nomadseason

September Weather in San Isidro, Mexico

Last updated: August 27, 2025

In September, the average temperature in San Isidro, Mexico is a pleasant 25°C (77°F), with a minimum of 20°C (69°F) and a maximum reaching up to 32°C (89°F). Expect 391 mm (15.4 in) of precipitation spread over 27 days, contributing to an average humidity level of 80%.

September Temperature in San Isidro

In September in San Isidro, the average temperature is 25°C (77°F), with maximums reaching 32°C (89°F) and minimums dipping as low as 20°C (69°F). This pleasant climate makes it an ideal time for travel and outdoor adventures.

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

The chart illustrates September temperature patterns in San Isidro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Isidro, September typically has an average temperature of 25°C (77°F), with highs reaching up to 32°C (89°F) and lows dropping to around 20°C (69°F).
JanFebMarAprMayJunJulAugSepOctNovDec757678797977787777777775
Data source: Temperature data for San Isidro generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in San Isidro

In San Isidro, in September, the total precipitation amount is 391 mm (15.4 in) spread over 27 days.

September Precipitation Trends in San Isidro

The chart displays monthly precipitation patterns in San Isidro, 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 Isidro, September typically receives around 391 mm (15.4 inches) of precipitation spread over approximately 27 days.
JanFebMarAprMayJunJulAugSepOctNovDec331139176327277355391323384
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in San Isidro

In San Isidro in September humidity is 80%. With an average temperature of 25°C (77°F), this humidity feels like traveling through a warm, tropical rainforest where the air is thick and steamy, making even the simplest stroll feel like a workout.

September Average Humidity in San Isidro

This chart illustrates the average monthly humidity levels in San Isidro, 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 Isidro is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%68%64%67%74%78%82%82%80%81%80%75%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Isidro

In San Isidro in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in San Isidro.

Maximum UV Index Levels in San Isidro for September

The chart shows the monthly maximum UV Index (UVI) for San Isidro 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 Isidro typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10121314141414131312109
Data source: San Isidro 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 Isidro Compares to Other Months

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

This table compares monthly weather conditions in San Isidro, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (75°F)3 mm (0.1 inches)70%very high
February Weather25°C (77°F)3 mm (0.1 inches)68%extreme
March Weather26°C (78°F)11 mm (0.4 inches)64%extreme
April Weather26°C (79°F)39 mm (1.5 inches)67%extreme
May Weather26°C (79°F)176 mm (6.9 inches)74%extreme
June Weather25°C (78°F)327 mm (12.9 inches)78%extreme
July Weather26°C (78°F)277 mm (10.9 inches)81%extreme
August Weather25°C (78°F)355 mm (14.0 inches)82%extreme
September Weather25°C (77°F)391 mm (15.4 inches)80%extreme
October Weather25°C (77°F)323 mm (12.7 inches)81%extreme
November Weather25°C (77°F)38 mm (1.5 inches)80%very high
December Weather24°C (76°F)4 mm (0.2 inches)75%very high

Compare San Isidro's Climate with Cities Worldwide