The heat: official advice
Mexico's health ministry recommends the following in hot weather:
- Drink water constantly, even if you're not thirsty.
- Avoid the sun during the most intense hours (11 a.m. to 5 p.m., according to its 2026 guide).
- Wear light, pale clothing and a hat or cap.
CENAPRED, Mexico's disaster prevention center, adds staying in the shade or cool places and avoiding strenuous exercise in the sun. The groups most at risk of heatstroke are children, older adults, pregnant women and people with disabilities or chronic illnesses.
What that means on a day trip
- Ruins early: Chichén Itzá, Uxmal and Tulum have little shade.
- Water at midday: cenotes are the best place to spend the hottest hour. That's why many Mary Tours trips schedule the cenote after the walk.
- On a boat (Celestún, Río Lagartos, Bacalar): hat, sunglasses and biodegradable sunscreen, since there's no shade.
- A refillable water bottle per person.
Mosquitoes
There are mosquitoes in mangroves, wetlands, cenote trails and at dusk. Mexico's health ministry notes that dengue is spread by the bite of female Aedes aegypti and Aedes albopictus mosquitoes, and recommends:
- Using repellent according to the product instructions.
- Wearing long sleeves and long pants as a barrier.
- At your accommodation, screens on doors and windows.
At cenotes, apply repellent away from the water and follow the site's rules: many ask you to shower before getting in so the water stays clean.
Your heat-and-mosquito kit
- Water and something salty for the road.
- A hat and sunglasses.
- Biodegradable sunscreen.
- Insect repellent.
- Light, pale clothes and a long-sleeved shirt.
Fun facts
- Dengue is spread only by female mosquitoes of two Aedes species.
- There are four serotypes of the dengue virus.
- Many cenotes ask visitors to shower before swimming to protect the water.
Related tours
Cenotes · 7 h
The four cenotes of Santa Bárbara
Four different cenotes and a lunch made by hand
from $1,450 MXN per person
See itinerary
10:00 AM – 5:00 PM · daily
- 10:00 AM Departure from the office — An hour on the road to Homún, through the ring of cenotes.
- 11:00 AM Cascabel cenote — Closed, cave type. You descend inside and the water sits in half-light: the most striking of the four.
- 11:30 AM Chaksikín cenote — Semi-open. You go down between limestone walls painted with Maya-themed murals.
- 12:00 PM Xooch cenote — Semi-open, with a shaft of light that falls straight onto the water mid-morning.
- 12:30 PM Pool Cocom cenote — Open and surrounded by vegetation. You swim along a channel out to the wide part.
- 1:30 PM Regional lunch — Home cooking with hand-made tortillas. Plenty of time to eat without rushing.
- 4:00 PM Back to Mérida — An hour back, arriving around five.
Included: Transport, Certified guide, Entry to all four cenotes, Regional lunch
Not included: Drinks with lunch
Nature · 9 h
Celestún and the pink flamingos
The largest flamingo colony in North America
from $1,600 MXN per person
See itinerary
8:00 AM – 5:00 PM · daily
- 8:00 AM Departure from the office — An hour and a half west, out to the port.
- 9:30 AM Boat ride — Flamingo and bird watching, the mangrove tunnel, the freshwater spring and the Maya bath on the sandbar.
- 11:00 AM Lunch by the beach — Fish, octopus or shrimp from the gulf, at a table facing the sea.
- 1:00 PM Free time on the beach — Almost three hours to swim, walk the shore or do nothing at all.
- 4:00 PM Back to Mérida — Arriving around five.
Included: Transport, Guide, Boat ride, Lunch from a set menu
Not included: Drinks
Archaeology · 11 h
Chichén Itzá, Izamal and Valladolid
Four stops in one day, and none of them rushed
from $1,200 MXN per person
See itinerary
8:00 AM – 8:00 PM · daily
- 8:00 AM Departure from the office — An hour on the road to Izamal. The guide uses the drive to set up what comes next.
- 9:00 AM San Antonio de Padua Convent — The story of the 16th-century Franciscan convent told in its atrium, then free time to walk the yellow town.
- 11:15 AM Chichén Itzá — Guided walk through the Temple of Kukulkán, the Sacred Cenote, the Ball Court, the Tzompantli and the Jaguars and Eagles platform.
- 1:45 PM Regional lunch in Kaua — Buffet of Yucatecan dishes: cochinita, relleno negro, lime soup and meat-free options.
- 3:00 PM Selva Maya cenote — The swim lands exactly when the sun is at its worst. Changing rooms and showers on site.
- 4:20 PM Valladolid — Francisco Cantón Rosado park with its original railings, the church of San Servacio and the murals in the town hall.
- 8:00 PM Back in Mérida — We drop you off where the day started.
Included: Air-conditioned transport, General culture guide, Regional buffet lunch
Not included: Chichén Itzá entrance, Cenote entrance, Drinks
Cenotes · 7 h
Hacienda Mucuyché
A stone channel joining two cenotes
from $1,800 MXN per person
See itinerary
9:30 AM – 4:00 PM · daily
- 9:30 AM Departure from the office — An hour on the road to the estate, in the municipality of Abalá.
- 10:30 AM Check-in and historical tour — A guide from the estate itself explains how the henequen business worked and what survives of it.
- 11:00 AM Carlota and Azul Maya cenotes — Two hours in the water. To move between the cenotes you cross the channel, swimming or along the stone path.
- 1:00 PM Time for lunch — Yucatecan food at the estate restaurant, paid per order. There is a pool for anyone who wants to stay in the water.
- 3:00 PM Back to Mérida — An hour back.
Included: Transport, Guide, Entry to the hacienda and cenotes
Not included: Food, Drinks
Frequently asked questions
When is it hottest in Yucatán?
The health ministry recommends avoiding the sun between 11 a.m. and 5 p.m. on hot days.
Are there mosquitoes at cenotes?
There can be on the trails and around them, especially in the rainy season and at dusk. Bring repellent.
Can I wear repellent in the cenote?
Apply it away from the water and follow each cenote's rules; many ask you to shower before swimming.
Who is most at risk from the heat?
Children, older adults, pregnant women and people with disabilities or chronic illnesses.
