Cancún weather in September
September is one of the least pleasant months in Cancún: highs of 30°C (85°F) and about 166 mm (6.5 in) of rain on average. Nights average 26°C (79°F) and cloud cover 58% (NASA POWER, 2001–2025 averages). The sea averages 30°C (85°F). It is the 3rd wettest month of the year and the 4th warmest. Compared with August, it is cooler and wetter; October brings highs of 29°C (83°F) and 224 mm (8.8 in) of rain.
Is September a good time to visit Cancún?
least pleasant month Weather score 61/100.
September is one of the least pleasant months for weather in Cancún. For better conditions, consider Dec–May.
Does it rain a lot in Cancún in September?
Yes, it is one of the rainy months: about 166 mm (6.5 in) falls in an average September. It is the 3rd wettest month of the year.
How warm is Cancún in September?
Days average 30°C (85°F) and nights 26°C (79°F).
Cancún weather by month
| Month | High | Low | Rain | Cloud | Sea | Weather |
|---|---|---|---|---|---|---|
| January | 26°C (79°F) | 22°C (71°F) | 63 mm | 53% | 27°C (80°F) | best |
| February | 27°C (81°F) | 22°C (72°F) | 51 mm | 43% | 27°C (80°F) | best |
| March | 28°C (82°F) | 23°C (73°F) | 38 mm | 38% | 27°C (81°F) | best |
| April | 29°C (85°F) | 24°C (75°F) | 41 mm | 37% | 27°C (81°F) | best |
| May | 30°C (86°F) | 25°C (77°F) | 92 mm | 44% | 28°C (82°F) | best |
| June | 30°C (85°F) | 26°C (79°F) | 181 mm | 59% | 29°C (83°F) | least pleasant |
| July | 30°C (86°F) | 26°C (79°F) | 89 mm | 50% | 29°C (84°F) | fair |
| August | 30°C (87°F) | 27°C (80°F) | 114 mm | 52% | 30°C (85°F) | fair |
| September | 30°C (85°F) | 26°C (79°F) | 166 mm | 58% | 30°C (85°F) | least pleasant |
| October | 29°C (83°F) | 25°C (78°F) | 224 mm | 58% | 29°C (85°F) | least pleasant |
| November | 27°C (81°F) | 24°C (74°F) | 124 mm | 53% | 29°C (83°F) | fair |
| December | 27°C (80°F) | 23°C (73°F) | 68 mm | 50% | 28°C (82°F) | best |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated . How we rate months