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Cozumel Weather in September: What to Expect and Travel Tips

BySherry Arkfeld Updated

Are you planning a Mexican vacation and wondering about Cozumel weather in September? You’re in the right place.

I lived in Cozumel for nearly two years and have experienced all the seasons firsthand.

September is one of the quietest months on the island. It’s hot, humid, and right in the middle of hurricane season.

But that also means smaller crowds and better prices. If you’re flexible and don’t mind the occasional storm, it can be a great time to visit.

Let’s take a closer look at what to expect so you can plan your trip with confidence.

Rocky shoreline meets clear turquoise water with a tall sailing ship visible in the distance under a bright blue sky. A few swimmers and a small boat float near the horizon, adding to the tropical seascape.

Overview of Cozumel Weather in September

  • Average High Temperature: Around 89°F (32°C)
  • Average Low Temperature: Approximately 75°F (24°C)
  • Water Temperature: Typically near 84°F (29°C)
  • Rainfall: About 9 inches (22.9 cm) on average
  • Humidity: Generally around 80%

September is a bit of a wildcard. You can have perfect sunshine in the morning and a thunderstorm by afternoon.

Still, it’s warm and tropical, and the ocean is usually calm and inviting.

What the Weather Really Feels Like

September feels like peak tropical island life. It’s hot. It’s humid. And it might rain on you. But if you can roll with the unpredictability, it’s a fun time to be here.

I once walked four blocks to the store on a perfectly sunny day. On the way back? Torrential rain. My umbrella barely helped, and I was soaked by the time I got home. I laughed the whole way.

Shelby, my dog, does not find these moments funny. She loves the ocean, but the second it rains on her walk, she demands to be carried. Apparently, she only likes water on her terms.

The point is, September weather keeps you on your toes. It’s all part of the adventure.

What to Pack For a Trip to Cozumel in September

  • Light Jacket or Sweater: You won’t need it outside, but air-conditioned restaurants and shops can be chilly. I bring this lightweight jacket that folds into its own pouch and works for sun protection, too.
  • Reusable Water Bottle: Stay hydrated. Cozumel tap water isn’t safe to drink, so bring purified water in a bottle that keeps it cold. I like this one with a covered straw lid to keep it clean.
Two wooden beach chairs placed on white sand, facing a calm, clear ocean. The sky above is a vivid blue with a few scattered clouds, creating a tranquil beach scene.

Things to Do in Cozumel in September

Here are some top picks for things to do in Cozumel in September:

Diving: Cozumel is one of the top scuba diving destinations in the world, and September is a great time to explore the reefs. The water is warm, visibility is usually excellent, and dive sites are less crowded.

Snorkeling: If diving isn’t your thing, snorkeling is just as good. Many beaches offer easy shore access to vibrant reefs filled with tropical fish and coral.

I like Buccanos for a beach club with great snorkeling. There are also plenty of free beaches where you can bring your own gear and snorkel right from the shore.

Visit the Cozumel Museum: When the rain rolls in, head to the island’s museum. It’s full of interesting exhibits on local history, ecology, and Mayan culture. There’s also a rooftop restaurant with a great view of the sea.

Chocolate Factory Tour: Yes, there’s real chocolate being made here. Take a tour, sample the goods, and learn about traditional Mexican chocolate-making.

Take a Cooking Class: Learn to make authentic Mexican dishes using local ingredients. It’s a fun, hands-on activity that you can take home with you.

Atlantis Submarine Adventure: Not into diving? No problem. Ride the submarine down over 100 feet to see Cozumel’s reefs and sea life without getting wet.

Explore by Jeep: Go on a jeep tour to explore the island’s beaches, jungles, and Mayan ruins. It’s a great way to cover more ground, especially when the weather’s unpredictable.

Mexico’s Independence Day: September’s biggest event is Mexico’s Independence Day. Cozumel celebrates with traditional music, dancing, food, and fireworks.

The “Grito de Dolores” is shouted by the mayor, and the parade features military groups, police, and local school kids. It’s one of the best events on the island.

Bronze statue of an eagle on a cactus with a snake in its beak stands prominently in front of a massive Mexican flag waving on a tall pole. The monument overlooks the ocean under a partly cloudy sky.

