SeasonMapIsla Mujeres weather in December
Mexico
December in Isla Mujeres: hot, a little rain, with clean air — an excellent time to visit.
#5 of 12 months in Isla Mujeres · #205 of 1383 destinations to visit in December · comfort 87/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Isla Mujeres in December
Notes from nearby Cancún (14 km away)
Isla Mujeres doesn't have its own notes for December yet — these are about Cancún, close enough to share the season.
December is the forum's answer to the sargassum question: seaweed season runs roughly late February to September or October, and from November through February there is little to none — making December one of the cleanest-beach months of the year. Conditions sit around 27°C by day and 24 overnight, with the sea near 27°C too. Rain does show up in the averages, but regulars describe it as overnight or a brief afternoon shower rather than all-day, with the occasional run of two or three drizzly days. The one December-specific pattern: a cold front every ten to fourteen days drops temperatures a few degrees for a couple of days, enough to want long sleeves after dark.
Other months in Isla Mujeres
Isla Mujeres's forum calls March the best time of year weather-wise — sunny and hot with pleasant nights, though rainfall stays low rather than absent. Regulars flag March as typically the windiest month locally, and note a passing cold front can still knock a few degrees off the temperature, so a light wrap for the evening is worth having.
Add your own note from Isla Mujeres's card on the map.
Isla Mujeres climate normals — December
| Daytime high | 28°C / 82°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 70°F | |
| Feels like (high) | 31°C / 88°F | |
| Sea temperature | 27°C / 81°F | 😎 warm sea |
| Rainfall | 63 mm / 2.5 in | 🌦 some rain |
| Rainy days | 12 days | |
| Humidity | 80% | 💦 very humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 9.3 h/day | |
| Daylight | 10.9 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Isla Mujeres in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsFiestas de la Inmaculada, Day-tripper season, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Isla Mujeres's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherIsla Mujeres's weather doesn't swing hard through the year — comfort stays fairly steady in every month.
What's on in Isla Mujeres in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Festival
Fiestas de la Inmaculada
30 Nov – 8 DecMajor festivalCrowdedNine days for the island's patron saint, ending on 8 December with a procession of fishing boats around the bay, fireworks off the malecon and the centre closed to carts. Source ↗
- Season
Day-tripper season
15 Dec – 15 AprCruise seasonCrowdedThe island belongs to Cancun day boats between about ten and four in high season: Playa Norte fills in waves off the ferry, then empties by five and the centre goes back to the people who live there.
Nearby, and something's on
Within 300 km of Isla Mujeres — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Isla Mujeres?
Isla Mujeres in December — FAQ
- Is December a good time to visit Isla Mujeres?
- December in Isla Mujeres: hot, a little rain, with clean air — an excellent time to visit. It ranks #5 of 12 months for Isla Mujeres on SeasonMap's comfort score (87/100).
- What is the weather like in Isla Mujeres in December?
- In December, Isla Mujeres averages a daily high of 27.7°C and a low of 21.1°C, with about 63.4 mm of rain over roughly 11.6 rainy days.
- What is the air quality in Isla Mujeres in December?
- Isla Mujeres has a mean US Air Quality Index of about 42 in December.
Other months in Isla Mujeres
Compare Isla Mujeres in December
Warmer or cooler than Isla Mujeres in December
Similar destinations in North America — December
Within 300 km: Playa del Carmen's Dry season around 15 Nov – 30 Apr, and Tulum's Dry season around 15 Nov – 30 Apr.