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September Weather in Lerma, Mexico

Last updated: August 27, 2025

In Lerma, Mexico, the average temperature in September is a warm 28°C (83°F). Visitors can expect a pleasant range, with minimum temperatures dropping to 23°C (74°F) and maximums soaring up to 36°C (96°F). However, a notable 135 mm (5.3 in) of precipitation may fall over 21 days, contributing to an average humidity of 80%. Be prepared for a mix of sunshine and occasional showers!

September Temperature in Lerma

In September in Lerma, the average temperature is 28°C (83°F). Maximums can reach 36°C (96°F), and minimums can be as low as 23°C (74°F). This makes Lerma a warm and inviting destination for travelers seeking pleasant weather.

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

The chart illustrates September temperature patterns in Lerma, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lerma, September typically has an average temperature of 28°C (83°F), with highs reaching up to 36°C (96°F) and lows dropping to around 23°C (74°F).
JanFebMarAprMayJunJulAugSepOctNovDec757880848583848383817876
Data source: Temperature data for Lerma 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 Lerma

In Lerma in September, the total precipitation amount is 135 mm (5.3 in) over the course of 21 days.

September Precipitation Trends in Lerma

The chart displays monthly precipitation patterns in Lerma, 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 Lerma, September typically receives around 135 mm (5.3 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec18641434205871261351404021
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lerma

In Lerma in September, humidity is 80%. With an average temperature of 28°C (83°F), this humidity feels like a thick blanket enveloping you, making travel feel sluggish and sticky, as every movement generates a sheen of perspiration that clings to your skin.

September Average Humidity in Lerma

This chart illustrates the average monthly humidity levels in Lerma, 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 Lerma is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%73%64%61%60%59%64%76%80%82%83%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lerma

In Lerma in September, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Lerma.

Maximum UV Index Levels in Lerma for September

The chart shows the monthly maximum UV Index (UVI) for Lerma 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 Lerma typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec810131313131313121198
Data source: Lerma 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 Lerma Compares to Other Months

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

This table compares monthly weather conditions in Lerma, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (75°F)18 mm (0.7 inches)78%very high
February Weather26°C (78°F)6 mm (0.2 inches)73%very high
March Weather27°C (81°F)4 mm (0.2 inches)64%extreme
April Weather29°C (84°F)14 mm (0.6 inches)61%extreme
May Weather30°C (85°F)34 mm (1.3 inches)59%extreme
June Weather29°C (84°F)205 mm (8.1 inches)59%extreme
July Weather29°C (84°F)87 mm (3.4 inches)64%extreme
August Weather28°C (84°F)126 mm (5.0 inches)76%extreme
September Weather28°C (83°F)135 mm (5.3 inches)80%extreme
October Weather27°C (82°F)140 mm (5.5 inches)82%extreme
November Weather25°C (78°F)40 mm (1.6 inches)83%very high
December Weather24°C (76°F)21 mm (0.8 inches)84%very high

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