The weather is warm in August and in many areas it is one of the hottest months of the year. September in Mexico is the rainy season with the biggest chance for hurricanes in many areas. In Baja California, tropical storms are common during this time with temperatures around 95-105 °F. It tends to also get rainy but since it is hot, an umbrella is better suited than a jacket. The Pacific Coast sees a lot of heat and quite a lot of rain but hurricanes are rare here. You can expect temperatures around 85-90 °F.
In the Yucatán Peninsula, the heat wears off a bit in August and the weather becomes more pleasant. However, temperatures are still pretty high with approximately 90 °F. The humidity continues to be high and it gets rainy but not as rainy as the Pacific Coast. The rain brings a nice cool off which is welcomed by many due to the warm weather. Keep an eye on the weather forecast since it is hurricane season and storms can occur. If you want milder weather and take a break from the heat, Mexico City is perfect for that, as well as the north of the country. When it rains, it usually happens in the afternoon so you have plenty of time to enjoy morning and early afternoon activities outdoors.
Crowds & Costs
September in Mexico is a pretty quiet month and there are not a lot of tourists in general. When kids go back to school, and due to the heat and the rainy season, you won't see big crowds. It is a great opportunity to book those cheaper hotels and get better deals on flights. It does affect tour and activity availability but all of the main attractions are open, such as Chichén Itzá. The beaches are quieter as well and if you are looking for a nice and relaxing vacation, without a lot of people around, this is a good time to visit Mexico.
Where to go
Whether you are looking for more activities or just relaxing on a white-sand beach, there are a lot of places to go in September. Some of the best spots are Tulum, Cancún, Puebla, Oaxaca, San Miguel de Allende, and Punta Mita. You can also make your way to Cozumel Island or Puerto Vallarta.
There is a lot of variety to these places and it all depends on what kind of vacation you are after. If you want to enjoy history and culture, visit Oaxaca and San Miguel de Allende. These are some of the most cultural cities in Mexico and the weather here in September allows you to enjoy great sightseeing and exploration.
If you want to enjoy marine life and diving, visit Guadalupe Island and Cozumel. The entire Sea of Cortez—one of the best diving spots in Mexico, has its liveaboard season in September. You can book several-day tours and enjoy diving and seeing the hammerhead sharks.
What to do
Diving in the Yucatán Peninsula is one of the best activities to enjoy in September. In Cozumel, you will find crystal-clear water with amazing marine life. It is definitely a great place for the adventurous traveler and also for the ones wanting to cool off in the waters.
On Guadalupe Island, you can go swimming with the Great White Sharks and a lot of divers visit the island to do just that. A tip is to go on a several-day tour and enjoy various diving spots, as well as enjoy swimming and snorkeling along the way. Since it is so hot in the south, you will really enjoy spending time in the water and have a lot of fun.
The conditions for diving and snorkeling are at their best in September and you can swim in many, many cenotes in the Yucatán Peninsula. In fact, there are more than 6,000 of them which makes this month the perfect time to explore the different caverns. The small number of visitors is another thing that makes this such a good time to go cenote diving and swimming.
Try the popular Cenote Dos Ojos or the less known Zazil Tunich. The latter requires you to book in advance, as a part of a tour but is well worth a visit. Other amazing cenotes in the Yucatán are cenote Chaak Tun and Grand Cenote. In the Chak Tun caves, you dive in semi-darkness and it is an interesting and exciting experience.
Events in September
Independence Day across the country, September 15-16. Mexico's Independence Day is celebrated across the country with parades, fireworks, and civic ceremonies. Some of the best places to experience this event are historic cities and towns with strong ties to the independence movement. These include Mexico City, Queretaro, San Miguel de Allende, Dolores Hidalgo, and Guanajuato.
Feria Nacional Zacatecas in the UNESCO-recognized city of Zacatecas, first to the third week in September. This event is a three-week celebration with a lot of musical performances, entertainment for kids, theater performances and other cultural events.
Fiesta de San Miguel in San Miguel de Allende, September 29 or the nearest weekend. This three-day event invites to a weekend filled with parades, dances, concerts, and fireworks.
Traveling to Mexico in September? Check out these great itineraries.
10 Days in Mexico - 5 Unique Itinerary Ideas. During ten days, you will have time to enjoy cultural sightseeing with outdoor activities, culinary tours, and relax on the beach. You will spend time in Mexico City, the idyllic Riviera Maya, and explore the lakes and waterfalls of Chiapas. A foodie tour is also on the menu in Oaxaca, and you will enjoy beach time on the Pacific Coast. Take the opportunity to go cenote diving in the Yucatán Peninsula and go snorkeling in the clear blue sea.
Magical Oaxaca & the Pacific Coast - 10 Days. Explore the cultural and natural highlights of Oaxaca on this ten-day itinerary around the region. You'll explore colorful marketplaces, see a 2,000-year-old tree, feel the spray of crystal-blue waterfalls, visit traditional villages in the Northern Highlands, learn how to make mole in a private cooking class, and spend the last few days on Oaxaca's idyllic Pacific beaches.