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September Weather in Altamira, Mexico

Last updated: August 27, 2025

In September, the average temperature in Altamira, Mexico is a pleasant 18°C (65°F), with a minimum dipping to 9°C (48°F) and a maximum soaring to 28°C (83°F). Expect moderate precipitation totaling 124 mm (4.9 in) over 18 days, coupled with an average humidity of 86%, creating a humid atmosphere that adds to the region's unique charm.

September Temperature in Altamira

In September in Altamira, the average temperature is 18°C (65°F), with maximums reaching 28°C (83°F) and minimums dropping as low as 9°C (48°F). This pleasant climate makes Altamira an ideal destination for outdoor activities and exploration during this time.

September Weather in Altamira: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Altamira, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Altamira, September typically has an average temperature of 18°C (65°F), with highs reaching up to 28°C (83°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec545864687272686965645954
Data source: Temperature data for Altamira 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 Altamira

In Altamira in September, the precipitation amount is 124 mm (4.9 in) over a span of 18 days.

September Precipitation Trends in Altamira

The chart displays monthly precipitation patterns in Altamira, 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 Altamira, September typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec1511610186212864124531510
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Altamira

In Altamira in September humidity is 86%. With an average temperature of 18°C (65°F), this humidity feels like you’re wrapped in a warm, heavy blanket, making outdoor activities feel quite muggy and sticky for traveling.

September Average Humidity in Altamira

This chart illustrates the average monthly humidity levels in Altamira, 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 Altamira 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 Altamira

In Altamira 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 Altamira, you can check here.

Maximum UV Index Levels in Altamira for September

The chart shows the monthly maximum UV Index (UVI) for Altamira 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 Altamira typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec811131515141414141298
Data source: Altamira 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 Altamira Compares to Other Months

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

This table compares monthly weather conditions in Altamira, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)15 mm (0.6 inches)71%very high
February Weather15°C (58°F)11 mm (0.4 inches)64%extreme
March Weather18°C (64°F)6 mm (0.2 inches)49%extreme
April Weather20°C (68°F)10 mm (0.4 inches)47%extreme
May Weather22°C (72°F)18 mm (0.7 inches)55%extreme
June Weather22°C (72°F)62 mm (2.4 inches)77%extreme
July Weather20°C (69°F)128 mm (5.0 inches)82%extreme
August Weather21°C (69°F)64 mm (2.5 inches)83%extreme
September Weather18°C (65°F)124 mm (4.9 inches)86%extreme
October Weather18°C (64°F)53 mm (2.1 inches)83%extreme
November Weather15°C (59°F)15 mm (0.6 inches)80%very high
December Weather12°C (54°F)10 mm (0.4 inches)83%very high

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