September Weather in Sardinal, Costa Rica

Last updated: August 23, 2025

In Sardinal, Costa Rica, the average temperature in September reaches a warm 27°C (80°F), with minimums dipping to 24°C (76°F) and maximums soaring up to 31°C (88°F). Be prepared for the high humidity, averaging around 80%, which can make the warmth feel even more intense. Additionally, expect precipitation of about 218 mm (8.6 in) spread over 27 days, so a light raincoat might come in handy!

September Temperature in Sardinal

In September in Sardinal, the average temperature is 27°C (80°F). Maximums can reach 31°C (88°F), while minimums can drop to as low as 24°C (76°F). This pleasant climate makes Sardinal an ideal destination for travelers looking to enjoy warm and comfortable weather.

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

The chart illustrates September temperature patterns in Sardinal, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sardinal, September typically has an average temperature of 27°C (80°F), with highs reaching up to 31°C (88°F) and lows dropping to around 24°C (76°F).

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

September Precipitation in Sardinal

In Sardinal in September, the total precipitation amount is 218 mm (8.6 in) spread over 27 days.

September Precipitation Trends in Sardinal

The chart displays monthly precipitation patterns in Sardinal, 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 Sardinal, September typically receives around 218 mm (8.6 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 Sardinal

In Sardinal in September humidity is 80%. With an average temperature of 27°C (80°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities feel more exhausting and sticky, and challenging you to stay hydrated while exploring.

September Average Humidity in Sardinal

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

In Sardinal 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 Sardinal.

Maximum UV Index Levels in Sardinal for September

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

Data source: Sardinal 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 Sardinal Compares to Other Months

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

This table compares monthly weather conditions in Sardinal, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (80°F)	5 mm (0.2 inches)	66%	extreme
February Weather	27°C (81°F)	1 mm (0.0 inches)	64%	extreme
March Weather	27°C (82°F)	1 mm (0.0 inches)	63%	extreme
April Weather	28°C (83°F)	24 mm (1.0 inches)	63%	extreme
May Weather	27°C (82°F)	233 mm (9.2 inches)	63%	extreme
June Weather	27°C (81°F)	224 mm (8.8 inches)	74%	extreme
July Weather	27°C (82°F)	99 mm (3.9 inches)	85%	extreme
August Weather	27°C (81°F)	207 mm (8.1 inches)	82%	extreme
September Weather	27°C (80°F)	218 mm (8.6 inches)	80%	extreme
October Weather	26°C (80°F)	357 mm (14.1 inches)	79%	extreme
November Weather	27°C (80°F)	132 mm (5.2 inches)	79%	extreme
December Weather	27°C (80°F)	13 mm (0.5 inches)	70%	very high