September Weather in Athens, United States

Last updated: June 24, 2025

In September, the average temperature in Athens, United States is a pleasant 24°C (75°F). Daily highs can reach up to 35°C (96°F), while lows may drop to 10°C (50°F). Expect an average precipitation of 120 mm (4.7 in) over 9 days, contributing to a relatively high average humidity of 82%. Overall, it's a month that beautifully balances warm days and refreshing rainfall.

September Temperature in Athens

In September in Athens, the average temperature is 24°C (75°F). Maximums can reach 35°C (96°F), and minimums can be as low as 10°C (50°F). Overall, this climate makes Athens an ideal destination for travelers seeking pleasant weather and a range of outdoor 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 24°C (75°F), with highs reaching up to 35°C (96°F) and lows dropping to around 10°C (50°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 120 mm (4.7 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 120 mm (4.7 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Athens

In Athens in September, humidity is 82%. With an average temperature of 24°C (75°F), this humidity feels like a warm embrace, making travel feel sticky and heavy on the skin, often requiring more frequent breaks and hydration.

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 82%, 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 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.

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 (46°F)	106 mm (4.2 inches)	86%	moderate
February Weather	11°C (51°F)	140 mm (5.5 inches)	84%	high
March Weather	13°C (56°F)	116 mm (4.6 inches)	83%	very high
April Weather	17°C (63°F)	122 mm (4.8 inches)	81%	very high
May Weather	22°C (71°F)	126 mm (5.0 inches)	81%	extreme
June Weather	25°C (77°F)	113 mm (4.5 inches)	81%	extreme
July Weather	26°C (80°F)	115 mm (4.5 inches)	83%	extreme
August Weather	26°C (79°F)	132 mm (5.2 inches)	81%	very high
September Weather	24°C (75°F)	120 mm (4.7 inches)	82%	very high
October Weather	19°C (66°F)	134 mm (5.3 inches)	78%	very high
November Weather	11°C (53°F)	80 mm (3.1 inches)	86%	high
December Weather	9°C (49°F)	132 mm (5.2 inches)	89%	moderate