September Weather in Guapiles, Costa Rica

Last updated: August 23, 2025

In September, the average temperature in Guapiles, Costa Rica is a comfortable 24°C (76°F), with a minimum of 19°C (66°F) and soaring up to a maximum of 31°C (89°F). However, be prepared for 192 mm (7.6 in) of precipitation spread over 27 days, contributing to an average humidity level of 84%.

September Temperature in Guapiles

In September in Guapiles, the average temperature is 24°C (76°F). Maximum temperatures can reach 31°C (89°F), while the minimum can drop to as low as 19°C (66°F). This makes Guapiles an ideal destination for travelers seeking warm and pleasant weather during this time of the year.

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

The chart illustrates September temperature patterns in Guapiles, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Guapiles, September typically has an average temperature of 24°C (76°F), with highs reaching up to 31°C (89°F) and lows dropping to around 19°C (66°F).

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

September Precipitation in Guapiles

In Guapiles in September, the precipitation amount is 192 mm (7.6 in) during 27 days, indicating a frequent occurrence of rain throughout the month.

September Precipitation Trends in Guapiles

The chart displays monthly precipitation patterns in Guapiles, 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 Guapiles, September typically receives around 192 mm (7.6 inches) of precipitation spread over approximately 27 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 Guapiles

In Guapiles in September humidity is 84%. With an average temperature of 24°C (76°F), this humidity feels like a warm, damp embrace that can make outdoor activities feel sticky and uncomfortable, requiring frequent breaks in the shade and plenty of hydration for travelers.

September Average Humidity in Guapiles

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

In Guapiles 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 Guapiles.

Maximum UV Index Levels in Guapiles for September

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

Data source: Guapiles 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 Guapiles Compares to Other Months

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

This table compares monthly weather conditions in Guapiles, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	22°C (72°F)	203 mm (8.0 inches)	71%	extreme
February Weather	22°C (72°F)	86 mm (3.4 inches)	70%	extreme
March Weather	23°C (73°F)	93 mm (3.7 inches)	68%	extreme
April Weather	24°C (75°F)	120 mm (4.7 inches)	69%	extreme
May Weather	24°C (76°F)	356 mm (14.0 inches)	70%	extreme
June Weather	24°C (76°F)	269 mm (10.6 inches)	81%	extreme
July Weather	24°C (75°F)	286 mm (11.3 inches)	88%	extreme
August Weather	24°C (76°F)	203 mm (8.0 inches)	85%	extreme
September Weather	24°C (76°F)	192 mm (7.6 inches)	84%	extreme
October Weather	24°C (75°F)	405 mm (15.9 inches)	82%	extreme
November Weather	23°C (74°F)	334 mm (13.1 inches)	81%	extreme
December Weather	23°C (73°F)	320 mm (12.6 inches)	74%	very high