Warm
Average highs sit around 31°C, giving warm days by monthly-average standards.
September verdict
St Thomas, Virgin Islands (US) in September
Weather score64Good
Good for holiday weather
Average highs sit around 31°C, giving warm days by monthly-average standards. Sunshine averages 7.7h per day, enough for a balanced month. Rainfall averages 143mm, so some wet days are possible.
September weather
Monthly averages
Temp
31°C
Rain
143mm
Sun
7.7h
Sea
29°C
Weather score
64
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 143mm, so some wet days are possible.
Some sun
Sunshine averages 7.7h 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 St Thomas, Virgin Islands (US) with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September31°C average high
September is one of St Thomas' warmest months, with daytime heat above the yearly average.
Warmest monthsMay to November
This stretch sets the upper range for average daytime heat.
Rain
September143mm average rain
September is wetter than St Thomas' yearly average, so flexible plans matter more.
Driest monthsJanuary to April and June to July
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September7.7 hours average sun
September sits close to St Thomas' yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsFebruary to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September29°C average sea
September is one of St Thomas' warmest sea months, when swimming comfort is usually strongest.
Warmest seaJune to November
Sea temperatures are usually near 28°C in this stretch, so swimming comfort is at its strongest.
Weather score
September64 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 June
These months have the strongest weather score in the monthly averages.
