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September Weather in San Diego, Colombia

Last updated: August 23, 2025

In September, the average temperature in San Diego, Colombia is a pleasant 25°C (78°F), with daily highs reaching up to 33°C (92°F) and lows dropping to 20°C (69°F). Precipitation is a notable 488 mm (19.2 in) over 29 days, contributing to the region's lush landscapes. Additionally, the average humidity sits at a high 84%, adding to the tropical feel of this destination.

September Temperature in San Diego

In September, in San Diego, the average temperature is 25°C (78°F). The maximum can reach 33°C (92°F), while the minimum can be as low as 20°C (69°F). This pleasant climate makes San Diego an ideal destination for travelers seeking warmth and outdoor activities during this time of year.

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

The chart illustrates September temperature patterns in San Diego, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Diego, September typically has an average temperature of 25°C (78°F), with highs reaching up to 33°C (92°F) and lows dropping to around 20°C (69°F).
JanFebMarAprMayJunJulAugSepOctNovDec767777777878797978777777
Data source: Temperature data for San Diego 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 San Diego

In San Diego in September, the precipitation amount is 488 mm (19.2 in) spread over 29 days.

September Precipitation Trends in San Diego

The chart displays monthly precipitation patterns in San Diego, 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 Diego, September typically receives around 488 mm (19.2 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec513319542961541728740148853129154
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Diego

In San Diego in September, humidity is 84%. With an average temperature of 25°C (78°F), this humidity feels like a warm, muggy embrace that can be quite stifling for traveling, making you crave cool breezes and plenty of hydration as you explore.

September Average Humidity in San Diego

This chart illustrates the average monthly humidity levels in San Diego, 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 Diego is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec65%65%64%64%65%77%85%85%84%82%79%69%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Diego

In San Diego 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 San Diego.

Maximum UV Index Levels in San Diego for September

The chart shows the monthly maximum UV Index (UVI) for San Diego 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 Diego typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121315151513131413141111
Data source: San Diego 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 Diego Compares to Other Months

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

This table compares monthly weather conditions in San Diego, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)51 mm (2.0 inches)65%extreme
February Weather25°C (77°F)33 mm (1.3 inches)65%extreme
March Weather25°C (77°F)195 mm (7.7 inches)64%extreme
April Weather25°C (78°F)429 mm (16.9 inches)64%extreme
May Weather26°C (78°F)615 mm (24.2 inches)65%extreme
June Weather26°C (79°F)417 mm (16.4 inches)77%extreme
July Weather26°C (79°F)287 mm (11.3 inches)85%extreme
August Weather26°C (79°F)401 mm (15.8 inches)85%extreme
September Weather25°C (78°F)488 mm (19.2 inches)84%extreme
October Weather25°C (77°F)531 mm (20.9 inches)82%extreme
November Weather25°C (77°F)291 mm (11.5 inches)79%extreme
December Weather25°C (77°F)54 mm (2.1 inches)69%extreme

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