Weather in Cancún in October

Shoulder season. October sits in between. You will get good days and you will lose some. You should expect rain on 21 days of the month, which is more days wet than dry.

October ranks 8 of 12 in Cancún: past the worst of the year but short of February, which is the month to book if the dates are open.

Rain on 21 of the month's 31 days, 6 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Natural fibres and a second shirt for the day. At 82% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 4 days top 30 °C — hot spells arrive, but they break; the day barely swings — 3.2 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest October day reached 31.7 °C and the coldest night fell to 20.8 °C, and the wettest single day dropped 87 mm — roughly 39% of the month's rain in one day.

October is moderately variable: 68 mm in the driest year against 541 mm in the wettest, around an average of 224 mm. Roughly two Octobers in three land near that average, and the third does something else entirely.

Wind is light at 8.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 82%, high enough to notice on the warm days without dominating them.

How October sits in the year

Temperatures hold steady either side: 30 °C in September, 28.8 here, 27.4 in November. Nothing about the timing within the month matters much. Rain is the thing that moves: November brings 8 days less of it, so pushing the dates later buys drier weather.

Daylight in October

11.7 hours of daylight, losing 0.6 hours across the month. That is between Cancún's extremes of 13.4 and 10.9 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 28.2 °C in October — warm enough that the water offers no relief from the heat. The sea peaks at 29 °C in August and bottoms out at 25.1 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

October in Cancún versus nearby

If Cancún is one option among several, the nearby comparison is worth making. Mérida is close enough to be a coin toss — within a degree on temperature, 5 days less rain. Key West is a better bet in October — within a degree on temperature, 5 days less rain.

So: October is a compromise. February is 30 points better and is what Cancún is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Cancún

See all twelve months in Cancún, or where else to go in October.