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September Weather in Athens, United States

Last updated: June 24, 2025

In September, the average temperature in Athens, United States hovers around 21°C (70°F). However, be prepared for a range, with minimums dipping to 6°C (42°F) and peaks soaring up to 37°C (98°F). This month also sees an average precipitation of 103 mm (4.0 in) spread over about 9 days, and you'll experience a relatively high humidity level of 73%.

September Temperature in Athens

In September in Athens, the average temperature is 21°C (70°F). Maximum temperatures can reach 37°C (98°F), while minimums can drop to as low as 6°C (42°F). Be prepared for a wide range of temperatures, ideal for both warm-weather activities and cooler evening outings.

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 21°C (70°F), with highs reaching up to 37°C (98°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec343845546572777570594439
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 103 mm (4.0 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 103 mm (4.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec8912511614014214811112410310783116
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 73%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace that can make outdoor activities feel sweltering, so it's essential to stay hydrated and take breaks in the shade while exploring.

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 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%87%82%84%82%73%74%81%89%86%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098653
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 Weather1°C (34°F)89 mm (3.5 inches)88%moderate
February Weather3°C (38°F)125 mm (4.9 inches)88%moderate
March Weather7°C (45°F)116 mm (4.5 inches)88%high
April Weather12°C (54°F)140 mm (5.5 inches)86%very high
May Weather18°C (65°F)142 mm (5.6 inches)82%very high
June Weather22°C (72°F)148 mm (5.8 inches)84%very high
July Weather25°C (77°F)111 mm (4.4 inches)82%very high
August Weather24°C (75°F)124 mm (4.9 inches)73%very high
September Weather21°C (70°F)103 mm (4.0 inches)73%very high
October Weather15°C (60°F)107 mm (4.2 inches)81%high
November Weather7°C (44°F)83 mm (3.3 inches)89%moderate
December Weather4°C (39°F)116 mm (4.6 inches)86%moderate

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