How hot is Cancun in September?

Cancun averages 32C daytime highs in September with a sea temperature around 29C.

Destination head-to-head

Cancun or Belize in September?

Cancun scores 8.1 out of 10 in September against 6.7 for Belize. Warm sea, short flights, all-inclusive value and a whole Mayan world within two hours.

Quick verdict

Cancun for all-inclusive, nightlife, food scene. Belize for second largest barrier reef.

Cancun, Mexico

9/10

32C days, 29C sea, 210mm rain

Belize, Belize

6.8/10

32C days, 250mm rain

Rated side by side

Out of five on each criterion.

Cancun and Belize rated out of five on each criterion
What matters	Cancun	Belize
NightlifeBars, clubs and late-night energy
BeachesSand quality, water clarity and swimming
Food sceneRange, quality and local character
FamiliesKid-friendly resorts, pools and day trips
RomanceCouples, honeymoons and adults-only stays
Things to doExcursions, culture and day trips
All-inclusiveChoice and value of all-inclusive resorts
Value for moneyWhat a typical day actually costs
Easy and safeComfort for first-time visitors
Exploring soloHow easy it is to get out on your own
Flight accessDirect routes and flight time from North America

Side by side in September

Cancun compared with Belize
Factor	Cancun	Belize
Daytime high	32C	32C
Rainfall	210mm	250mm
Sea temperature	29C, swimmable	Varies by season
Beach quality	Wide white sand, calm Caribbean	4 out of 5
Getting there	under 5 hours from most of North America	2h 30m from Miami
Typical cost	Cheapest window of the year. The same resort can cost half its January rate.	Mid range
Between beach days	Chichen Itza, Tulum, cenotes, Isla Mujeres, reef snorkelling	Second largest barrier reef, English speaking

What is on in Cancun in September

Mexican Independence Day on 15 and 16 September, the biggest party of the year
Cheapest month in Cancun by a wide margin
Hurricane season peak, so buy flexible rates

Crowds. One of the quietest months. Ruins, cenotes and beach clubs feel almost private.

Prices. Cheapest window of the year. The same resort can cost half its January rate.

Seaweed. Sargassum can appear on some east-facing beaches. Isla Mujeres north beach and the cenotes are the reliable backup.

Storms. This is the statistical peak of hurricane season. Book refundable rates and travel cover, then enjoy the lowest prices of the year.

Dated plans and community meetups are listed on the Cancun events calendar.

Book Cancun for September

Prefer a plan first? Build a free day-by-day Cancun itinerary.

Where Belize genuinely wins

Second largest barrier reef
English speaking
Great jungle ruins

Pick Belize if second largest barrier reef is the single thing you care most about on this trip.

What catches people out

Domestic flights or long boats needed
Limited infrastructure
Higher costs than you expect

The Cancun edge

Cancun reaches the same reef system and Mayan world with paved roads, big hotels and cheap flights.

Cancun is the rare beach destination that also works as a base. The airport is one of the busiest in Latin America, the transfer to your hotel takes twenty minutes, and within two hours you can be swimming in a cenote, climbing a Mayan pyramid, snorkelling the second largest reef on the planet, or eating cochinita pibil in a downtown market for the price of a coffee elsewhere. That combination is why we keep building these comparisons and keep reaching the same conclusion.

Cancun wins for you? Start here.

Compare hotelsAll-inclusive, adults-only and boutique Explore activitiesRuins, cenotes, reef and boat days Find your areaHotel Zone, downtown or Isla Mujeres Build your tripFree day-by-day planner

Compare Belize in other months

Other places people compare with Cancun in September

See every destination comparison