CANCUN · MAY · 21.2° N
May is the last month before Cancun’s wet season shows up in the totals. Days run to an average high of 84.3°F, the Caribbean sits at 82.6°F, and rain adds up to 3.58 inches across the month, against 6.59 inches in June.
What May takes away is April’s dry-season margin: 7.6 days with measurable rain instead of 3.4. What it puts back is a warmer sea, thirteen hours of daylight and a calendar with only one American long weekend in it. For the full twelve-month comparison, that work lives in our Cancun month-by-month guide.
THE MONTH AT A GLANCE · CANCUN IN MAY
Book May if you want warm water without June’s rain totals: the sea averages 82.6°F, the month collects 3.58 inches of rain against June’s 6.59, and May 15 carries 13 hours 12 minutes of daylight.
AVERAGE HIGH 84.3°F · SEA 82.6°F · 7.6 RAIN DAYS · BEFORE JUNE’S 6.59 INCHES
Go for: a sea at 82.6°F, archaeological zones walked before 9 a.m., and a rain column that still reads 3.58 inches rather than June’s 6.59.
Think twice before: booking non-refundable if the trip needs dry afternoons: 7.6 days of an average May record measurable rain, more than double April’s 3.4.
Air and rain: Open-Meteo / ECMWF ERA5 reanalysis, 1991-2020 · Sea: Open-Meteo Marine API, 2015-2024 · full sources at the end
On this page
- Cancun weather in May84.3°F days, 3.58 inches of rain
- Sea temperature in May82.6°F, and what the figure hides
- How busy Cancun gets in MayMemorial Day, booking and the state tax
- Things to do in MayEl Rey, Isla Mujeres, Chichén Itzá
- A two-day plan around the heatHour by hour, from a 6:07 a.m. sunrise
- May, April or June?How the three months compare, column by column
- Is May a good month to go?Who should book it and who should not
- The best month overall in CancunCancun month by month
Every figure here comes from one model grid cell centered at 21.17° N, 86.85° W, over Cancun and its strip of Quintana Roo coast. That is a reanalysis rather than a thermometer at the airport, and the inland Yucatán behind the city runs hotter and drier than these numbers suggest.
Cancun weather in May: average highs, lows and rain days
| May in Cancun | The figure |
|---|---|
| Average high | 84.3°F |
| Average low | 77.5°F |
| Precipitation | 3.58 inches |
| Days with 0.10 in or more | 7.6 |
| Days with 1 inch or more | 0.5 |
| Daylight on May 15 | 13 hours 12 minutes |
| Sea surface | 82.6°F |
Open-Meteo’s reanalysis of the ECMWF ERA5 model, averaged across the 1991-2020 normals period, puts May’s average high at 84.3°F, the average low at 77.5°F and precipitation at 3.58 inches. A reanalysis interpolates a grid cell rather than reading an airport station, so these belong to the coastline as a whole rather than to a runway at Cancún International. Drive an hour inland and the Yucatán is a warmer, drier place than this table describes.
Measurable rain, meaning at least 0.10 inch, falls on 7.6 days of an average May, roughly one day in four. Spread 3.58 inches over those 7.6 days and the mean wet day carries about half an inch, a total that arrives in a burst rather than a drizzle. April records 3.4 such days. Plan a week here and expect one or two afternoons rearranged, not a washed-out vacation.
Between the 84.3°F day and the 77.5°F night there are 6.8 degrees, less than most American cities move between three in the afternoon and dawn. Nothing in a May bag needs to be warm. Pack for humidity instead: a second shirt for the walk back, reef-safe sunscreen, and one light long-sleeved layer for restaurants and shuttle buses that run their air conditioning hard.
May 15 carries 13 hours 12 minutes of daylight. Quintana Roo keeps UTC-5 all year and skips daylight saving, so sunrise lands at 6:07 a.m. and sunset at 7:19 p.m. local time. Anyone flying in from the Eastern time zone arrives with a body clock already on that hour, which puts two cool hours at an archaeological zone before 9 a.m. within reach of a normal alarm.
