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September Weather in San Marcos, Colombia

Last updated: August 23, 2025

In September, the average temperature in San Marcos, Colombia is a warm 28°C (82°F). Expect a comfortable minimum of 23°C (74°F) and the occasional peak at a steamy 35°C (95°F). It's important to note that this month sees an average precipitation of 209 mm (8.2 in) spread over 27 days, coupled with a high average humidity of 87%. Packed with warmth and moisture, be prepared for an enchanting yet wet experience!

September Temperature in San Marcos

In September, in San Marcos, the average temperature is 28°C (82°F). Maximums can reach 35°C (95°F), and minimums can be as low as 23°C (74°F). This makes San Marcos a warm and pleasant destination for travelers looking to enjoy a sunny getaway.

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

The chart illustrates September temperature patterns in San Marcos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Marcos, September typically has an average temperature of 28°C (82°F), with highs reaching up to 35°C (95°F) and lows dropping to around 23°C (74°F).
JanFebMarAprMayJunJulAugSepOctNovDec838686848383838282818283
Data source: Temperature data for San Marcos 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 Marcos

In San Marcos in September, the precipitation amount is 209 mm (8.2 in) spread over 27 days.

September Precipitation Trends in San Marcos

The chart displays monthly precipitation patterns in San Marcos, 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 Marcos, September typically receives around 209 mm (8.2 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec2764815025922919820920921418664
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Marcos

In San Marcos in September humidity is 87%. With an average temperature of 28°C (82°F), this humidity feels like a warm, thick blanket wrapping around you, making travel challenging as you navigate the air's heavy moisture.

September Average Humidity in San Marcos

This chart illustrates the average monthly humidity levels in San Marcos, 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 Marcos is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%67%65%67%79%87%88%87%87%86%86%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Marcos

In San Marcos 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 Marcos.

Maximum UV Index Levels in San Marcos for September

The chart shows the monthly maximum UV Index (UVI) for San Marcos 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 Marcos typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec111214151413131313131110
Data source: San Marcos 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 Marcos Compares to Other Months

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

This table compares monthly weather conditions in San Marcos, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather29°C (84°F)27 mm (1.1 inches)70%extreme
February Weather30°C (87°F)6 mm (0.2 inches)67%extreme
March Weather30°C (86°F)48 mm (1.9 inches)65%extreme
April Weather29°C (84°F)150 mm (5.9 inches)67%extreme
May Weather28°C (83°F)259 mm (10.2 inches)79%extreme
June Weather28°C (83°F)229 mm (9.0 inches)87%extreme
July Weather28°C (83°F)198 mm (7.8 inches)88%extreme
August Weather28°C (83°F)209 mm (8.2 inches)87%extreme
September Weather28°C (82°F)209 mm (8.2 inches)87%extreme
October Weather27°C (82°F)214 mm (8.4 inches)86%extreme
November Weather28°C (82°F)186 mm (7.3 inches)86%extreme
December Weather28°C (83°F)64 mm (2.5 inches)80%very high

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