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Cancun Weather in September: Rain, Temperatures

Cancun weather in September
Average high temperature and rainfall for Cancun in September. © 2021 Scott S. Bateman

Cancun in September is a risky time to visit this major resort city on the Caribbean coast of Mexico.

September historically is the worst weather month of the year for Cancun. The weather in Cancun for September has an average high temperature of about 91 degrees Fahrenheit. But the average rainfall is a total downpour of nine inches.

Cancun is popular because of attractions, cheap airline flights and easy access for visitors from the eastern and southern United States. It also is popular especially from December through May each year because of warm weather and low risk of rain.

Rain in September

The risk of rain climbs from a low point in late winter to a high point in early fall. The city’s average rainfall of nine inches during the month is the highest of the year. It is a big change from the one to two inches a month from February through April.

October has slightly less rain than September at a total of nine inches. Both months experience high rainfall historically because they are the peak months of the annual Caribbean hurricane season.

The city also averages about 14 days with rain during the month, which is better than the 16 days in October. Even so, when it does rain, it often rains a lot.

The high risk of rain makes September the worst month of the year to visit Cancun. Daring vacationers may go then because of cheap hotel prices. They also consider last-minute vacations if they see the short-term weather forecast shows a low risk of rain.

Cancun Temperatures in September

Cancun temperatures in September stay hot despite the fact that fall begins during the month. The average high temperature of 91 degrees Fahrenheit or about 33 Celsius is about the same as May through August.

The average low temperature, which mostly occurs at night, is 76 Fahrenheit or about 25 Celsius. The hot daytime temperatures and moderate nighttime temperatures will make seawater comfortable for swimming throughout the day, unlike the cooler winter months.

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Scott S. Bateman is a professional journalist who has traveled widely throughout the Caribbean and the Americas. He is the author of four books about cruising in the Caribbean, Alaska and Mexican Riviera.
August 22, 2021

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