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September Weather in La Suiza, Costa Rica

Last updated: August 23, 2025

In September, the average temperature in La Suiza, Costa Rica hovers around 18°C (65°F), with a comfortable range between a minimum of 13°C (56°F) and a maximum of 25°C (78°F). Expect some rain, as precipitation typically amounts to 284 mm (11.2 in) spread over 29 days, contributing to an average humidity level of 81%.

September Temperature in La Suiza

In September in La Suiza, the average temperature is 18°C (65°F). Maximums can reach 25°C (78°F), while minimums can drop to as low as 13°C (56°F). This pleasant climate makes it an ideal time for travelers to explore the beauty of La Suiza.

September Weather in La Suiza: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in La Suiza, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In La Suiza, September typically has an average temperature of 18°C (65°F), with highs reaching up to 25°C (78°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec606061636565646465646361
Data source: Temperature data for La Suiza generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in La Suiza

In La Suiza in September, the total precipitation amounts to 284 mm (11.2 in) spread over 29 days.

September Precipitation Trends in La Suiza

The chart displays monthly precipitation patterns in La Suiza, 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 La Suiza, September typically receives around 284 mm (11.2 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec1448694153435287282292284422291218
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in La Suiza

In La Suiza in September, humidity is 81%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.

September Average Humidity in La Suiza

This chart illustrates the average monthly humidity levels in La Suiza, 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 La Suiza is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec68%68%66%67%69%84%85%82%81%80%80%73%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in La Suiza

In La Suiza 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 La Suiza, you can check here.

Maximum UV Index Levels in La Suiza for September

The chart shows the monthly maximum UV Index (UVI) for La Suiza 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 La Suiza typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec131416161515151414151211
Data source: La Suiza 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 La Suiza Compares to Other Months

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

This table compares monthly weather conditions in La Suiza, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather16°C (60°F)144 mm (5.7 inches)68%extreme
February Weather16°C (61°F)86 mm (3.4 inches)68%extreme
March Weather16°C (61°F)94 mm (3.7 inches)66%extreme
April Weather17°C (64°F)153 mm (6.0 inches)67%extreme
May Weather18°C (65°F)435 mm (17.1 inches)69%extreme
June Weather18°C (65°F)287 mm (11.3 inches)84%extreme
July Weather18°C (65°F)282 mm (11.1 inches)85%extreme
August Weather18°C (65°F)292 mm (11.5 inches)82%extreme
September Weather18°C (65°F)284 mm (11.2 inches)81%extreme
October Weather18°C (65°F)422 mm (16.6 inches)80%extreme
November Weather17°C (64°F)291 mm (11.4 inches)80%extreme
December Weather16°C (62°F)218 mm (8.6 inches)72%extreme

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