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September Weather in San Francisco Coatlan, Mexico

Last updated: August 27, 2025

In September, the average temperature in San Francisco Coatlan, Mexico hovers around a pleasant 20°C (68°F). Temperatures can dip to a minimum of 13°C (56°F) and peak at a comfortable 29°C (84°F). However, be prepared for wet weather, as the region sees an average precipitation of 441 mm (17.3 in) over 28 days, coupled with a humid atmosphere of 84%.

September Temperature in San Francisco Coatlan

In September in San Francisco Coatlan, the average temperature is 20°C (68°F). The maximum can reach 29°C (84°F), and the minimum can be as low as 13°C (56°F). This mild and pleasant climate makes it an ideal time for travelers to explore and enjoy the outdoors.

September Weather in San Francisco Coatlan: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in San Francisco Coatlan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Francisco Coatlan, September typically has an average temperature of 20°C (68°F), with highs reaching up to 29°C (84°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec646668707068686868686664
Data source: Temperature data for San Francisco Coatlan 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 San Francisco Coatlan

In San Francisco Coatlan in September, the total precipitation amount is 441 mm (17.3 in) over a period of 28 days.

September Precipitation Trends in San Francisco Coatlan

The chart displays monthly precipitation patterns in San Francisco Coatlan, 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 San Francisco Coatlan, September typically receives around 441 mm (17.3 inches) of precipitation spread over approximately 28 days.
JanFebMarAprMayJunJulAugSepOctNovDec171020532164313024484412432217
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Francisco Coatlan

In San Francisco Coatlan in September humidity is 84%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket, making travel a challenge as the air clings to your skin, and every step feels heavier in the mugginess.

September Average Humidity in San Francisco Coatlan

This chart illustrates the average monthly humidity levels in San Francisco Coatlan, 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 San Francisco Coatlan 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 San Francisco Coatlan

In San Francisco Coatlan 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 San Francisco Coatlan, you can check here.

Maximum UV Index Levels in San Francisco Coatlan for September

The chart shows the monthly maximum UV Index (UVI) for San Francisco Coatlan 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 San Francisco Coatlan typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11131515151515141413119
Data source: San Francisco Coatlan 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 San Francisco Coatlan Compares to Other Months

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

This table compares monthly weather conditions in San Francisco Coatlan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather18°C (65°F)17 mm (0.7 inches)84%extreme
February Weather19°C (66°F)10 mm (0.4 inches)80%extreme
March Weather20°C (68°F)20 mm (0.8 inches)73%extreme
April Weather21°C (70°F)53 mm (2.1 inches)67%extreme
May Weather21°C (70°F)216 mm (8.5 inches)72%extreme
June Weather20°C (69°F)431 mm (17.0 inches)73%extreme
July Weather20°C (69°F)302 mm (11.9 inches)76%extreme
August Weather20°C (68°F)448 mm (17.7 inches)80%extreme
September Weather20°C (68°F)441 mm (17.3 inches)84%extreme
October Weather20°C (68°F)243 mm (9.6 inches)89%extreme
November Weather19°C (67°F)22 mm (0.8 inches)88%extreme
December Weather18°C (65°F)17 mm (0.7 inches)88%very high

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