Safety Tips for September Travel

  • Hurricane Awareness: September is in the middle of hurricane season. Big storms are rare, but it’s smart to keep an eye on the forecast.
  • Travel Insurance: I always recommend travel insurance, especially during hurricane season. I use SafetyWing. (Check their rates here.)
  • Stay Flexible: Tour cancellations are more common this month. The port often closes to small boats on stormy days, which means no dive or snorkel tours.
  • Hydration and Sun Protection: Don’t underestimate the sun. Wear sunscreen, a hat, and drink plenty of water.
  • Slippery Surfaces: Rain makes sidewalks and tile floors slick. Watch your step, especially downtown.
  • Watch the Weather: Sudden storms can change water conditions fast. Always follow beach safety flags and warnings.

Helpful Resources

  • Cozumel Guest Assist App – This app is super helpful. If you need any assistance, including in an emergency, you can get help on the app.
  • The Weather Channel: Offers detailed weather information, including hourly and 10-day forecasts. Note that the weather in Cozumel changes quickly and extended forecasts aren’t usually accurate.

Frequently Asked Questions: Cozumel Weather in September

Is September a good time to visit Cozumel?

Yes, if you don’t mind a little rain. It’s less crowded and more affordable, and you’ll get to experience local events like Independence Day.

How much does it rain in September in Cozumel?

September averages about 9 inches (23 cm) of rain. It usually comes in short, heavy bursts.

Can you swim in Cozumel in September?

Absolutely. The water is warm and calm most of the time. Just keep an eye on weather conditions.

What is the best month to go to Cozumel?

December through May is typically the driest and most popular season, but September is great for a quieter trip.

Is Cozumel humid in September?

Yes. Humidity hovers around 80 percent, giving the air that warm, tropical feel.

A town square decorated with vibrant strings of multicolored triangular flags radiating from a central clock tower. The scene captures a festive atmosphere under a cloudy sky, with colonial-style buildings and palm trees in the background and a few birds on the ground.

Wrap-Up: Cozumel Weather in September

Cozumel in September is warm, humid, and full of surprises. With average highs around 89°F (32°C), you’ll want to spend plenty of time in the water or under some shade.

It’s not the most popular month to visit, but that’s part of the charm. You’ll have more space, more quiet, and more opportunities to connect with the local culture. Independence Day celebrations in Cozumel are something special and a great reason to visit in September.

A local dive guide once told me the off-season is called “Sept-hambre.” (“Hambre” means hungry.) It’s a tough month for local businesses, but for visitors, that often means more personal service and flexibility.

If you don’t mind a little unpredictability, September is a great time to enjoy the island on your own terms.

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Pro Tips for Your Mexico Trips

Do I need travel insurance?

YES. No matter when you visit Mexico, don’t forget to buy travel insurance. It’s a small price to pay for peace of mind. If you need it once it will pay for itself many times over. I highly recommend Safety Wing. They have a proven track record for customer satisfaction and a variety of coverage levels.

Is it safe to rent a car in Mexico?

YES. Renting a car in Mexico is not only safe, but it’s a great way to explore. Discover Cars is hands down the best rental car company. They check international and local companies to get you the best rates.

Will my phone work in Mexico?

Maybe — It depends on your company, so check with your provider. If you don’t have free service in Mexico, the least expensive option is to buy a Telcel SIM card. As Mexico’s largest carrier, Telcel has the best coverage of any Mexico SIM Cards. I have one and it’s been a lifesaver.

You can also get an eSIM. Airalo has coverage in over 200 countries/regions, including Mexico.

What’s the best way to book my Mexico accommodations?

For Mexico hotels, Booking.com is the best site, but for hostels, check out Hostel World. If you’re considering a Mexico Airbnb, don’t forget to check VRBO, which is often cheaper with more options.

What do I pack for Mexico?

 My Mexico packing list has all the info you need on packing for your trip to Mexico.

What’s the best site for great deals on flights to Mexico?

For finding cheap Mexico flights, I recommend using Skyscanner.

Do I need a visa for Mexico?

Probably Not. U.S., Canadian, and most European passport holders don’t need a visa for Mexico. To verify if you’ll need a Mexico travel visa check the Mexican Consulate’s website.
For assistance with all your worldwide visa questions, check out iVisa.

Sherry Arkfeld is a digital nomad, travel blogger, and copywriter living her dream of being able to work from anywhere in the world while exploring new places with her little dog, Shelby. Sherry is passionate about sharing her experiences to help other travelers and digital nomads. Sherry and Shelby are currently traveling slowly around Mexico with plans to eventually go (almost) everywhere.