Hot
Average highs reach 32°C, so days can feel very hot.
September verdict
Grand Cayman, Cayman Islands in September
Weather score58Good
Good for holiday weather
Average highs reach 32°C, so days can feel very hot. Sunshine averages 7.5h per day, enough for a balanced month. Rainfall averages 208mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
32°C
Rain
208mm
Sun
7.5h
Sea
30°C
Weather score
58
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 208mm, so showers are a real planning factor.
Some sun
Sunshine averages 7.5h per day, enough for a balanced month.
Warm sea
Sea temperatures average 30°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Grand Cayman, Cayman Islands with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September32°C average high
September is one of Grand Cayman's warmest months, with daytime heat above the yearly average.
Warmest monthsMay to October
This stretch sets the upper range for average daytime heat.
Rain
September208mm average rain
September is wetter than Grand Cayman's yearly average, so flexible plans matter more.
Driest monthsJanuary to April and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September7.5 hours average sun
September is below Grand Cayman's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsMarch to April and July
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September30°C average sea
September is one of Grand Cayman's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJune to October
Sea temperatures are usually near 29°C in this stretch, so swimming comfort is at its strongest.
Weather score
September58 weather score
September is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJanuary to April and December
These months have the strongest weather score in the monthly averages.
