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September Weather in San Sebastian, Colombia

Last updated: August 23, 2025

In September, the average temperature in San Sebastian, Colombia hovers around 14°C (57°F), with daytime highs reaching up to 23°C (73°F) and dipping to a refreshing 7°C (45°F) at night. Expect some moisture in the air, as 62 mm (2.5 in) of precipitation is likely to fall over 14 days, accompanied by an average humidity level of 53%.

September Temperature in San Sebastian

In September in San Sebastian, the average temperature is 14°C (57°F). Maximum temperatures can reach 23°C (73°F), while minimums can drop to as low as 7°C (45°F). This pleasant climate makes San Sebastian an ideal destination for travelers seeking a comfortable and enjoyable experience.

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

The chart illustrates September temperature patterns in San Sebastian, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Sebastian, September typically has an average temperature of 14°C (57°F), with highs reaching up to 23°C (73°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec575857575757555657575857
Data source: Temperature data for San Sebastian 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 Sebastian

In San Sebastian in September, the precipitation amount is 62 mm (2.5 in) over the course of 14 days.

September Precipitation Trends in San Sebastian

The chart displays monthly precipitation patterns in San Sebastian, 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 Sebastian, September typically receives around 62 mm (2.5 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec150177211174174126896863126211156
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Sebastian

In San Sebastian in September, humidity is 53%. With an average temperature of 14°C (57°F), this humidity feels like a comfortable balance, making it pleasant for traveling as the mild air envelops you, allowing for enjoyable exploration without feeling too sticky or cold.

September Average Humidity in San Sebastian

This chart illustrates the average monthly humidity levels in San Sebastian, 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 Sebastian is approximately 53%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%66%74%83%93%93%84%61%53%67%78%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Sebastian

In San Sebastian in September, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in San Sebastian.

Maximum UV Index Levels in San Sebastian for September

The chart shows the monthly maximum UV Index (UVI) for San Sebastian 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 Sebastian typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec161718181614151515161513
Data source: San Sebastian 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 Sebastian Compares to Other Months

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

This table compares monthly weather conditions in San Sebastian, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather14°C (57°F)150 mm (5.9 inches)72%extreme
February Weather14°C (58°F)176 mm (6.9 inches)66%extreme
March Weather14°C (58°F)211 mm (8.3 inches)74%extreme
April Weather14°C (58°F)174 mm (6.9 inches)83%extreme
May Weather14°C (58°F)174 mm (6.9 inches)93%extreme
June Weather14°C (57°F)126 mm (4.9 inches)93%extreme
July Weather13°C (56°F)89 mm (3.5 inches)84%extreme
August Weather13°C (56°F)68 mm (2.7 inches)61%extreme
September Weather14°C (57°F)62 mm (2.5 inches)53%extreme
October Weather14°C (58°F)126 mm (5.0 inches)67%extreme
November Weather14°C (58°F)211 mm (8.3 inches)78%extreme
December Weather14°C (58°F)156 mm (6.2 inches)85%extreme

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