September Weather in Naranjo, Costa Rica

Last updated: August 23, 2025

In September, the average temperature in Naranjo, Costa Rica is a comfortable 23°C (74°F). Expect minimums around 18°C (66°F) and maximums reaching 29°C (85°F). With an average humidity of 81%, you’ll feel the warmth throughout the day. Be prepared for precipitation, as 461 mm (18.2 in) may fall over 29 days.

September Temperature in Naranjo

In September in Naranjo, the average temperature is 23°C (74°F). The maximum can reach 29°C (85°F), while the minimum can be as low as 18°C (66°F). This pleasant weather makes Naranjo an ideal destination for travelers seeking mild and enjoyable conditions.

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

The chart illustrates September temperature patterns in Naranjo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Naranjo, September typically has an average temperature of 23°C (74°F), with highs reaching up to 29°C (85°F) and lows dropping to around 18°C (66°F).

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

September Precipitation in Naranjo

In Naranjo in September, the total precipitation amount is 461 mm (18.2 in) spread over 29 days.

September Precipitation Trends in Naranjo

The chart displays monthly precipitation patterns in Naranjo, 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 Naranjo, September typically receives around 461 mm (18.2 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 Naranjo

In Naranjo in September, humidity is 81%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket draped over your skin, making travel feel a bit more sluggish and requiring plenty of water breaks to stay comfortable.

September Average Humidity in Naranjo

This chart illustrates the average monthly humidity levels in Naranjo, 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 Naranjo is approximately 81%, 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 Naranjo

In Naranjo 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 Naranjo.

Maximum UV Index Levels in Naranjo for September

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

Data source: Naranjo 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 Naranjo Compares to Other Months

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

This table compares monthly weather conditions in Naranjo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	23°C (74°F)	28 mm (1.1 inches)	68%	extreme
February Weather	24°C (76°F)	13 mm (0.5 inches)	68%	extreme
March Weather	25°C (77°F)	18 mm (0.7 inches)	66%	extreme
April Weather	24°C (76°F)	118 mm (4.6 inches)	67%	extreme
May Weather	24°C (75°F)	412 mm (16.2 inches)	69%	extreme
June Weather	24°C (75°F)	397 mm (15.6 inches)	84%	extreme
July Weather	24°C (75°F)	296 mm (11.7 inches)	85%	extreme
August Weather	23°C (74°F)	393 mm (15.5 inches)	82%	extreme
September Weather	23°C (74°F)	461 mm (18.2 inches)	81%	extreme
October Weather	23°C (73°F)	639 mm (25.2 inches)	80%	extreme
November Weather	23°C (74°F)	251 mm (9.9 inches)	80%	extreme
December Weather	23°C (74°F)	72 mm (2.8 inches)	72%	very high