Can you swim in Cancun in May? Sea temperature and what it feels like
The sea surface off Cancun averages 82.6°F in May, from the Open-Meteo Marine API across 2015 to 2024. Read the fine print on that one: the number is the mean of daily maxima, the warmest reading of each day, so it sits a shade above a true 24-hour average. A swim at 6:30 in the morning will feel slightly cooler than 82.6°F. One at four in the afternoon will not.
Above 80°F, getting in stops being an event. You can float for an hour without shivering, snorkel off Punta Nizuc without a shortie wetsuit, and leave small children in the shallows at Playa Langosta until they are bored rather than cold. The figure runs above April’s 81.6°F and 1.5 degrees below June’s 84.1°F, so May sits nearer the summer end of the range than the spring one.
On wind and swell, our data stops at temperature: the marine feed gave us sea surface and nothing on wave height for May, so no figure goes here. The same applies to sargassum, the seaweed question readers ask about this month. We found no monthly series we were willing to publish, and the reading that matters is the daily beach report your hotel posts the week you travel.
How busy is Cancun in May? Crowds, prices and the state visitor tax
May falls between two demand blocks: the winter and Easter season that thins out during April, and the summer school holidays that start filling flights toward the end of June. No monthly room-rate series sits in our data, so nothing here ranks May against the other eleven months on price. The calendar fact worth knowing is the one American long weekend inside it, Memorial Day, always the last Monday of May.
Lead time is editorial here rather than measured: we would not be comfortable inside six weeks for a late-May departure (est.), because that holiday weekend bunches demand into the final ten days. A beach strip with this much room inventory forgives lateness better than an airline does. If the dates are fixed to the holiday, lock the flight first and sort the hotel afterward.
Quintana Roo levies a state visitor tax on foreign travelers, paid once per trip. We could not verify a current amount against an official state source before publishing, so no figure appears above, and any number quoted elsewhere deserves a check on the state’s own portal. Budget a small per-person line for it and keep the payment confirmation on your phone.
One upgrade genuinely changes this month, and it is the room’s relationship to the water. At 84.3°F with Caribbean humidity behind it, the gap between a beachfront property and one across Boulevard Kukulcán is a swim at 6:30 a.m. rather than a walk with towels at 6:30 a.m. Room category and the view from the eleventh floor change the photographs, not the shape of the day.
Things to do in Cancun in May: El Rey, Isla Mujeres and Chichén Itzá
The combination May offers is a sea already at summer temperature and a rain column still at 3.58 inches. An inland day to Chichén Itzá in June sits inside a month with 13.6 days of measurable rain; in May the count is 7.6, roughly half. Cenote swimming and open-water snorkeling both fit into the same trip, on the same afternoon if the driving cooperates.
El Rey, the archaeological zone on the hotel strip itself, is a short walk from Playa Delfines and fits in the hour before breakfast heat. Museo Maya de Cancún holds the indoor version of the same history. Ferries to Isla Mujeres leave from Puerto Juárez and from docks along the strip, and Chichén Itzá is a full day with a drive at each end. Hours and ticket prices sit outside what we verified for May: INAH publishes the current ones for the ruins, the ferry lines publish theirs.
What this month changes is the air, not the water in the ground. A cenote holds close to the same temperature in May as in January, while the air above it climbs to an 84.3°F average high, and that widening gap is the entire sensation of a May cenote stop. On the coast the direction reverses: the Caribbean at 82.6°F gives back less heat relief than it did in April at 81.6°F.
Free in May, as in every month: the beaches. Mexico’s shoreline is federal public land, and the public access points at Playa Delfines, Playa Chac Mool and Playa Las Perlas open onto the same sand the resorts use. With sunset at 7:19 p.m., the lagoon side of the strip takes the color and the beach side takes the quiet. No free-admission day for May shows up in our sources.
Cancun in May: a two-day itinerary
Day one keys off the 6:07 a.m. sunrise. Be on the sand by seven for the coolest hour of the day, breakfast at 8:30, then El Rey or the Museo Maya between nine and eleven, before the air reaches its 84.3°F average. Lunch indoors from one to three. Back in the water at four with three hours of daylight left, and dinner after 7:19 p.m., in the dark, when the strip is at its most walkable.
