Cancún weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: July, November – May
What is the weather like in Cancún in September?
In September, Cancún is hot: daytime highs average 29 °C, and even at night it stays warm at around 26 °C. The sea averages 29.3 °C – almost as warm as a bath. The sun shines for around 7 hours a day. It is the rainy season: rain falls on about 24 days, totalling 193 mm. On about 8 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a good month for a holiday in Cancún.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 77 | 73 | 70 |
| Day | 30° | 29° | 28° |
| Night | 27° | 26° | 25° |
| Sea | 29° | 29° | 29° |
| Sun | 8 h | 7 h | 6 h |
| Rain days | 21 | 24 | 20 |
More details for September
- Daylight
- 12 h 18 min06:34 – 18:52
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 16 km/haverage daily peak
- Cloud cover
- 61 %on average
- Hot days
- 8 days30 °C or more
- Time zone
- UTC−5America/Cancun
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %63 %
- Few rainy daysweight 20 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Cancún in September: quick answers
Is Cancún hot in September?
Yes. In September, Cancún is hot: daytime highs average 29 °C and nights stay around 26 °C. On about 8 days the thermometer climbs to 30 °C or more.
Can you swim in Cancún in September?
Yes. In September the sea averages 29.3 °C – almost as warm as a bath.
Does it rain much in Cancún in September?
It rains often – on about 24 days, adding up to 193 mm.
Cancún month by month
The whole year in CancúnAll destinations: MexicoCaribbean weather in SeptemberWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)