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September Weather in Los Altos, Mexico

Last updated: August 26, 2025

In September, the average temperature in Los Altos, Mexico reaches a warm 28°C (83°F), with lows dipping to 20°C (67°F) and highs soaring to 38°C (100°F). Expect 161 mm (6.3 in) of precipitation spread over 17 days, creating a humid atmosphere with an average humidity of 84%.

September Temperature in Los Altos

In September in Los Altos, the average temperature is 28°C (83°F), with maximums reaching up to 38°C (100°F) and minimums dropping as low as 20°C (67°F). This climate makes Los Altos an ideal destination for travelers seeking warm, sunny weather.

September Weather in Los Altos: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Los Altos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Los Altos, September typically has an average temperature of 28°C (83°F), with highs reaching up to 38°C (100°F) and lows dropping to around 20°C (67°F).
JanFebMarAprMayJunJulAugSepOctNovDec687074798383848482797369
Data source: Temperature data for Los Altos 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 Los Altos

In Los Altos in September, the total precipitation amount is 161 mm (6.3 in), recorded over a span of 17 days.

September Precipitation Trends in Los Altos

The chart displays monthly precipitation patterns in Los Altos, 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 Los Altos, September typically receives around 161 mm (6.3 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec4528354411112694891611664721
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Los Altos

In Los Altos in September, humidity is 84%. With an average temperature of 28°C (83°F), this humidity feels like a thick blanket enveloping you, making every step feel heavier and the air almost stifling for traveling.

September Average Humidity in Los Altos

This chart illustrates the average monthly humidity levels in Los Altos, 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 Los Altos is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%86%83%80%82%79%72%74%84%92%91%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Los Altos

In Los Altos 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 Los Altos.

Maximum UV Index Levels in Los Altos for September

The chart shows the monthly maximum UV Index (UVI) for Los Altos 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 Los Altos typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec710111212121312121087
Data source: Los Altos 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 Los Altos Compares to Other Months

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

This table compares monthly weather conditions in Los Altos, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather20°C (68°F)45 mm (1.8 inches)88%high
February Weather21°C (70°F)28 mm (1.1 inches)86%very high
March Weather23°C (74°F)35 mm (1.4 inches)83%extreme
April Weather26°C (79°F)44 mm (1.7 inches)80%extreme
May Weather28°C (83°F)111 mm (4.4 inches)82%extreme
June Weather29°C (84°F)126 mm (5.0 inches)79%extreme
July Weather29°C (84°F)94 mm (3.7 inches)72%extreme
August Weather29°C (85°F)89 mm (3.5 inches)74%extreme
September Weather28°C (83°F)161 mm (6.3 inches)84%extreme
October Weather26°C (79°F)166 mm (6.5 inches)92%very high
November Weather23°C (73°F)47 mm (1.8 inches)91%very high
December Weather21°C (69°F)21 mm (0.8 inches)91%high

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