Isla Mujeres has a tropical savanna climate with warm weather all year. The island, about 13 km (8 miles) off the coast of Cancun, averages 27°C (81°F) and runs on two clear seasons: a dry stretch from November through April and a rainier, more humid stretch from May through October. Here’s the month by month breakdown of Isla Mujeres weather, plus what the hurricane and seaweed seasons mean for your trip.
Isla Mujeres Weather: Dry Season and Wet Season
The dry season runs November through April. Days sit around 27 to 30°C (81 to 86°F), humidity drops to about 75%, and rain is limited to the odd passing shower, with monthly totals under 60 mm. December through February can bring short nortes, cool fronts that push temperatures down to 18 to 20°C (64 to 68°F) at night for a few days at a time. The wet season runs May through October, when afternoon storms roll through most days and humidity climbs past 80%. Even then, rain usually arrives in a 30 to 60 minute downpour, not all-day drizzle. If you’re deciding when to come, see our best time to visit Isla Mujeres guide for the trade-offs.
Isla Mujeres Weather by Month: Temperature and Rainfall
The table below shows average highs, lows, monthly rainfall, and sea temperature for each month of the year.
| Month | Avg High | Avg Low | Rainfall | Sea Temp |
|---|---|---|---|---|
| January | 27°C (81°F) | 20°C (68°F) | 40 mm | 26°C (79°F) |
| February | 28°C (82°F) | 20°C (68°F) | 35 mm | 26°C (79°F) |
| March | 29°C (84°F) | 21°C (70°F) | 30 mm | 26°C (79°F) |
| April | 30°C (86°F) | 22°C (72°F) | 40 mm | 27°C (81°F) |
| May | 31°C (88°F) | 24°C (75°F) | 90 mm | 28°C (82°F) |
| June | 32°C (90°F) | 25°C (77°F) | 150 mm | 28°C (82°F) |
| July | 32°C (90°F) | 25°C (77°F) | 90 mm | 29°C (84°F) |
| August | 32°C (90°F) | 25°C (77°F) | 110 mm | 29°C (84°F) |
| September | 31°C (88°F) | 24°C (75°F) | 200 mm | 29°C (84°F) |
| October | 30°C (86°F) | 23°C (73°F) | 210 mm | 28°C (82°F) |
| November | 29°C (84°F) | 22°C (72°F) | 80 mm | 27°C (81°F) |
| December | 28°C (82°F) | 21°C (70°F) | 50 mm | 26°C (79°F) |
September and October are the wettest months, with about 200 mm of rain each, while March is the driest at roughly 30 mm. The summer heat is tempered by the ocean breeze, so it rarely feels as hot as the 32°C (90°F) high suggests. July brings the annual Whale Shark Festival, one of the island’s biggest events and festivals, and the water is warm enough to snorkel every day of the year, so most things to do in Isla Mujeres stay open through the summer.
Isla Mujeres Weather: Humidity, Sunshine and Sea Temperature
Humidity on Isla Mujeres runs 75 to 85% year round, lowest from January through April and highest in September and October. The island gets about 2,700 hours of sunshine a year, roughly 7 to 8 hours a day even in the wet season, when mornings are typically sunny and storms hold off until the afternoon. Sea temperature ranges from 26°C (79°F) in January to 29°C (84°F) in August and September, warm enough for swimming in every month of the year. That steady water temperature is a big reason beachfront stays on Playa Norte book out months ahead.
Isla Mujeres Weather: Hurricane and Seaweed Season
The Atlantic hurricane season runs June 1 through November 30, with the highest risk of storms in August, September, and October. Direct hits are rare, but a storm tracking anywhere in the Caribbean can bring several days of heavy rain and rough seas, and the ferry from Cancun sometimes pauses in high winds. Separate from hurricanes, sargassum seaweed can wash onto east-facing beaches between April and October, worst from May through August. Playa Norte faces north and west, so it usually stays clear even when other beaches are affected. If a storm is forecast, rebook rather than ride it out, and check our Isla Mujeres travel tips for insurance advice, plus the where to stay in Isla Mujeres guide for refund-friendly hotels.
