Warm
Average highs sit around 30°C, giving warm days by monthly-average standards.
September verdict
Saint Lucia in September
Weather score58Good
Good for holiday weather
Average highs sit around 30°C, giving warm days by monthly-average standards. Sunshine averages 7.4h per day, enough for a balanced month. Rainfall averages 224mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
30°C
Rain
224mm
Sun
7.4h
Sea
29°C
Weather score
58
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 224mm, so showers are a real planning factor.
Some sun
Sunshine averages 7.4h per day, enough for a balanced month.
Warm sea
Sea temperatures average 29°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Saint Lucia with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September30°C average high
September is close to Saint Lucia's usual daytime heat, with little temperature swing across the year.
Warmest monthsAll year
Daytime heat stays consistently warm through the year.
Rain
September224mm average rain
September is wetter than Saint Lucia's yearly average, so flexible plans matter more.
Driest monthsJanuary to May
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September7.4 hours average sun
September is close to Saint Lucia's usual sunshine level, with limited seasonal swing across the year.
Brightest monthsAll year
Sunshine stays consistently strong through the year.
Sea temperature
September29°C average sea
September is one of Saint Lucia's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to November
Sea temperatures are usually near 28°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
These months have the strongest weather score in the monthly averages.
