Cancun weather in September is that time of year when the hottest summer months are behind us and temperatures start to cool a little – just a little! It is still a very hot and humid climate with maximum temperatures in the low nineties and minimums at the mid 70 range.

Weather Averages for Cancun in September

image Temperature 28°C82°F
image Low Temperature 24°C76°F
image High Temperature 32°C89°F
image Sunshine Hours 9 hrs
image Rainfall 229mm
Rainfall days 20 days
image Sea Temperature 29°C 84°F

In an average September 17 of the 30 days have temperatures going beyond 90F and every day of the month the temperature will exceed 80F. Once again these temperatures will feel even hotter than they actually are due to the high humidity which works similar to wind chill in reverse in exaggerating the actual temperature. Humidity levels in Cancun in September range from 75-85%, while the maximum humidity level is only slightly lower than in August the minimum level is a good 5 degrees higher than the traditionally warmest month of the year.

September, along with October, has the highest chance of hurricane formation affecting the area. The oceans to the south and east where hurricanes start their life now have their highest temperatures of the year and create ideal conditions for hurricanes to form. One should always remember that hurricanes that directly effect the area are still rare occurrences and by no means happen every year. It is however, advisable to take out extra travel insurance when traveling to the Cancun region at this time of year.

Sea temperatures in the waters surrounding Cancun will also be at their peak at this time of year and it is often the case that the ocean will actually be warmer than your hotel pool. September is the wettest month of the year with around 9 inches of rain in a typical month.

This 9 inches of rain typically falls over a total of 7 days, meaning that 23 days of the month are typically rain free. So you can figure out from those figures that it doesn’t rain that often but when it does rain it rains heavily. Those 7 rainy days are likely to be spread fairly evenly throughout the month rather than being one whole consecutive week of rain, you’ll be pleased to know the chances that your entire vacation will be rained out are virtually nil.