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September Weather in Santo Tomas, Mexico

Last updated: August 27, 2025

In September, the average temperature in Santo Tomas, Mexico is a pleasant 17°C (63°F). Expect a range from a cool 6°C (43°F) to a warm 30°C (86°F). This month brings about 76 mm (3.0 in) of precipitation over approximately 12 days, with an average humidity of 82%.

September Temperature in Santo Tomas

In September, in Santo Tomas, the average temperature is 17°C (63°F). The maximum can reach 30°C (86°F) and the minimum can be as low as 6°C (43°F). This makes Santo Tomas a great destination for travelers looking to enjoy mild weather with opportunities for both warm and cool 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 17°C (63°F), with highs reaching up to 30°C (86°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec434652596571676663595143
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 total precipitation amount is 76 mm (3.0 in), occurring over the course of 12 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 76 mm (3.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec131516363019015176302116
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 17°C (63°F), this humidity feels like a warm blanket wrapping around you—comfortable yet heavy, making outdoor activities more taxing and requiring frequent breaks for hydration.

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.
JanFebMarAprMayJunJulAugSepOctNovDec78%69%63%50%39%36%60%78%82%76%80%85%
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 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 Santo Tomas.

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 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec69111313141313121086
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 Weather6°C (43°F)13 mm (0.5 inches)78%high
February Weather8°C (46°F)15 mm (0.6 inches)69%very high
March Weather11°C (52°F)16 mm (0.6 inches)63%extreme
April Weather15°C (59°F)2 mm (0.1 inches)49%extreme
May Weather18°C (65°F)6 mm (0.2 inches)39%extreme
June Weather22°C (71°F)30 mm (1.2 inches)36%extreme
July Weather19°C (67°F)190 mm (7.5 inches)60%extreme
August Weather19°C (66°F)151 mm (5.9 inches)78%extreme
September Weather17°C (63°F)76 mm (3.0 inches)82%extreme
October Weather15°C (59°F)30 mm (1.2 inches)76%very high
November Weather11°C (51°F)21 mm (0.8 inches)80%very high
December Weather6°C (44°F)16 mm (0.6 inches)85%high

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