September Weather in Puerto Cortes, Costa Rica

Last updated: August 23, 2025

In September, the average temperature in Puerto Cortes, Costa Rica hovers around 24°C (75°F), making it pleasantly warm. The temperature can dip to a minimum of 20°C (68°F) and peak at a maximum of 30°C (86°F). However, be prepared for a rainy season with an average precipitation of 579 mm (22.8 in) over the course of 30 days and a high average humidity of 81%.

September Temperature in Puerto Cortes

In September in Puerto Cortes, the average temperature is 24°C (75°F). The maximum can reach 30°C (86°F), while the minimum can be as low as 20°C (68°F). This makes it an ideal time to visit for pleasant weather and outdoor activities.

September Weather in Puerto Cortes: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Puerto Cortes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Puerto Cortes, September typically has an average temperature of 24°C (75°F), with highs reaching up to 30°C (86°F) and lows dropping to around 20°C (68°F).

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

September Precipitation in Puerto Cortes

In Puerto Cortes in September, the precipitation amount is 579 mm (22.8 in) over a span of 30 days.

September Precipitation Trends in Puerto Cortes

The chart displays monthly precipitation patterns in Puerto Cortes, 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 Puerto Cortes, September typically receives around 579 mm (22.8 inches) of precipitation spread over approximately 30 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 Puerto Cortes

In Puerto Cortes in September humidity is 81%. With an average temperature of 24°C (75°F), this humidity feels like a warm, thick blanket enveloping you, making traveling a bit sticky and sweaty, yet still inviting for those who enjoy the rich, tropical atmosphere.

September Average Humidity in Puerto Cortes

This chart illustrates the average monthly humidity levels in Puerto Cortes, 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 Puerto Cortes is approximately 81%, 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 Puerto Cortes

In Puerto Cortes in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Puerto Cortes, you can check here.

Maximum UV Index Levels in Puerto Cortes for September

The chart shows the monthly maximum UV Index (UVI) for Puerto Cortes 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 Puerto Cortes typically reaches 14, which falls under the extreme exposure category.

Data source: Puerto Cortes 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 Puerto Cortes Compares to Other Months

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

This table compares monthly weather conditions in Puerto Cortes, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	24°C (75°F)	94 mm (3.7 inches)	68%	extreme
February Weather	24°C (76°F)	43 mm (1.7 inches)	68%	extreme
March Weather	25°C (77°F)	54 mm (2.1 inches)	66%	extreme
April Weather	25°C (77°F)	245 mm (9.6 inches)	67%	extreme
May Weather	24°C (76°F)	655 mm (25.8 inches)	69%	extreme
June Weather	24°C (76°F)	622 mm (24.5 inches)	84%	extreme
July Weather	24°C (76°F)	500 mm (19.7 inches)	85%	extreme
August Weather	24°C (75°F)	637 mm (25.1 inches)	82%	extreme
September Weather	24°C (75°F)	579 mm (22.8 inches)	81%	extreme
October Weather	24°C (75°F)	887 mm (34.9 inches)	80%	extreme
November Weather	23°C (74°F)	687 mm (27.0 inches)	80%	extreme
December Weather	24°C (75°F)	198 mm (7.8 inches)	72%	extreme