September Weather in Rio, Greece

Last updated: August 23, 2025

In September, the average temperature in Rio, Greece is a pleasant 23°C (73°F). Expect a minimum of 12°C (54°F) and a maximum of 35°C (95°F), offering a wide range of comfort. While you enjoy the weather, keep in mind that precipitation can reach 49 mm (1.9 in) over about 4 days, and the average humidity sits at 56%. Prepare for a mix of sunny and occasionally wet days!

September Temperature in Rio

In September in Rio, the average temperature is 23°C (73°F), with maximums reaching up to 35°C (95°F) and minimums dropping as low as 12°C (54°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

September Weather in Rio: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio, September typically has an average temperature of 23°C (73°F), with highs reaching up to 35°C (95°F) and lows dropping to around 12°C (54°F).

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

September Precipitation in Rio

In Rio in September, the total precipitation amount is 49 mm (1.9 in) spread over a duration of 4 days.

September Precipitation Trends in Rio

The chart displays monthly precipitation patterns in Rio, 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 Rio, September typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 4 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 Rio

In Rio in September, humidity is 56%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace that makes traveling feel slightly sticky, yet still comfortable enough to explore outdoors without feeling overwhelmed.

September Average Humidity in Rio

This chart illustrates the average monthly humidity levels in Rio, 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 Rio is approximately 56%, 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 Rio

In Rio 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 Rio.

Maximum UV Index Levels in Rio for September

The chart shows the monthly maximum UV Index (UVI) for Rio 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 Rio typically reaches 8, which falls under the very high exposure category.

Data source: Rio 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 Rio Compares to Other Months

Weather in Rio varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Rio, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Rio, 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)	147 mm (5.8 inches)	84%	moderate
February Weather	9°C (49°F)	103 mm (4.1 inches)	78%	moderate
March Weather	10°C (51°F)	97 mm (3.8 inches)	75%	high
April Weather	14°C (57°F)	55 mm (2.2 inches)	70%	very high
May Weather	18°C (65°F)	37 mm (1.5 inches)	72%	very high
June Weather	22°C (72°F)	40 mm (1.6 inches)	60%	extreme
July Weather	26°C (79°F)	23 mm (0.9 inches)	56%	very high
August Weather	27°C (80°F)	17 mm (0.7 inches)	47%	very high
September Weather	23°C (73°F)	49 mm (1.9 inches)	56%	very high
October Weather	18°C (64°F)	76 mm (3.0 inches)	70%	high
November Weather	14°C (58°F)	127 mm (5.0 inches)	80%	moderate
December Weather	10°C (50°F)	178 mm (7.0 inches)	83%	moderate