20-Year Climate Average
Cancún, Quintana Roo, Mexico Weather in September
Normal High
86°F
Normal Low
78°F
Rainy Days
~27 of the month
Chance of Rain
90%
Humidity
82%
UV index
Not available
Daylight
12.3 hours
Peak wind
9 mph
Usually good for: beaches and outdoor dining.
Based on September climate records from 2006–2025 (Open-Meteo Historical Weather Archive). These are planning averages, not a forecast. Data: Open-Meteo.com, CC BY 4.0.
Current conditions
Forecast versus the climate baseline
80°F
It currently feels like 89°F with 91% humidity, a 77°F dew point and 5 mph wind. Climate averages describe the month; this live reading is what matters for plans today.
88° / 79° · 88% rain
88° / 76° · 100% rain
86° / 76° · 92% rain
Best Months to Visit Cancún, Quintana Roo, Mexico
Ranked by historical rainy-day frequency — the driest months over the past 20 years.
Methodology
Monthly values use the 2001–2020 observation period. Temperature, precipitation, humidity or dew point, wind, UV and daylight are shown only when the selected source provides them; unavailable fields are never estimated or silently replaced. These are planning normals, not guarantees for a specific trip.
What is the weather like in Cancún, Quintana Roo, Mexico in September?
The 20-year average high in Cancún, Quintana Roo, Mexico in September is 86°F, with a low around 78°F and about 27 rainy days.