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September Weather in Santo Domingo, Costa Rica

Last updated: August 23, 2025

In September, the average temperature in Santo Domingo, Costa Rica hovers around 20°C (69°F), with a comfortable range between 15°C (60°F) and 27°C (80°F). Expect moderate rainfall during this period, with a total precipitation of 436 mm (17.2 in) spread over 28 days. Moreover, the average humidity sits at a lush 81%, creating a uniquely vibrant atmosphere.

September Temperature in Santo Domingo

In September in Santo Domingo, the average temperature is 20°C (69°F). Maximums can reach 27°C (80°F), while minimums can dip as low as 15°C (60°F). This pleasant climate makes it an ideal time for outdoor adventures and exploring all that Santo Domingo has to offer.

September Weather in Santo Domingo: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Santo Domingo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santo Domingo, September typically has an average temperature of 20°C (69°F), with highs reaching up to 27°C (80°F) and lows dropping to around 15°C (60°F).
JanFebMarAprMayJunJulAugSepOctNovDec686969706969696968686868
Data source: Temperature data for Santo Domingo generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Santo Domingo

In Santo Domingo in September, the precipitation amount is 436 mm (17.2 in) over the course of 28 days.

September Precipitation Trends in Santo Domingo

The chart displays monthly precipitation patterns in Santo Domingo, 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 Santo Domingo, September typically receives around 436 mm (17.2 inches) of precipitation spread over approximately 28 days.
JanFebMarAprMayJunJulAugSepOctNovDec3213157939135123333143657020963
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Santo Domingo

In Santo Domingo in September, humidity is 81%. With an average temperature of 20°C (69°F), this humidity feels like a thick blanket embracing you, making travel a bit uncomfortable and sticky.

September Average Humidity in Santo Domingo

This chart illustrates the average monthly humidity levels in Santo Domingo, 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 Santo Domingo is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec68%68%66%67%69%84%85%82%81%80%80%73%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Santo Domingo

In Santo Domingo 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 Santo Domingo.

Maximum UV Index Levels in Santo Domingo for September

The chart shows the monthly maximum UV Index (UVI) for Santo Domingo 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 Santo Domingo typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121315151414141313141210
Data source: Santo Domingo 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 Santo Domingo Compares to Other Months

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

This table compares monthly weather conditions in Santo Domingo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather20°C (68°F)32 mm (1.3 inches)68%extreme
February Weather20°C (69°F)13 mm (0.5 inches)68%extreme
March Weather21°C (70°F)15 mm (0.6 inches)66%extreme
April Weather21°C (70°F)79 mm (3.1 inches)67%extreme
May Weather21°C (70°F)391 mm (15.4 inches)69%extreme
June Weather21°C (70°F)351 mm (13.8 inches)84%extreme
July Weather21°C (69°F)233 mm (9.2 inches)85%extreme
August Weather20°C (69°F)331 mm (13.0 inches)82%extreme
September Weather20°C (69°F)436 mm (17.2 inches)81%extreme
October Weather20°C (68°F)570 mm (22.4 inches)80%extreme
November Weather20°C (68°F)209 mm (8.2 inches)80%extreme
December Weather20°C (68°F)63 mm (2.5 inches)72%very high

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