September Weather in Athens, United States

Last updated: June 24, 2025

In Athens, United States, the average temperature in September is a pleasant 19°C (66°F). Expect minimum temperatures to dip to 2°C (36°F) and peaks reaching up to 33°C (92°F). Prepare for some rain, as precipitation averages around 86 mm (3.4 in) over 9 days, all while enjoying a relatively high average humidity of 78%.

September Temperature in Athens

In September in Athens, the average temperature is 19°C (66°F). The maximum can reach 33°C (92°F) and the minimum can be as low as 2°C (36°F). This diverse climate makes Athens an ideal destination for travelers looking to experience a range of temperatures and activities.

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 19°C (66°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (36°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 86 mm (3.4 in), falling 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 86 mm (3.4 inches) of precipitation spread over approximately 9 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 78%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making traveling quite uncomfortable unless you're well-prepared with lightweight, breathable clothing and frequent breaks to stay hydrated.

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 78%, 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 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.

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	-3°C (27°F)	71 mm (2.8 inches)	85%	moderate
February Weather	-2°C (28°F)	75 mm (2.9 inches)	85%	moderate
March Weather	3°C (38°F)	89 mm (3.5 inches)	86%	high
April Weather	8°C (48°F)	97 mm (3.8 inches)	87%	very high
May Weather	16°C (61°F)	142 mm (5.6 inches)	81%	very high
June Weather	22°C (71°F)	115 mm (4.5 inches)	82%	very high
July Weather	24°C (75°F)	120 mm (4.7 inches)	81%	very high
August Weather	22°C (72°F)	75 mm (3.0 inches)	79%	very high
September Weather	19°C (66°F)	86 mm (3.4 inches)	78%	very high
October Weather	12°C (54°F)	131 mm (5.2 inches)	81%	high
November Weather	4°C (39°F)	77 mm (3.0 inches)	89%	moderate
December Weather	0°C (33°F)	60 mm (2.4 inches)	86%	low