September Weather in Carrillos, Costa Rica

Last updated: August 23, 2025

In September, the average temperature in Carrillos, Costa Rica hovers around 20°C (69°F), with a comfortable range between 15°C (60°F) and 27°C (80°F). Expect moderate rainfall during this period, with a total precipitation of 436 mm (17.2 in) spread over 28 days. Moreover, the average humidity sits at a lush 81%, creating a uniquely vibrant atmosphere.

September Temperature in Carrillos

In September in Carrillos, the average temperature is 20°C (69°F). Maximums can reach 27°C (80°F), while minimums can dip as low as 15°C (60°F). This pleasant climate makes it an ideal time for outdoor adventures and exploring all that Carrillos has to offer.

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

The chart illustrates September temperature patterns in Carrillos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Carrillos, September typically has an average temperature of 20°C (69°F), with highs reaching up to 27°C (80°F) and lows dropping to around 15°C (60°F).

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

September Precipitation in Carrillos

In Carrillos in September, the precipitation amount is 436 mm (17.2 in) over the course of 28 days.

September Precipitation Trends in Carrillos

The chart displays monthly precipitation patterns in Carrillos, 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 Carrillos, September typically receives around 436 mm (17.2 inches) of precipitation spread over approximately 28 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 Carrillos

In Carrillos in September, humidity is 81%. With an average temperature of 20°C (69°F), this humidity feels like a thick blanket embracing you, making travel a bit uncomfortable and sticky.

September Average Humidity in Carrillos

This chart illustrates the average monthly humidity levels in Carrillos, 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 Carrillos 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 Carrillos

In Carrillos in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Carrillos.

Maximum UV Index Levels in Carrillos for September

The chart shows the monthly maximum UV Index (UVI) for Carrillos 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 Carrillos typically reaches 13, which falls under the extreme exposure category.

Data source: Carrillos 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 Carrillos Compares to Other Months

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

This table compares monthly weather conditions in Carrillos, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	20°C (68°F)	32 mm (1.3 inches)	68%	extreme
February Weather	20°C (69°F)	13 mm (0.5 inches)	68%	extreme
March Weather	21°C (70°F)	15 mm (0.6 inches)	66%	extreme
April Weather	21°C (70°F)	79 mm (3.1 inches)	67%	extreme
May Weather	21°C (70°F)	391 mm (15.4 inches)	69%	extreme
June Weather	21°C (70°F)	351 mm (13.8 inches)	84%	extreme
July Weather	21°C (69°F)	233 mm (9.2 inches)	85%	extreme
August Weather	20°C (69°F)	331 mm (13.0 inches)	82%	extreme
September Weather	20°C (69°F)	436 mm (17.2 inches)	81%	extreme
October Weather	20°C (68°F)	570 mm (22.4 inches)	80%	extreme
November Weather	20°C (68°F)	209 mm (8.2 inches)	80%	extreme
December Weather	20°C (68°F)	63 mm (2.5 inches)	72%	very high