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September Weather in Santo Tomas, Mexico

Last updated: August 27, 2025

In Santo Tomas, Mexico, the average temperature in September hovers around 15°C (60°F), with lows dipping to 5°C (41°F) and highs reaching up to 24°C (76°F). Expect 173 mm (6.8 in) of rain over 21 days, contributing to an average humidity level of 82%. Whether you're planning outdoor activities or cozy indoor escapes, be prepared for the humid conditions!

September Temperature in Santo Tomas

In September in Santo Tomas, the average temperature is 15°C (60°F). The maximum can reach 24°C (76°F), and the minimum can be as low as 5°C (41°F). It's a great time to visit if you enjoy mild weather and comfortable temperatures for outdoor activities.

September Weather in Santo Tomas: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Santo Tomas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santo Tomas, September typically has an average temperature of 15°C (60°F), with highs reaching up to 24°C (76°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec525558616361606059575452
Data source: Temperature data for Santo Tomas 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 Santo Tomas

In Santo Tomas in September, the precipitation amount is 173 mm (6.8 in) over the course of 21 days.

September Precipitation Trends in Santo Tomas

The chart displays monthly precipitation patterns in Santo Tomas, 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 Santo Tomas, September typically receives around 173 mm (6.8 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec1412244257155126162173105297
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Santo Tomas

In Santo Tomas in September humidity is 82%. With an average temperature of 15°C (60°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and draining, which can hinder your travel experience.

September Average Humidity in Santo Tomas

This chart illustrates the average monthly humidity levels in Santo Tomas, 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 Santo Tomas is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%78%75%71%77%76%68%70%82%91%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Santo Tomas

In Santo Tomas 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 Santo Tomas, you can check here.

Maximum UV Index Levels in Santo Tomas for September

The chart shows the monthly maximum UV Index (UVI) for Santo Tomas 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 Santo Tomas typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec9121415151515141413108
Data source: Santo Tomas 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 Santo Tomas Compares to Other Months

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

This table compares monthly weather conditions in Santo Tomas, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)14 mm (0.6 inches)84%very high
February Weather13°C (55°F)12 mm (0.5 inches)78%extreme
March Weather14°C (58°F)24 mm (0.9 inches)75%extreme
April Weather16°C (61°F)42 mm (1.7 inches)70%extreme
May Weather17°C (63°F)57 mm (2.2 inches)77%extreme
June Weather16°C (61°F)155 mm (6.1 inches)76%extreme
July Weather15°C (60°F)126 mm (5.0 inches)68%extreme
August Weather15°C (60°F)162 mm (6.4 inches)70%extreme
September Weather15°C (60°F)173 mm (6.8 inches)82%extreme
October Weather14°C (58°F)105 mm (4.1 inches)91%extreme
November Weather12°C (54°F)29 mm (1.1 inches)89%very high
December Weather11°C (52°F)7 mm (0.3 inches)88%very high

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