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September Weather in Tomatlan, Mexico

Last updated: August 27, 2025

In September, the average temperature in Tomatlan, Mexico hovers around 17°C (63°F). Expect cool nights with a minimum of 7°C (45°F) and pleasant days reaching up to 25°C (78°F). However, be prepared for the weather, as this month brings approximately 337 mm (13.3 in) of precipitation spread over 27 days, contributing to an average humidity of 82%.

September Temperature in Tomatlan

In September in Tomatlan, the average temperature is 17°C (63°F), with maximums reaching up to 25°C (78°F) and minimums dropping as low as 7°C (45°F). This makes it a comfortable time to explore Tomatlan, perfect for outdoor activities and sightseeing.

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

The chart illustrates September temperature patterns in Tomatlan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tomatlan, September typically has an average temperature of 17°C (63°F), with highs reaching up to 25°C (78°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec535659626463636363605654
Data source: Temperature data for Tomatlan 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 Tomatlan

In Tomatlan in September, the total precipitation amount is 337 mm (13.3 in) spread over 27 days.

September Precipitation Trends in Tomatlan

The chart displays monthly precipitation patterns in Tomatlan, 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 Tomatlan, September typically receives around 337 mm (13.3 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec73588810115026422530933726010437
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Tomatlan

In Tomatlan 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 Tomatlan

This chart illustrates the average monthly humidity levels in Tomatlan, 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 Tomatlan 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 Tomatlan

In Tomatlan 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 Tomatlan, you can check here.

Maximum UV Index Levels in Tomatlan for September

The chart shows the monthly maximum UV Index (UVI) for Tomatlan 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 Tomatlan typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec9121314151414141412108
Data source: Tomatlan 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 Tomatlan Compares to Other Months

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

This table compares monthly weather conditions in Tomatlan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (53°F)73 mm (2.9 inches)84%very high
February Weather13°C (56°F)58 mm (2.3 inches)78%extreme
March Weather15°C (59°F)88 mm (3.5 inches)75%extreme
April Weather17°C (62°F)101 mm (4.0 inches)70%extreme
May Weather18°C (64°F)150 mm (5.9 inches)77%extreme
June Weather17°C (64°F)264 mm (10.4 inches)76%extreme
July Weather17°C (63°F)225 mm (8.8 inches)68%extreme
August Weather17°C (63°F)309 mm (12.2 inches)70%extreme
September Weather17°C (63°F)337 mm (13.3 inches)82%extreme
October Weather16°C (61°F)260 mm (10.2 inches)91%extreme
November Weather13°C (56°F)104 mm (4.1 inches)89%very high
December Weather12°C (54°F)37 mm (1.4 inches)88%very high

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