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September Weather in Monterrey, Colombia

Last updated: August 23, 2025

In September, the average temperature in Monterrey, Colombia is a pleasant 21°C (71°F), with lows dipping to 14°C (58°F) and highs reaching up to 28°C (83°F). Be prepared for some rain, as the area experiences about 105 mm (4.1 in) of precipitation over 20 days, contributing to an average humidity of 64%.

September Temperature in Monterrey

In September in Monterrey, the average temperature is 21°C (71°F), with maximums reaching 28°C (83°F) and minimums dropping to as low as 14°C (58°F). This makes it an ideal time for travelers seeking pleasant weather and opportunities for outdoor activities.

September Weather in Monterrey: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Monterrey, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Monterrey, September typically has an average temperature of 21°C (71°F), with highs reaching up to 28°C (83°F) and lows dropping to around 14°C (58°F).
JanFebMarAprMayJunJulAugSepOctNovDec727373727170696970717172
Data source: Temperature data for Monterrey 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 Monterrey

In Monterrey in September, the precipitation amount is 105 mm (4.1 in) over the course of 20 days.

September Precipitation Trends in Monterrey

The chart displays monthly precipitation patterns in Monterrey, 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 Monterrey, September typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec647212824029526020113110516519972
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Monterrey

In Monterrey in September, humidity is 64%. With an average temperature of 21°C (71°F), this humidity feels like a warm embrace, making it comfortable for traveling but with a slight stickiness in the air that calls for light, breathable clothing and plenty of hydration.

September Average Humidity in Monterrey

This chart illustrates the average monthly humidity levels in Monterrey, 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 Monterrey is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec51%46%50%64%85%92%89%73%64%68%73%66%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Monterrey

In Monterrey 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 Monterrey.

Maximum UV Index Levels in Monterrey for September

The chart shows the monthly maximum UV Index (UVI) for Monterrey 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 Monterrey typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141517171615151515151313
Data source: Monterrey 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 Monterrey Compares to Other Months

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

This table compares monthly weather conditions in Monterrey, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather22°C (72°F)64 mm (2.5 inches)51%extreme
February Weather23°C (73°F)72 mm (2.8 inches)46%extreme
March Weather23°C (73°F)128 mm (5.0 inches)49%extreme
April Weather22°C (72°F)240 mm (9.4 inches)63%extreme
May Weather21°C (71°F)295 mm (11.6 inches)85%extreme
June Weather21°C (70°F)260 mm (10.2 inches)92%extreme
July Weather21°C (69°F)201 mm (7.9 inches)89%extreme
August Weather21°C (70°F)131 mm (5.1 inches)73%extreme
September Weather21°C (71°F)105 mm (4.1 inches)64%extreme
October Weather22°C (71°F)165 mm (6.5 inches)67%extreme
November Weather22°C (72°F)199 mm (7.8 inches)73%extreme
December Weather22°C (72°F)72 mm (2.8 inches)66%extreme

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