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September Weather in San Mateo, Colombia

Last updated: August 23, 2025

In September, the average temperature in San Mateo, Colombia is a crisp 11°C (52°F). Expect lows of 2°C (36°F) and highs reaching 19°C (66°F). This month also brings 155 mm (6.1 in) of precipitation spread over 27 days, resulting in an average humidity of 78%. Prepare for a refreshing mix of cool weather and occasional rain!

September Temperature in San Mateo

In September in San Mateo, the average temperature is 11°C (52°F). Maximums can reach 19°C (66°F), while minimums can dip as low as 2°C (36°F). It's advisable to pack layers to stay comfortable during your travels.

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

The chart illustrates September temperature patterns in San Mateo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Mateo, September typically has an average temperature of 11°C (52°F), with highs reaching up to 19°C (66°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec515252535352525252525252
Data source: Temperature data for San Mateo 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 Mateo

In San Mateo in September, the precipitation amount is 155 mm (6.1 in) spread over 27 days.

September Precipitation Trends in San Mateo

The chart displays monthly precipitation patterns in San Mateo, 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 Mateo, September typically receives around 155 mm (6.1 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec8411525023323321118614415618016477
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Mateo

In San Mateo in September humidity is 78%. With an average temperature of 11°C (52°F), this humidity feels like a damp blanket wrapping around you, making outdoor activities somewhat uncomfortable and travel more challenging as you navigate the moist air.

September Average Humidity in San Mateo

This chart illustrates the average monthly humidity levels in San Mateo, 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 Mateo is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec52%47%45%54%81%88%88%82%78%83%84%70%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Mateo

In San Mateo in September, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in San Mateo.

Maximum UV Index Levels in San Mateo for September

The chart shows the monthly maximum UV Index (UVI) for San Mateo 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 Mateo typically reaches 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151718191716161616151413
Data source: San Mateo 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 Mateo Compares to Other Months

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

This table compares monthly weather conditions in San Mateo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)84 mm (3.3 inches)52%extreme
February Weather11°C (52°F)115 mm (4.5 inches)47%extreme
March Weather11°C (52°F)250 mm (9.8 inches)45%extreme
April Weather11°C (53°F)233 mm (9.2 inches)54%extreme
May Weather12°C (53°F)233 mm (9.2 inches)81%extreme
June Weather11°C (52°F)211 mm (8.3 inches)88%extreme
July Weather11°C (52°F)186 mm (7.3 inches)88%extreme
August Weather11°C (52°F)144 mm (5.7 inches)82%extreme
September Weather11°C (52°F)155 mm (6.1 inches)78%extreme
October Weather11°C (52°F)180 mm (7.1 inches)83%extreme
November Weather11°C (52°F)164 mm (6.5 inches)83%extreme
December Weather11°C (52°F)77 mm (3.0 inches)70%extreme

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