiscent of the vibrant days in August with its 396 hours, while simultaneously laying the groundwork for a more serene autumn. This unique blend of summer's embrace and the onset of cooler temperatures ensures that September remains a captivating month to explore the ancient streets of this historic city.

Monthly Sunshine Duration in Athens: September Highlighted

The September sunshine duration represents the total number of hours Athens experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec200h252h328h346h398h409h423h396h346h313h261h250h
Data source: Athens September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Athens During September

September in Athens, Greece, offers a delightful blend of warm sunshine and cooler breezes, with a 77% chance of sunny weather. As summer transitions into autumn, this month retains a significant amount of brightness, although it marks a gradual decrease from the scorching heights of 94% in July and 95% in August. The lingering warmth and extended daylight make September a particularly inviting time to explore the city's rich history and stunning landscapes. Compared to earlier months like January (45%) and February (58%), September stands out as a favorable choice for sun-seekers, offering a satisfying balance between summer's vibrancy and the onset of fall.

Percentage of Sunny Days in September in Athens

The chart illustrates the percentage of sunny days in Athens throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Athens experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec45%58%57%55%70%71%94%95%77%57%40%51%
Data source: Athens September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Athens in September

As summer gracefully draws to a close, September in Athens, Greece, marks a subtle transition in daylight duration, with the average day basking in 12 hours of light. This month showcases a gentle decline from the peak 14 hours of sunlight experienced in the height of summer, reflecting the gradual shift towards autumn. As the sun begins to set earlier, the changing light casts a warm glow over the city's ancient landmarks, inviting locals and visitors alike to embrace the serene beauty of September evenings. This month stands out as a bridge between the lingering warmth of summer and the cooler hues of autumn, offering a perfect balance for enjoying outdoor activities and cultural experiences in this historic city.

Average Daylight Hours in Athens for September

The chart illustrates the variation in daylight duration in Athens throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 50m10h 46m11h 58m13h 11m14h 14m14h 44m14h 28m13h 33m12h 23m11h 10m10h 6m9h 33m
Data source: Athens daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Athens

As September sweeps into Athens, the city welcomes a gentle breeze with an average wind speed of 3.0 m/s (7 mph), reminiscent of the calmer summer months. This slight uptick from August's 2.7 m/s suggests a bid farewell to the sweltering heat, as the winds begin to shift. Throughout the year, the wind typically dances around a lower 2.4 to 3.5 m/s range, with the cooler months in October and November maintaining this stealthy yet consistent pace at 3.1 m/s (7 mph) and 3.0 m/s (7 mph), respectively. The invigorating feeling of the September wind signifies a transition, heralding the onset of autumn and inviting both locals and visitors to indulge in the beautiful outdoor experiences the city has to offer.

Average September Wind Speed in Athens

The chart displays monthly wind speed patterns in Athens, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.23.02.92.62.41.83.12.73.0 m/s3.13.03.5
Data source: Athens September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Athens Compares to Other Months

Weather in Athens varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Athens, focusing on differences in temperature, rainfall, humidity, and UV levels.

September and January present stark contrasts in weather patterns. In September, temperatures can range widely, with a minimum of 13°C (55°F) and an average of 24°C (76°F), peaking at 37°C (98°F). The month typically sees moderate precipitation of 17 mm (0.7 in) over just 2 days, accompanied by a humidity level of 65%. In contrast, January is much colder, with minimum temperatures dropping to -4°C (25°F) and an average of 9°C (48°F), while the maximum temperature reaches 22°C (72°F). This month is wetter, recording 57 mm (2.2 in) of precipitation across 7 days and higher humidity at 76%. For more detailed information on January's weather, you can check Athens weather in January.

September and February present stark contrasts in weather conditions. In September, temperatures typically range from a minimum of 13°C (55°F) to a maximum of 37°C (98°F), providing warm days with an average of 24°C (76°F). Precipitation is relatively low, with just 17 mm (0.7 in) over about 2 days, and humidity hovers around 65%. In contrast, February is cooler, featuring temperatures from 0°C (32°F) to a maximum of 20°C (68°F), with an average of only 10°C (51°F). It is also wetter, with 48 mm (1.9 in) of rain occurring across 8 days and humidity rising to 75%. For more detailed insights, you can check Athens weather in February.

When comparing the weather in September and March, we see notable differences in temperature and precipitation. September enjoys warmer temperatures, with averages around 24°C (76°F) and highs reaching up to 37°C (98°F), while March is considerably cooler, with an average of 12°C (54°F) and maximums capped at 23°C (74°F). In terms of precipitation, March is wetter, receiving 39 mm (1.5 in) over roughly five days, compared to September's lighter rainfall of 17 mm (0.7 in) spread over just two days. Humidity levels are also higher in March at 74%, compared to September's 65%. For more details, check Athens weather in March.

