How warm is Cancún in September?

Typical highs are about 88°F and the sea is about 85°F. That is warm enough for long swims without a wetsuit.

Is there sargassum in Cancún in September?

In a typical year seaweed is high in September. It is usually lightest in January and December and heaviest in July and August. Landings vary a lot by year, wind and currents; Veabird's weekly sargassum report and each beach's page have the current forecast.

Is September hurricane season in Cancún?

September falls in the tropical storm season; the typical risk on a given day is high. It peaks in September. Travel insurance and flexible bookings help.

How crowded is Cancún in September?

Typically moderate, around Labor Day weekend and Mexican Independence Day. The quietest months are usually September and October.

Cancún in September

September is one of the weakest months for a beach trip to Cancún: a typical day grades C, the 12th best of the 12 months. Expect highs near 88°F, water around 85°F and about a 76% chance of rain on a given day. Sargassum (seaweed) is usually high in September. Beaches are typically moderate (Labor Day weekend and Mexican Independence Day). It is hurricane season, with high storm risk.

Typical dayC12th of 12 months

Highs / water88°FSea 85°F

Rain chance76%on a given day

SeaweedHightypical year

CrowdsModerateLabor Day weekend

Storm riskHighhurricane season

Cancún month by month

Typical grade and high for each month. Higher is better: A+ to F.

August: C · September: C · October: B-. The best months are usually February, April and May, and the weakest are August and September.

Best beaches in Cancún in September

Resorts with the best typical September, and their grades for the next few days.

Beach	Typical Sep	Seaweed	This week
Holbox Island Hotels	A-	Very low	SatC+SunC+MonC-TueCWedC
Villas Flamingos	A-	Very low	SatC+SunC+MonC-TueCWedC
Villas Delphines	A-	Very low	SatC+SunC+MonC-TueCWedC
Xaloc Resort	A-	Very low	SatC+SunC+MonC-TueCWedC
Club Las Hamacas	A-	Very low	SatC+SunC+MonC-TueCWedC
Bahia Tolok	B	Moderate	SatC+SunB+MonB+TueB+WedA-
Selina Hotel Cancun Lagoon Zona Hotelera	B	Moderate	SatCSunB-MonBTueB+WedB+
Hotel Villa Rolandi	B	Moderate	SatC+SunB+MonB+TueB+WedA-

Grades for the next few days from Veabird's beach forecast, updated Oct 3, 18:00 UTC. Higher is better: A+ to F.

Better beach options in September

Elsewhere in Mexico, Los Cabos (A-), Puerto Vallarta (B+) and Huatulco (B+) usually grade higher in September. Further afield: Maui (A), Oʻahu (A) and Kauaʻi (A). Every destination in September.

Questions

Is September a good time to visit Cancún?: September is one of the weakest months for a beach trip to Cancún: a typical day grades C, the 12th best of the 12 months. Expect highs near 88°F, water around 85°F and about a 76% chance of rain on a given day. Sargassum (seaweed) is usually high in September. Beaches are typically moderate (Labor Day weekend and Mexican Independence Day). It is hurricane season, with high storm risk.
How warm is Cancún in September?: Typical highs are about 88°F and the sea is about 85°F. That is warm enough for long swims without a wetsuit.
Is there sargassum in Cancún in September?: In a typical year seaweed is high in September. It is usually lightest in January and December and heaviest in July and August. Landings vary a lot by year, wind and currents; Veabird's weekly sargassum report and each beach's page have the current forecast.
Is September hurricane season in Cancún?: September falls in the tropical storm season; the typical risk on a given day is high. It peaks in September. Travel insurance and flexible bookings help.
How crowded is Cancún in September?: Typically moderate, around Labor Day weekend and Mexican Independence Day. The quietest months are usually September and October.

Plan it

Cancún & Isla Mujeres: this week's forecast, beach by beach
Mexico Beach Report: this week, updated every Monday
Compare dates and beaches on the map

Typical-month numbers from Veabird's year-ahead outlook for the 86 resorts here (median resort): 6 years of ERA5 climate normals, the seasonal pattern of the Atlantic sargassum belt, holiday crowd calendars and historical storm tracks. Any given year can differ; check the 16-day forecast before you go.