nomadseason

September Weather in San Jose, Panama

Last updated: August 27, 2025

In San Jose, Panama, the average temperature in September is a comfortable 24°C (75°F). Expect a minimum of 20°C (67°F) and a maximum of 30°C (87°F) throughout the month. However, be prepared for significant precipitation, with an average of 401 mm (15.8 in) over 30 days, and keep hydrated as the average humidity hovers around 87%.

September Temperature in San Jose

In September in San Jose, the average temperature is 24°C (75°F). Maximums can reach 30°C (87°F), while minimums can drop to as low as 20°C (67°F). This pleasant climate makes San Jose an inviting destination for travelers seeking warmth and comfort.

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

The chart illustrates September temperature patterns in San Jose, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Jose, September typically has an average temperature of 24°C (75°F), with highs reaching up to 30°C (87°F) and lows dropping to around 20°C (67°F).
JanFebMarAprMayJunJulAugSepOctNovDec737374757575757575747474
Data source: Temperature data for San Jose 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 Jose

In San Jose in September, the total precipitation amount is 401 mm (15.8 in) over the course of 30 days.

September Precipitation Trends in San Jose

The chart displays monthly precipitation patterns in San Jose, 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 Jose, September typically receives around 401 mm (15.8 inches) of precipitation spread over approximately 30 days.
JanFebMarAprMayJunJulAugSepOctNovDec1027981158374326326319401413344160
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in San Jose

In San Jose in September, humidity is 87%. With an average temperature of 24°C (75°F), this humidity feels like a warm, sticky embrace that clings to your skin, making outdoor activities feel heavier and more exhausting, and the air thickens, leaving you longing for shade and refreshing breezes as you navigate your adventures.

September Average Humidity in San Jose

This chart illustrates the average monthly humidity levels in San Jose, 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 Jose is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%71%69%70%73%90%89%87%87%86%86%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Jose

In San Jose 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 Jose, you can check here.

Maximum UV Index Levels in San Jose for September

The chart shows the monthly maximum UV Index (UVI) for San Jose 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 Jose typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121314151513131314141210
Data source: San Jose 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 Jose Compares to Other Months

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

This table compares monthly weather conditions in San Jose, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (74°F)102 mm (4.0 inches)72%extreme
February Weather23°C (74°F)79 mm (3.1 inches)71%extreme
March Weather23°C (74°F)81 mm (3.2 inches)69%extreme
April Weather24°C (76°F)158 mm (6.2 inches)70%extreme
May Weather24°C (76°F)374 mm (14.7 inches)73%extreme
June Weather24°C (76°F)326 mm (12.8 inches)90%extreme
July Weather24°C (75°F)326 mm (12.8 inches)88%extreme
August Weather24°C (75°F)319 mm (12.6 inches)87%extreme
September Weather24°C (75°F)401 mm (15.8 inches)87%extreme
October Weather24°C (75°F)413 mm (16.2 inches)86%extreme
November Weather23°C (74°F)344 mm (13.5 inches)86%extreme
December Weather23°C (74°F)160 mm (6.3 inches)79%very high

Compare San Jose's Climate with Cities Worldwide