When comparing the weather in September and April, notable differences emerge in both temperature and precipitation. September typically enjoys warmer temperatures, with an average of 24°C (76°F) and maximums reaching up to 37°C (98°F). In contrast, April is much cooler, averaging only 15°C (60°F) and peaking at 29°C (85°F). Additionally, April experiences more rainfall, with a total of 42 mm (1.6 in) over five days, compared to September's lighter precipitation of 17 mm (0.7 in) over just two days. The humidity levels are also higher in April at 75%, compared to 65% in September. For a detailed look at how these conditions play out, check out Athens weather in April.

September and May in Athens display distinct weather patterns. In September, temperatures range from a minimum of 13°C (55°F) to a maximum of 37°C (98°F), with an average of 24°C (76°F) and relatively low precipitation of 17 mm (0.7 in) over just 2 days. The humidity sits at 65%, making for a warm and somewhat comfortable atmosphere. In contrast, May experiences slightly cooler temperatures with a minimum of 10°C (51°F) and a maximum of 36°C (97°F), averaging 21°C (70°F). This month witnesses more rainfall at 23 mm (0.9 in) across 4 days, accompanied by higher humidity levels at 77%. For a more detailed look at May weather, check out Athens weather in May.

In comparing the weather of September and June, we see that both months enjoy warm temperatures, but there are some notable differences. September features a minimum temperature of 13°C (55°F), averaging 24°C (76°F), and peaking at 37°C (98°F), with relatively low precipitation of 17 mm (0.7 in) over just 2 days. In contrast, June has a slightly higher average temperature of 25°C (77°F), with a maximum reaching 38°C (101°F) and more precipitation at 33 mm (1.3 in) over 5 days. Additionally, June experiences higher humidity levels at 71% compared to September's 65%. For more details, you can visit Athens weather in June.

In comparing the weather of September and July, we see notable differences in temperature and humidity levels. September experiences milder temperatures, with a minimum of 13°C (55°F) and an average of 24°C (76°F), while July is significantly hotter, presenting a minimum of 19°C (67°F) and an average of 28°C (83°F). The maximum temperatures in July can reach a scorching 42°C (108°F), whereas September peaks at a more comfortable 37°C (98°F). Both months see limited precipitation, with September receiving about 17 mm (0.7 in) over 2 days and July slightly less at 9 mm (0.4 in) over the same duration. Humidity is slightly higher in July, at 68%, compared to September's 65%. For a closer look at the specifics, you can visit Athens weather in July.

In comparing the weather between September and August, September generally offers a more moderate climate. The average temperature in September is 24°C (76°F), with a maximum of 37°C (98°F), which is notably cooler than August's average of 28°C (83°F) and a peak of 43°C (109°F). Additionally, September experiences brief precipitation over two days, totaling 17 mm (0.7 in), while August remains dry with only 4 mm (0.2 in) of rain throughout the month. Humidity levels are fairly similar, with September at 65% and August at 63%. For a deeper dive into specific patterns, you can check this resource: Athens weather in August.

September and October showcase a notable transition in weather patterns. In September, temperatures range from a minimum of 13°C (55°F) to a scorching maximum of 37°C (98°F), with an average of 24°C (76°F). The month sees relatively low precipitation, just 17 mm (0.7 in), over 2 days, and humidity sits at 65%. In contrast, October brings cooler temperatures, with a minimum of 7°C (45°F) and a maximum of 31°C (89°F), averaging 19°C (66°F). Precipitation increases to 30 mm (1.2 in) over 4 days, and humidity rises slightly to 72%. This shift marks a transition into a more temperate autumn, making it a delightful time for outdoor activities. For more details, check Athens weather in October.

In September, the weather is characterized by warm temperatures, with a minimum of 13°C (55°F) and an average high reaching up to 37°C (98°F). The month experiences relatively low precipitation, averaging just 17 mm (0.7 in) over two rainy days, along with a humidity level of 65%.

In contrast, November brings much cooler conditions, featuring a minimum temperature of 4°C (39°F) and an average high of 25°C (78°F). The precipitation increases significantly to 48 mm (1.9 in) spread over seven days, and humidity rises to 75%. This shift indicates a transition from the warmth of summer to the chill of winter. For more details, you can check Athens weather in November.

September weather in Athens features warm temperatures, with an average of 24°C (76°F) and highs reaching up to 37°C (98°F). The month experiences limited rainfall, with only 17 mm (0.7 in) across about two days and humidity levels around 65%. In contrast, December brings a cooler and wetter climate, with average temperatures dropping to 11°C (53°F) and highs of 21°C (70°F). This month has significantly more precipitation, totaling 66 mm (2.6 in) over roughly nine days, and a higher humidity level of 76%. For more details, visit Athens weather in December.

Compare Athens's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Athens

As September arrives in Athens, the sweltering heat of summer begins to ease, offering a more comfortable atmosphere for visitors. With an average temperature settling around a pleasant 24°C (76°F), the city enjoys warmer days that gradually transition into cooler evenings. Unlike the drenched summer months, September experiences minimal rainfall, with only a couple of days of light precipitation throughout the month. The humidity remains moderate at 65%, creating a balance that enhances outdoor exploration. For those looking to discover the city’s rich history and vibrant culture without the July and August crowds, September strikes the perfect balance. For more insight into what to expect year-round, check out Athens Climate.