Average high temperatures and rainfall in Cozumel in August. © Scott S. Bateman

Cozumel weather in August historically has hot temperatures and plenty of rainfall.

The largest and most popular Mexican island is a major destination for western Caribbean cruises and resort visitors. But Cozumel is more popular from December through April. That’s when rainfall is usually lower than it is during hotter and wetter summer months like August.

There are worse months to go than August. The island usually gets even more drenched in September and October than it does in August.

Temperatures in August

The average high temperature in Cozumel during August is 91 degrees Fahrenheit or 33 Celsius, according to Servicio Meteorológico Nacional, Mexico’s national meteorology service. It is the highest temperature of the year along with May and July. June is only one degree cooler on average.

The average low temperature in August is 74 degrees Fahrenheit or 23 Celsius. The low usually occurs at night.

Water temperatures during the month range about midway between the high and low air temperatures of the day. They are cooler in the mornings and warmer in the afternoons. Beach sand in the afternoons may feel painfully hot on bare feet.

These averages are based on 30 years of historical data and vary somewhat from year to year. But they offer trends that make it easier for vacationers to predict the weather.

Rainfall in August

For Cozumel, rainfall historically spikes briefly in June to nearly eight inches. It drops to about five inches in July and increases to nearly six inches in August, according to Servicio Meteorológico Nacional. It is nearly 10 inches a month in September and October, which are the riskiest times to visit the island for weather.

In contrast, rainfall averages about two inches a month from February through April. So August is not the worst month of the year for rain, but it’s also far from the best.

Historically, it rains about 13 days during August compared to only four days in March and April and about 16 days in September and October.

• Cozumel weather in: January, February, March, April, May, June, July, August, September, October, November, December