Day two goes to the island or inland: the first ferry to Isla Mujeres, or a seven o’clock departure for Chichén Itzá so the site gets walked at opening rather than at one in the afternoon. If the sky turns, swap the order rather than the day. The museum, the lagoon-side restaurants and the cenotes all work wet, and half an inch of rain, the average wet-day total this month, costs an hour indoors rather than an afternoon.
Cancun in May vs April and June
| Figure | April | May | June |
|---|---|---|---|
| Average high | 82.8°F | 84.3°F | 84.6°F |
| Average low | 75.9°F | 77.5°F | 78.7°F |
| Precipitation | 1.48 in | 3.58 in | 6.59 in |
| Days with 0.10 in or more | 3.4 | 7.6 | 13.6 |
| Sea surface (daily maxima) | 81.6°F | 82.6°F | 84.1°F |
April collects 1.48 inches of rain across 3.4 days with measurable totals, against May’s 3.58 inches across 7.6 days and June’s 6.59 inches across 13.6. Air temperature barely separates May from June, 84.3°F against 84.6°F, while April sits a degree and a half cooler at 82.8°F. The sea moves the other way from the rain, climbing each month: 81.6°F, then 82.6°F, then 84.1°F, all three from the marine feed’s daily maxima.
Shift four weeks earlier and you trade one degree of water for less than half the wet days. Shift four weeks later and you pay 13.6 rain days for 1.5 degrees of extra warmth in the sea. For a beach week with children in the water, April is the better booking. For a trip built on snorkeling and inland driving, May holds the line, and June’s rain column is the reason not to push further.
Is May a good time to visit Cancun?
Yes for anyone whose trip is built around being in the water: 82.6°F sea, 84.3°F air, thirteen hours of daylight and a rain total near half of June’s. No for anyone who needs seven dry afternoons in a row, because 7.6 days of an average May carry measurable rain and none of them can be scheduled. Families tied to school calendars mostly cannot choose May at all, outside that last-Monday holiday weekend.
If the answer is no, move earlier rather than later. April gives up one degree of water, 81.6°F instead of 82.6°F, and cuts measurable rain days from 7.6 to 3.4, the largest single gain available inside this three-month window. June goes the wrong direction on every column except sea temperature, and pays 13.6 rain days for it.
Across these three months, May is the only one that pairs a sea above 82°F with a rain total under four inches.
The last word
Book May for the water and keep the afternoons loose. A full inch of rain in a single day turns up on 0.5 days of an average May, which works out to one such day every second year, so the realistic disruption is an hour indoors rather than a lost week. Set the alarm for the 6:07 a.m. light, put the inland day early in the trip so a gray afternoon can be traded, and keep the last two days for the beach.
Sources & data for this guide
- May normals: high 84.3°F, low 77.5°F, 3.58 in, 7.6 days at 0.10 in or more, 0.5 day at 1 in or more · Open-Meteo / ECMWF ERA5, 1991-2020 normals, grid cell 21.1743° N, 86.8466° W · model reanalysis, not an airport station record · checked Sep 15, 2026
- April and June normals and rain-day counts · same ERA5 grid cell and same 1991-2020 period · checked Sep 15, 2026
- Sea surface 82.6°F in May, 81.6°F April, 84.1°F June · Open-Meteo Marine API, mean of daily maxima 2015-2024 · checked Sep 15, 2026
- Daylight 13 h 12 m on May 15, sunrise 11:07 UTC and sunset 00:19 UTC, converted to 6:07 a.m. and 7:19 p.m. local (UTC-5, no daylight saving in Quintana Roo) · sunrise-sunset.org · checked Sep 15, 2026
- Quintana Roo state visitor tax: we could not verify a current amount against an official state source before publication, so no figure appears above · check the state portal when you book.
- Booking lead time is editorial judgment, marked (est.), not a measured series. Opening hours, ticket prices, ferry schedules and beach conditions change · confirm with INAH, the ferry operators and your hotel.