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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 18°C (64°F), with a minimum of 9°C (48°F) and a maximum reaching 28°C (82°F). Expect 125 mm (4.9 in) of precipitation spread over 17 days, contributing to a high average humidity of 86%. Perfect for those who enjoy a refreshing, damp climate!

September Temperature in San Ignacio

In September in San Ignacio, the average temperature is 18°C (64°F). Maximum temperatures can reach 28°C (82°F), while minimums can drop to as low as 9°C (48°F). This climate makes it an ideal destination for travelers looking to enjoy mild weather and pleasant outdoor activities.

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 18°C (64°F), with highs reaching up to 28°C (82°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec535763667070676764635853
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 precipitation amount is 125 mm (4.9 in) spread over 17 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 125 mm (4.9 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec151066176814074125501610
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 86%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel slightly uncomfortable as the air becomes thick and sticky, often leading to clammy skin and a constant need for hydration.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec71%64%49%47%55%77%82%83%86%83%80%83%
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 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 Ignacio, you can check here.

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 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec8111315151414141412108
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 Weather12°C (53°F)15 mm (0.6 inches)71%very high
February Weather14°C (57°F)10 mm (0.4 inches)64%extreme
March Weather17°C (63°F)6 mm (0.2 inches)49%extreme
April Weather19°C (67°F)6 mm (0.2 inches)47%extreme
May Weather21°C (71°F)17 mm (0.7 inches)55%extreme
June Weather21°C (71°F)68 mm (2.7 inches)77%extreme
July Weather20°C (67°F)140 mm (5.5 inches)82%extreme
August Weather20°C (68°F)74 mm (2.9 inches)83%extreme
September Weather18°C (64°F)125 mm (4.9 inches)86%extreme
October Weather17°C (63°F)50 mm (2.0 inches)83%extreme
November Weather14°C (58°F)16 mm (0.6 inches)80%very high
December Weather12°C (54°F)10 mm (0.4 inches)83%very high

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