September Weather in Athens, United States

Last updated: June 24, 2025

In September, the average temperature in Athens, United States is a comfortable 15°C (60°F). However, don't be surprised if you experience a chill with nights dipping to a minimum of -1°C (30°F) or feel the warmth with highs reaching up to 32°C (90°F). Be prepared for some rain, as the area sees an average precipitation of 73 mm (2.9 in) over 8 days, accompanied by an average humidity of 77%.

September Temperature in Athens

In September in Athens, the average temperature is 15°C (60°F), with maximums reaching up to 32°C (90°F) and minimums dipping as low as -1°C (30°F). This makes Athens an ideal destination for travelers seeking a mix of warm days and cool 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 15°C (60°F), with highs reaching up to 32°C (90°F) and lows dropping to around -1°C (30°F).

Data source: Temperature data for Athens generated using information from the Copernicus Climate Change Service.

September Precipitation in Athens

In Athens in September, the precipitation amount is 73 mm (2.9 in) over a span of 8 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 73 mm (2.9 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Athens

In Athens in September, humidity is 77%. With an average temperature of 15°C (60°F), this humidity feels like you're wading through a warm, heavy blanket, making travel feel more exhausting and sticky than usual.

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 77%, offering insight into how humid the weather typically is during this month.

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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more 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 7, which falls under the high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (18°F)	87 mm (3.4 inches)	88%	low
February Weather	-7°C (21°F)	83 mm (3.3 inches)	88%	moderate
March Weather	-2°C (28°F)	74 mm (2.9 inches)	85%	moderate
April Weather	5°C (41°F)	125 mm (4.9 inches)	81%	very high
May Weather	12°C (54°F)	91 mm (3.6 inches)	76%	very high
June Weather	17°C (63°F)	87 mm (3.4 inches)	74%	very high
July Weather	20°C (69°F)	104 mm (4.1 inches)	74%	very high
August Weather	20°C (67°F)	79 mm (3.1 inches)	74%	very high
September Weather	15°C (60°F)	73 mm (2.9 inches)	77%	high
October Weather	9°C (48°F)	131 mm (5.2 inches)	82%	moderate
November Weather	1°C (34°F)	112 mm (4.4 inches)	85%	moderate
December Weather	-5°C (23°F)	120 mm (4.7 inches)	84%	low