What to pack for Cancún in September
- light, breathable clothing
- sun protection (hat, SPF 50)
- a compact umbrella or rain shell — rain is frequent
- expect humid, sticky conditions
Humidity averages 83%; max daily wind around 15 km/h.
How September compares
Best months in Cancún: December–March. See the full best time to visit Cancún guide.
Cancún in September: the details
In September, Cancún sees average daytime highs of 31°C (87°F) and overnight lows of 25°C (78°F). Rainfall totals roughly 166 mm across 20.2 rainy days, and the sun shines about 10.7 hours per day with 12.1 hours of daylight mid-month. Relative humidity averages 83%.
In context: September is the third-warmest month and the third-wettest in Cancún. The sunniest month is April (11.8 h/day).
| Metric | September average |
|---|---|
| Daytime high | 31°C / 87°F |
| Overnight low | 25°C / 78°F |
| Rainfall | 166 mm over 20.2 rainy days |
| Sunshine | 10.7 h/day (12.1 h daylight) |
| Humidity | 83% |
| Travel score | 3.8 / 10 |
These figures are climate normals computed from the ERA5 weather reanalysis (2019–2024) for Cancún, Mexico (21.17, -86.85) — see our methodology. Actual conditions vary year to year.
Not set on Cancún? Browse the best places to visit in September ranked by travel score.
Frequently asked questions
How hot is Cancún in September?
Daytime highs in Cancún in September average 31°C (87°F); nights drop to about 25°C.
Does it rain in Cancún in September?
Expect around 20.2 rainy days and 166 mm of rainfall in September.
Is September a good time to visit Cancún?
September is a challenging month to visit Cancún — consider December–March instead. Overall travel score: 3.8/10. The best months are December–March.
Also good in September, near Cancún
Where should you go next month?
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