nomadseason

September Weather in San Isidro, Mexico

Last updated: August 27, 2025

In September, the average temperature in San Isidro, Mexico is a pleasant 24°C (76°F). Expect the mercury to dip as low as 16°C (62°F) and soar to a maximum of 36°C (98°F). With 91 mm (3.6 in) of precipitation spread over 11 days, ensure you're prepared for occasional rain. Additionally, you'll experience a high average humidity of 82%, contributing to the warm and tropical atmosphere.

September Temperature in San Isidro

In September in San Isidro, the average temperature is 24°C (76°F), with maximums reaching up to 36°C (98°F) and minimums dropping as low as 16°C (62°F). This makes it an ideal time for travelers seeking warm weather and pleasant conditions for outdoor activities.

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 24°C (76°F), with highs reaching up to 36°C (98°F) and lows dropping to around 16°C (62°F).
JanFebMarAprMayJunJulAugSepOctNovDec596571778283808176736660
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 precipitation amount is 91 mm (3.6 in) over a period of 11 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 91 mm (3.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec7795112782399140712
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 82%. With an average temperature of 24°C (76°F), this humidity feels like wearing a warm, damp blanket, making travel uncomfortable and sticky as you explore.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%62%53%48%52%64%73%71%82%83%82%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec710121414131313131187
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 Weather15°C (59°F)7 mm (0.3 inches)70%high
February Weather18°C (66°F)7 mm (0.3 inches)62%very high
March Weather22°C (71°F)9 mm (0.3 inches)53%extreme
April Weather25°C (77°F)5 mm (0.2 inches)48%extreme
May Weather28°C (82°F)11 mm (0.4 inches)52%extreme
June Weather28°C (83°F)27 mm (1.1 inches)64%extreme
July Weather27°C (80°F)82 mm (3.2 inches)73%extreme
August Weather27°C (81°F)39 mm (1.5 inches)71%extreme
September Weather24°C (76°F)91 mm (3.6 inches)82%extreme
October Weather23°C (73°F)40 mm (1.6 inches)83%extreme
November Weather19°C (66°F)7 mm (0.3 inches)82%very high
December Weather16°C (60°F)12 mm (0.5 inches)84%high

Compare San Isidro's Climate with Cities Worldwide