Cancun Weather in May & June (2027): Heat, First Rains, Sea Temperature & Sargassum

Cancun weather in May and June is very hot and increasingly humid, with average highs of about 34 °C (93–94 °F), warm nights near 24–25 °C (76–77 °F) and a sea that warms from about 28 °C to 28.5 °C (82–83 °F). May is still fairly dry (about 87 mm of rain on 7 days), but June marks the start of the rainy season, with about 184 mm on 11 days, usually in short, heavy downpours. The Atlantic hurricane season opens on 1 June, although early-season storms are uncommon, and sargassum is often at its heaviest from late spring into summer. In return, May and June are among the quieter, better-value months of the year.

This guide is part of our month-by-month series. For the whole year in one table, see Cancun weather by month; to weigh weather against prices and crowds, read the best time to visit Cancun. Figures and dates were checked in October 2026, with holiday dates for May and June 2027.

Cancun Weather in May and June: The Numbers

Air temperatures and rainfall are the official 1991–2020 climate normals from Mexico’s National Weather Service (SMN) for the Cancún station (no. 23155). Sea temperatures are NOAA’s satellite-based OISST averages for 1991–2020 for the water off the Hotel Zone, the same sources as our year-round overview. Sunrise and sunset are calculated for Cancún, which stays on UTC−5 all year (the same clock as US Central time in summer).

Sources: SMN/CONAGUA Normal Climatológica 1991–2020, station 23155 Cancún; NOAA OISST v2.1 1991–2020 monthly mean. Averages, not a forecast.

June’s average is pulled up by some very wet years. The SMN record for the month is 512 mm in June 2013, including 203 mm on 1 June alone, and May 2018 brought 305 mm. Heat records are high too: 40 °C (104 °F) in June 2019 and 39 °C (102 °F) in May 2001. What the table cannot show is humidity: with nights that rarely drop below 24 °C (75 °F), the air feels heavier every week from mid-May on.

May vs June: What Changes

• May is the last month of the dry season and one of the hottest: its average high (34.2 °C) matches September’s. Rain picks up late in the month, the sea breeze weakens on some days and the humidity climbs. Crowds are low outside the long weekends.
• June is the start of the rainy season and one of the wettest months of the year, with about twice May’s rain. It usually falls as afternoon or evening storms rather than all-day rain. Hurricane season begins, and as US schools break up, more families arrive.

Heat, Humidity and the Start of the Rainy Season

By late spring the sun is almost directly overhead at midday, and shade becomes the most valuable thing at the beach. Plan outdoor sightseeing for the first hours after sunrise, around 6 am, and keep the middle of the day for the pool, a cenote or a long lunch. Ruins such as Chichén Itzá and Cobá are hard work in this heat; go at opening time, or choose shaded swims instead. Our best cenotes near Cancun lists the easiest ones to reach.

When the rains arrive, the typical pattern is a sunny morning, clouds building after lunch and a short, intense storm in the afternoon or evening, often with thunder, after which the sun may return. The “days with rain” figure counts any day with measurable rain, so 11 rainy days in June does not mean 11 lost beach days. Longer gray spells usually come with a tropical wave passing through. Pack a light rain jacket and keep boat trips for the morning.

Sea Temperature and Swimming

The Caribbean is warm in late spring: about 27.8 °C (82 °F) in May and 28.4 °C (83 °F) in June, comfortable for hours of swimming and snorkeling. With the winter cold fronts over, the north-facing beaches between Km 1 and Km 9 are usually calm, which suits young children; the east-facing beaches from Km 9.5 have more waves, so check the flags. Visibility on the reefs can drop for a day or two after heavy rain or strong wind. See our Cancun public beaches guide for swimming conditions at each beach.

Hurricane Season Starts on 1 June

The Atlantic hurricane season officially runs from 1 June to 30 November. According to the US National Hurricane Center, activity is usually low in June and climbs from August to a peak around 10 September. Early-season storms that do form tend to develop close to land, in the Gulf of Mexico or the western Caribbean, and are usually weaker and short-lived. In 2026, the season’s first named storm, Arthur, formed in mid-June and came ashore in Veracruz, on the other side of the country, without affecting Cancun. NOAA publishes its outlook for the next season in late May.

• For June trips, buy travel insurance that covers named storms when you book, not after a storm forms.
• Prefer flexible or free-cancellation rates.
• In the week before you fly, follow the National Hurricane Center (nhc.noaa.gov) and Mexico’s SMN (smn.conagua.gob.mx).

