Cancun weather in September
Cancun averages 31°C by day and 25°C at night in September, with the sea at 29°C and about 180 mm of rain in the month.
Day
31°C
Night
25°C
Sea
29°C
Rain
180 mm
Flight from London
10h
What September feels like
September is hot but wet in Cancun: rainy season, so pack for showers.
The sea is warm at 29°C: comfortable for long swims.
It is rainy season: about 180 mm of rain falls in the month.
That is 11°C warmer than an average September day in London.
Of the 56 sun destinations we track, Cancun is the #15 warmest in September.
Want it warmer in September?
These are hotter than Cancun this month for at most an hour and a half more flying:
Cancun weather by month
September is highlighted. Compare with August and October, or see the full year in Cancun.
| Month | Day | Night | Sea | Rain |
|---|---|---|---|---|
| January | 26°C | 22°C | 27°C | 82 mm |
| February | 27°C | 23°C | 27°C | 47 mm |
| March | 28°C | 23°C | 27°C | 37 mm |
| April | 29°C | 24°C | 27°C | 40 mm |
| May | 30°C | 25°C | 27°C | 85 mm |
| June | 30°C | 26°C | 28°C | 197 mm |
| July | 31°C | 26°C | 29°C | 97 mm |
| August | 31°C | 26°C | 29°C | 132 mm |
| September | 31°C | 25°C | 29°C | 180 mm |
| October | 29°C | 25°C | 29°C | 180 mm |
| November | 28°C | 23°C | 29°C | 109 mm |
| December | 27°C | 22°C | 28°C | 82 mm |
Cancun in September: quick answers
Is Cancun hot in September?
September is hot but wet in Cancun: rainy season, so pack for showers. Average highs are 31°C and lows 25°C.
Can you swim in Cancun in September?
The sea is warm at 29°C: comfortable for long swims.
Does it rain in Cancun in September?
It is rainy season: about 180 mm of rain falls in the month.
What is the warmest month in Cancun?
July, at an average high of 31°C. The coolest is January at 26°C.
How long is the flight to Cancun from the UK?
About 10h direct from London, estimated from the 7,940 km distance. Check your airline for exact times.
Still choosing? See where is hot in September for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in September from 2016 to 2025, from the Open-Meteo historical weather archive (ECMWF ERA5 reanalysis). Sea temperature is the 2023 to 2025 average from the Open-Meteo marine archive. Rain is the average monthly total. Reanalysis describes an area about 25 km across, so sheltered resorts can run a degree or two warmer. Flight time is a distance-based estimate from London Heathrow.
Planning Cancun in September?
Save the restaurants, beaches and views you find on TikTok and Instagram for Cancun straight to a map, then let Dream Trip turn them into a day-by-day plan.
