September Weather in Los Chiles, Costa Rica

Last updated: August 23, 2025

In September, the average temperature in Los Chiles, Costa Rica hovers around 26°C (79°F), offering a warm climate that's ideal for exploration. Expect minimum temperatures to dip to 21°C (71°F), while maximum highs can soar to 34°C (93°F). During this month, anticipate precipitation totaling 296 mm (11.7 in) spread over 29 days, contributing to an average humidity of 84%. Be prepared for a humid experience!

September Temperature in Los Chiles

In September, in Los Chiles, the average temperature is 26°C (79°F). The maximum can reach 34°C (93°F) and the minimum can be as low as 21°C (71°F). This pleasant weather makes Los Chiles an ideal destination for travelers seeking warmth and comfort.

September Weather in Los Chiles: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Los Chiles, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Los Chiles, September typically has an average temperature of 26°C (79°F), with highs reaching up to 34°C (93°F) and lows dropping to around 21°C (71°F).

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

September Precipitation in Los Chiles

In Los Chiles, in September, the precipitation amount is 296 mm (11.7 in) over the course of 29 days.

September Precipitation Trends in Los Chiles

The chart displays monthly precipitation patterns in Los Chiles, 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 Los Chiles, September typically receives around 296 mm (11.7 inches) of precipitation spread over approximately 29 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 Los Chiles

In Los Chiles in September, humidity is 84%. With an average temperature of 26°C (79°F), this humidity feels like a warm, heavy blanket enveloping you, making travel feel sticky and exhausting, yet the vibrant atmosphere and lush surroundings offer a refreshing allure that invites exploration.

September Average Humidity in Los Chiles

This chart illustrates the average monthly humidity levels in Los Chiles, 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 Los Chiles is approximately 84%, 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 Los Chiles

In Los Chiles 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 Los Chiles.

Maximum UV Index Levels in Los Chiles for September

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

Data source: Los Chiles 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 Los Chiles Compares to Other Months

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

This table compares monthly weather conditions in Los Chiles, 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 (76°F)	120 mm (4.7 inches)	71%	extreme
February Weather	25°C (77°F)	75 mm (3.0 inches)	70%	extreme
March Weather	25°C (78°F)	84 mm (3.3 inches)	68%	extreme
April Weather	26°C (80°F)	70 mm (2.7 inches)	69%	extreme
May Weather	26°C (79°F)	315 mm (12.4 inches)	70%	extreme
June Weather	26°C (79°F)	323 mm (12.7 inches)	81%	extreme
July Weather	26°C (78°F)	252 mm (9.9 inches)	88%	extreme
August Weather	26°C (78°F)	277 mm (10.9 inches)	85%	extreme
September Weather	26°C (79°F)	296 mm (11.7 inches)	84%	extreme
October Weather	25°C (78°F)	353 mm (13.9 inches)	82%	extreme
November Weather	25°C (77°F)	241 mm (9.5 inches)	81%	extreme
December Weather	25°C (76°F)	176 mm (6.9 inches)	74%	very high