September Weather in Juntas, Costa Rica

Last updated: August 23, 2025

In Juntas, Costa Rica, the average temperature in September hovers around 25°C (77°F). Expect a minimum of 21°C (70°F) and a maximum of 32°C (90°F). With precipitation reaching 340 mm (13.4 in) over 28 days, the month tends to be quite wet, accompanied by an average humidity of 80%. Prepare for a warm and humid experience during your visit!

September Temperature in Juntas

In September in Juntas, the average temperature is 25°C (77°F). The maximum can reach 32°C (90°F), and the minimum can be as low as 21°C (70°F). It's a great time to explore and enjoy outdoor activities, as the weather is warm and pleasant.

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

The chart illustrates September temperature patterns in Juntas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Juntas, September typically has an average temperature of 25°C (77°F), with highs reaching up to 32°C (90°F) and lows dropping to around 21°C (70°F).

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

September Precipitation in Juntas

In Juntas in September, the total precipitation amount is 340 mm (13.4 in) spread over a period of 28 days.

September Precipitation Trends in Juntas

The chart displays monthly precipitation patterns in Juntas, 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 Juntas, September typically receives around 340 mm (13.4 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 Juntas

In Juntas in September humidity is 80%. With an average temperature of 25°C (77°F), this humidity feels like traveling through a warm, tropical rainforest where the air is thick and steamy, making even the simplest stroll feel like a workout.

September Average Humidity in Juntas

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

In Juntas 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 Juntas.

Maximum UV Index Levels in Juntas for September

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

Data source: Juntas 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 Juntas Compares to Other Months

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

This table compares monthly weather conditions in Juntas, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	25°C (78°F)	9 mm (0.4 inches)	66%	extreme
February Weather	26°C (79°F)	2 mm (0.1 inches)	64%	extreme
March Weather	26°C (80°F)	1 mm (0.0 inches)	63%	extreme
April Weather	27°C (81°F)	60 mm (2.4 inches)	63%	extreme
May Weather	26°C (79°F)	298 mm (11.7 inches)	63%	extreme
June Weather	25°C (78°F)	314 mm (12.4 inches)	74%	extreme
July Weather	25°C (78°F)	170 mm (6.7 inches)	85%	extreme
August Weather	25°C (78°F)	278 mm (11.0 inches)	82%	extreme
September Weather	25°C (77°F)	340 mm (13.4 inches)	80%	extreme
October Weather	25°C (76°F)	495 mm (19.5 inches)	79%	extreme
November Weather	25°C (77°F)	143 mm (5.6 inches)	79%	extreme
December Weather	25°C (77°F)	27 mm (1.1 inches)	70%	very high