Sargassum in May and June

This is the main risk of a late-spring trip. Sargassum amounts in the Caribbean usually build through spring and peak around June, and May to August is when Cancun’s beaches are most likely to see heavy landings. In 2026, the University of South Florida’s satellite bulletins reported record-high amounts for May and, in the Caribbean, record levels for June; USF ranks 2026 as the second-largest sargassum year on record, after 2025. Quintana Roo’s environment ministry reported a record 138,000 tons collected by the end of September 2026.

Landings change from beach to beach and day to day with wind and currents. The north-facing beaches between Km 1 and Km 9 and the Costa Mujeres area usually fare better than the open east side, but none is immune. Before you book, read our Cancun sargassum guide; on the trip, check the state’s daily sargassum map and keep a cenote or island day up your sleeve. Resorts on the calm north side, such as Occidental Costa Cancun and Presidente InterContinental, are a sensible choice in these months, though not a guarantee.

Crowds, Prices and Holidays in May and June 2027

After Easter, Cancun enters its spring shoulder season. May is usually one of the best-value months of the year; June stays reasonable until the summer holidays build. Dates that move demand:

Most all-inclusive quotes already include the 21% in hotel taxes; the Cancún environmental fee (about 82 MXN per room per night, paid at check-in) and the one-time VISITAX (about 285 MXN per foreign visitor, paid only at visitax.gob.mx) come on top. Our taxes, VISITAX and tipping guide explains each one.

Events and Things to Do in May and June

• Swimming with whale sharks: the official season in the Mexican Caribbean runs from 15 May to 17 September. Sightings are often less consistent in the first weeks than in July and August; see our whale shark tour guide.
• Sea-turtle nesting: the season runs from about May to October, and the municipality protects nests on beaches such as Playa Delfines. Keep beach lights off at night and never touch nests or hatchlings.
• Cenotes and shaded swims: the best escape from midday heat.
• Snorkeling and diving: warm water and long days; book morning trips, before afternoon storms build.

What to Pack for Cancun in May and June

• Light, loose clothes in linen or quick-dry fabrics; you will not need a sweater.
• High-SPF, biodegradable sunscreen, a hat and a rash guard.
• A light rain jacket or compact umbrella for June storms, and a dry bag for boat trips.
• Insect repellent for evenings and jungle excursions after rain.
• Copies of your travel insurance and booking terms for June trips.

The full checklist is in our Cancun all-inclusive packing list.

Is May or June a Good Time to Visit Cancun?

Go in May if you want warm water, mostly dry weather, smaller crowds and good value, and you are comfortable with strong heat. It is one of the most underrated months, with one big caveat: sargassum. June suits travelers who want early-summer warmth before the July and August rush and can live with afternoon storms and a small early-season storm risk. Skip both if a seaweed-free beach every day is essential, or if heat and humidity wear you out. For drier, fresher air, see Cancun weather in March and April or January and February; for midsummer, read Cancun weather in July and August. Autumn and winter are covered in September and October and November and December. More planning guides are in our Cancun travel tips.

Frequently Asked Questions

How hot is Cancun in May?

Very hot. The SMN 1991–2020 average high for May is 34.2 °C (94 °F), the same as September, with lows around 24 °C (76 °F). Humidity rises through the month, so it feels hotter than the thermometer says.

Does it rain a lot in Cancun in June?

June is one of the wetter months, with about 184 mm of rain on 11 days on average. Most of it comes as short, heavy afternoon or evening storms, with sunshine before and after; long rainy spells are usually linked to tropical waves or storms.

Is June hurricane season in Cancun?

Yes, the season starts on 1 June, but June is one of its quietest months. Most activity comes from mid-August to mid-October. Book flexible rates and buy insurance early, but a June storm hitting Cancun is uncommon.

Is there sargassum in Cancun in May and June?

Often, yes. Late spring and early summer are usually the heaviest sargassum period, and 2026 set records for May and June in the Caribbean. North-facing beaches and Costa Mujeres usually fare better; check the daily sargassum map before you go.

What is the water temperature in Cancun in May and June?

About 27.8 °C (82 °F) in May and 28.4 °C (83 °F) in June, based on NOAA’s 1991–2020 satellite averages. That is warm enough for long swims at any time of day.