September Weather in Upala, Costa Rica

Last updated: August 23, 2025

In September, the average temperature in Upala, Costa Rica is a warm 26°C (79°F), with a minimum dipping to 23°C (74°F) and a maximum soaring to 30°C (87°F). Rainfall is frequent, with 263 mm (10.4 in) of precipitation spread over 29 days, contributing to an average humidity of 80%.

September Temperature in Upala

In September in Upala, the average temperature is 26°C (79°F). Maximums can reach 30°C (87°F) and minimums can be as low as 23°C (74°F). This pleasant climate makes Upala an ideal destination for travelers seeking warm weather and outdoor activities.

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

The chart illustrates September temperature patterns in Upala, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Upala, September typically has an average temperature of 26°C (79°F), with highs reaching up to 30°C (87°F) and lows dropping to around 23°C (74°F).

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

September Precipitation in Upala

In Upala in September, the precipitation amount is 263 mm (10.4 in) over the course of 29 days.

September Precipitation Trends in Upala

The chart displays monthly precipitation patterns in Upala, 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 Upala, September typically receives around 263 mm (10.4 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 Upala

In Upala in September humidity is 80%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket, making outdoor activities feel sticky and exhausting, potentially dampening the travel experience and necessitating frequent breaks to cool down and hydrate.

September Average Humidity in Upala

This chart illustrates the average monthly humidity levels in Upala, 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 Upala is approximately 80%, 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 Upala

In Upala 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 Upala.

Maximum UV Index Levels in Upala for September

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

Data source: Upala 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 Upala Compares to Other Months

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

This table compares monthly weather conditions in Upala, 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)	191 mm (7.5 inches)	66%	extreme
February Weather	25°C (76°F)	117 mm (4.6 inches)	64%	extreme
March Weather	25°C (77°F)	132 mm (5.2 inches)	63%	extreme
April Weather	26°C (79°F)	85 mm (3.4 inches)	63%	extreme
May Weather	26°C (79°F)	277 mm (10.9 inches)	63%	extreme
June Weather	26°C (79°F)	326 mm (12.8 inches)	74%	extreme
July Weather	25°C (78°F)	331 mm (13.0 inches)	85%	extreme
August Weather	26°C (78°F)	301 mm (11.8 inches)	82%	extreme
September Weather	26°C (79°F)	263 mm (10.4 inches)	80%	extreme
October Weather	26°C (78°F)	356 mm (14.0 inches)	79%	extreme
November Weather	25°C (78°F)	339 mm (13.3 inches)	79%	extreme
December Weather	25°C (76°F)	276 mm (10.9 inches)	70%	very high