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October Weather in San Marcos, Mexico

Last updated: August 27, 2025

In San Marcos, Mexico, the average temperature in October is a crisp 18°C (64°F), with minimums dipping to 6°C (43°F) and highs soaring to 28°C (83°F). Expect about 43 mm (1.7 in) of precipitation spread across 6 days, and don't forget to brace for an average humidity of 83%.

October Temperature in San Marcos

In October, in San Marcos, the average temperature is 18°C (64°F). The maximum can reach 28°C (83°F), and the minimum can be as low as 6°C (43°F). This mild and varied climate makes San Marcos an ideal destination for travelers seeking comfortable weather and enjoyable outdoor activities.

October Weather in San Marcos: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in San Marcos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Marcos, October typically has an average temperature of 18°C (64°F), with highs reaching up to 28°C (83°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec545864687272696965645954
Data source: Temperature data for San Marcos 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.

October Precipitation in San Marcos

In San Marcos in October, the precipitation amount is 43 mm (1.7 in) over a period of 6 days.

October Precipitation Trends in San Marcos

The chart displays monthly precipitation patterns in San Marcos, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In San Marcos, October typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec121011915521366712543109
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in San Marcos

In San Marcos in October humidity is 83%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket enveloping you, making outdoor exploring somewhat sticky and requiring frequent hydration breaks.

October Average Humidity in San Marcos

This chart illustrates the average monthly humidity levels in San Marcos, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in San Marcos is approximately 83%, 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 October generated using information from the Copernicus Climate Change Service.

October UV Index in San Marcos

In San Marcos in October, 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 Marcos.

Maximum UV Index Levels in San Marcos for October

The chart shows the monthly maximum UV Index (UVI) for San Marcos in October, 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 October, the maximum UV index in San Marcos typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec811131414141414131297
Data source: San Marcos October 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 October Weather in San Marcos Compares to Other Months

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

This table compares monthly weather conditions in San Marcos, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)12 mm (0.5 inches)70%very high
February Weather15°C (59°F)10 mm (0.4 inches)62%extreme
March Weather18°C (64°F)11 mm (0.4 inches)53%extreme
April Weather20°C (68°F)9 mm (0.4 inches)48%extreme
May Weather22°C (73°F)15 mm (0.6 inches)52%extreme
June Weather22°C (73°F)52 mm (2.1 inches)64%extreme
July Weather20°C (69°F)136 mm (5.4 inches)73%extreme
August Weather21°C (70°F)67 mm (2.6 inches)71%extreme
September Weather18°C (65°F)125 mm (4.9 inches)82%extreme
October Weather18°C (64°F)43 mm (1.7 inches)83%extreme
November Weather15°C (59°F)10 mm (0.4 inches)82%very high
December Weather12°C (55°F)9 mm (0.3 inches)84%high

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