nomadseason

September Weather in San Pablo, Costa Rica

Last updated: August 23, 2025

In September, the average temperature in San Pablo, Costa Rica is a comfortable 18°C (65°F), with a minimum of 14°C (57°F) and a pleasant maximum of 25°C (77°F). Expect 508 mm (20.0 in) of precipitation over the month, contributing to an average humidity level of 81%. Prepare for a mix of refreshing showers and mild weather as you explore!

September Temperature in San Pablo

In September in San Pablo, the average temperature is 18°C (65°F). Maximums can reach 25°C (77°F), while minimums can drop to 14°C (57°F). This pleasant weather makes San Pablo an ideal destination for travelers seeking mild temperatures and comfortable outdoor activities.

September Weather in San Pablo: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in San Pablo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Pablo, September typically has an average temperature of 18°C (65°F), with highs reaching up to 25°C (77°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec636464656565656564646463
Data source: Temperature data for San Pablo generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in San Pablo

In San Pablo in September, the precipitation amount is 508 mm (20.0 in) over the course of 30 days.

September Precipitation Trends in San Pablo

The chart displays monthly precipitation patterns in San Pablo, 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 San Pablo, September typically receives around 508 mm (20.0 inches) of precipitation spread over approximately 30 days.
JanFebMarAprMayJunJulAugSepOctNovDec35192815553239931540350860127278
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in San Pablo

In San Pablo in September, humidity is 81%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.

September Average Humidity in San Pablo

This chart illustrates the average monthly humidity levels in San Pablo, 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 San Pablo 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 San Pablo

In San Pablo 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 San Pablo, you can check here.

Maximum UV Index Levels in San Pablo for September

The chart shows the monthly maximum UV Index (UVI) for San Pablo 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 San Pablo typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121415161514151414141211
Data source: San Pablo 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 San Pablo Compares to Other Months

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

This table compares monthly weather conditions in San Pablo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)35 mm (1.4 inches)68%extreme
February Weather18°C (64°F)19 mm (0.8 inches)68%extreme
March Weather18°C (65°F)28 mm (1.1 inches)66%extreme
April Weather18°C (65°F)155 mm (6.1 inches)67%extreme
May Weather18°C (65°F)532 mm (21.0 inches)69%extreme
June Weather18°C (66°F)399 mm (15.7 inches)84%extreme
July Weather18°C (65°F)315 mm (12.4 inches)85%extreme
August Weather18°C (65°F)403 mm (15.9 inches)82%extreme
September Weather18°C (65°F)508 mm (20.0 inches)81%extreme
October Weather18°C (64°F)601 mm (23.7 inches)80%extreme
November Weather18°C (64°F)272 mm (10.7 inches)80%extreme
December Weather17°C (64°F)78 mm (3.1 inches)72%extreme

Compare San Pablo's Climate with Cities Worldwide