September Weather in Cot, Costa Rica

Last updated: August 23, 2025

In September, the average temperature in Cot, Costa Rica hovers around 19°C (67°F), making it a pleasant time to visit. Expect minimum temperatures of 15°C (59°F) and highs reaching 26°C (79°F). However, be prepared for the possibility of rainfall, as the area receives an average of 284 mm (11.2 in) over 29 days. With an average humidity of 81%, it's advisable to pack accordingly for both warmth and moisture!

September Temperature in Cot

In September in Cot, the average temperature is 19°C (67°F). Maximums can reach 26°C (79°F) and minimums can be as low as 15°C (59°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities in Cot.

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

The chart illustrates September temperature patterns in Cot, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cot, September typically has an average temperature of 19°C (67°F), with highs reaching up to 26°C (79°F) and lows dropping to around 15°C (59°F).

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

September Precipitation in Cot

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

September Precipitation Trends in Cot

The chart displays monthly precipitation patterns in Cot, 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 Cot, September typically receives around 284 mm (11.2 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 Cot

In Cot in September humidity is 81%. With an average temperature of 19°C (67°F), this humidity feels like a heavy blanket enveloping you, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick, prompting you to seek shade and hydration frequently.

September Average Humidity in Cot

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

In Cot 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 Cot, you can check here.

Maximum UV Index Levels in Cot for September

The chart shows the monthly maximum UV Index (UVI) for Cot 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 Cot typically reaches 14, which falls under the extreme exposure category.

Data source: Cot 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 Cot Compares to Other Months

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

This table compares monthly weather conditions in Cot, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	17°C (63°F)	194 mm (7.6 inches)	68%	extreme
February Weather	17°C (63°F)	105 mm (4.1 inches)	68%	extreme
March Weather	17°C (63°F)	117 mm (4.6 inches)	66%	extreme
April Weather	19°C (66°F)	167 mm (6.6 inches)	67%	extreme
May Weather	20°C (67°F)	468 mm (18.4 inches)	69%	extreme
June Weather	20°C (68°F)	292 mm (11.5 inches)	84%	extreme
July Weather	19°C (67°F)	254 mm (10.0 inches)	85%	extreme
August Weather	19°C (67°F)	243 mm (9.5 inches)	82%	extreme
September Weather	19°C (67°F)	284 mm (11.2 inches)	81%	extreme
October Weather	19°C (67°F)	479 mm (18.9 inches)	80%	extreme
November Weather	19°C (66°F)	341 mm (13.4 inches)	80%	extreme
December Weather	18°C (64°F)	290 mm (11.4 inches)	72%	very high