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September Weather in Santiago Nacaltepec, Mexico

Last updated: August 27, 2025

In September, the average temperature in Santiago Nacaltepec, Mexico is a pleasant 18°C (65°F). You can expect minimums of 11°C (52°F) and maximums reaching up to 28°C (83°F). Throughout the month, precipitation totals around 268 mm (10.5 in) over 25 days, and the air is quite humid, with an average humidity of 84%.

September Temperature in Santiago Nacaltepec

In September in Santiago Nacaltepec, the average temperature is 18°C (65°F). Maximum temperatures can reach 28°C (83°F), while minimums can drop to as low as 11°C (52°F). It's an ideal time for travelers to enjoy mild weather and pleasant outdoor activities.

September Weather in Santiago Nacaltepec: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Santiago Nacaltepec, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santiago Nacaltepec, September typically has an average temperature of 18°C (65°F), with highs reaching up to 28°C (83°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec596264676966656565646159
Data source: Temperature data for Santiago Nacaltepec 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 Santiago Nacaltepec

In Santiago Nacaltepec in September, the precipitation amount is 268 mm (10.5 in) over a span of 25 days.

September Precipitation Trends in Santiago Nacaltepec

The chart displays monthly precipitation patterns in Santiago Nacaltepec, 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 Santiago Nacaltepec, September typically receives around 268 mm (10.5 inches) of precipitation spread over approximately 25 days.
JanFebMarAprMayJunJulAugSepOctNovDec18111842752481352332681363012
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Santiago Nacaltepec

In Santiago Nacaltepec in September, humidity is 84%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket enveloping you, making travel feel heavy and slightly uncomfortable as the air clings to your skin and limits your breath.

September Average Humidity in Santiago Nacaltepec

This chart illustrates the average monthly humidity levels in Santiago Nacaltepec, 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 Santiago Nacaltepec is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%80%73%67%72%73%76%80%84%89%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Santiago Nacaltepec

In Santiago Nacaltepec in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Santiago Nacaltepec, you can check here.

Maximum UV Index Levels in Santiago Nacaltepec for September

The chart shows the monthly maximum UV Index (UVI) for Santiago Nacaltepec 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 Santiago Nacaltepec typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10131415151515141413119
Data source: Santiago Nacaltepec 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 Santiago Nacaltepec Compares to Other Months

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

This table compares monthly weather conditions in Santiago Nacaltepec, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather15°C (59°F)18 mm (0.7 inches)84%very high
February Weather17°C (62°F)11 mm (0.4 inches)80%extreme
March Weather18°C (65°F)18 mm (0.7 inches)73%extreme
April Weather20°C (68°F)42 mm (1.7 inches)67%extreme
May Weather20°C (69°F)75 mm (3.0 inches)72%extreme
June Weather19°C (66°F)248 mm (9.8 inches)73%extreme
July Weather18°C (65°F)135 mm (5.3 inches)76%extreme
August Weather18°C (65°F)233 mm (9.2 inches)80%extreme
September Weather18°C (65°F)268 mm (10.5 inches)84%extreme
October Weather18°C (64°F)136 mm (5.3 inches)89%extreme
November Weather16°C (61°F)30 mm (1.2 inches)88%extreme
December Weather15°C (59°F)12 mm (0.5 inches)88%very high

Compare Santiago Nacaltepec's Climate with Cities Worldwide