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September Weather in San Ignacio, Mexico

Last updated: August 27, 2025

In September, the average temperature in San Ignacio, Mexico hovers around 28°C (83°F), offering a warm atmosphere. However, temperatures can fluctuate dramatically, with minimums dipping to 12°C (54°F) and maximums soaring to 43°C (109°F). Expect some rain, with precipitation totaling 28 mm (1.1 in) across about 2 days, and a comfortable average humidity of 75%.

September Temperature in San Ignacio

In September in San Ignacio, the average temperature is 28°C (83°F). Maximums can reach 43°C (109°F), and minimums can be as low as 12°C (54°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to ensure a comfortable stay.

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

The chart illustrates September temperature patterns in San Ignacio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Ignacio, September typically has an average temperature of 28°C (83°F), with highs reaching up to 43°C (109°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec616266707178858683777062
Data source: Temperature data for San Ignacio 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 Ignacio

In San Ignacio in September, the total precipitation amount is 28 mm (1.1 in) over the course of 2 days.

September Precipitation Trends in San Ignacio

The chart displays monthly precipitation patterns in San Ignacio, 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 Ignacio, September typically receives around 28 mm (1.1 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec1210140002828131612
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Ignacio

In San Ignacio in September humidity is 75%. With an average temperature of 28°C (83°F), this humidity feels like a warm blanket enveloping you, making outdoor activities feel particularly heavy, and prompting frequent breaks in the shade to stay comfortable while traveling.

September Average Humidity in San Ignacio

This chart illustrates the average monthly humidity levels in San Ignacio, 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 Ignacio is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%69%61%58%61%61%63%70%75%72%72%72%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Ignacio

In San Ignacio 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 San Ignacio.

Maximum UV Index Levels in San Ignacio for September

The chart shows the monthly maximum UV Index (UVI) for San Ignacio 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 Ignacio typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6810121212121212975
Data source: San Ignacio 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 Ignacio Compares to Other Months

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

This table compares monthly weather conditions in San Ignacio, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather16°C (62°F)12 mm (0.5 inches)71%high
February Weather17°C (63°F)10 mm (0.4 inches)69%very high
March Weather19°C (66°F)14 mm (0.6 inches)61%very high
April Weather21°C (71°F)0 mm (0.0 inches)58%extreme
May Weather22°C (71°F)0 mm (0.0 inches)61%extreme
June Weather25°C (78°F)0 mm (0.0 inches)61%extreme
July Weather29°C (85°F)2 mm (0.1 inches)63%extreme
August Weather30°C (86°F)8 mm (0.3 inches)70%extreme
September Weather28°C (83°F)28 mm (1.1 inches)75%extreme
October Weather25°C (77°F)13 mm (0.5 inches)71%very high
November Weather21°C (70°F)16 mm (0.6 inches)72%high
December Weather17°C (62°F)12 mm (0.5 inches)72%moderate

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