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September Weather in Athens, United States

Last updated: June 24, 2025

In Athens, United States, the average temperature in September hovers around 23°C (74°F), making it a comfortable time to visit. However, prepare for a temperature range that can dip to a cool 10°C (49°F) and soar up to a sizzling 37°C (98°F). With 95 mm (3.7 in) of precipitation spread over 9 days, you may encounter some wet weather. Don't forget to stay hydrated, as the average humidity is a muggy 76%!

September Temperature in Athens

In September in Athens, the average temperature is 23°C (74°F). Maximums can reach 37°C (98°F) and minimums can be as low as 10°C (49°F). This climate makes Athens a perfect destination for travelers seeking warm weather while still having the option for cooler evenings.

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 23°C (74°F), with highs reaching up to 37°C (98°F) and lows dropping to around 10°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec434854607075797874645046
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

In Athens in September, the precipitation amount is 95 mm (3.7 in) over the course of 9 days.

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 95 mm (3.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec981751621471181081071259512483137
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Athens

In Athens in September humidity is 76%. With an average temperature of 23°C (74°F), this humidity feels like a warm, thick blanket wrapping around you, making outdoor exploration feel a bit sluggish and requiring frequent breaks for hydration and respite from the heat.

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 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%82%85%85%83%76%76%80%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Athens

In Athens in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Athens.

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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810111111109753
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.

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.

This table compares monthly weather conditions in Athens, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)98 mm (3.9 inches)86%moderate
February Weather9°C (48°F)175 mm (6.9 inches)86%high
March Weather12°C (54°F)162 mm (6.4 inches)86%very high
April Weather16°C (61°F)147 mm (5.8 inches)82%very high
May Weather21°C (70°F)118 mm (4.7 inches)85%extreme
June Weather24°C (76°F)108 mm (4.3 inches)85%extreme
July Weather26°C (80°F)107 mm (4.2 inches)83%extreme
August Weather25°C (78°F)125 mm (4.9 inches)76%very high
September Weather23°C (74°F)95 mm (3.7 inches)76%very high
October Weather18°C (65°F)123 mm (4.9 inches)80%high
November Weather10°C (50°F)83 mm (3.3 inches)88%moderate
December Weather8°C (46°F)137 mm (5.4 inches)88%moderate

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