Climate Chart of St. Thomas, Virgin Islands (U.S.)

Climate overview

Temperature

Monthly mean temperature reaches its supplied high in September, at 27.8 °C. This is the warmest monthly mean in the record, not a typical daytime maximum, so it should not be read as the hottest temperature visitors may encounter. The coolest monthly means occur in February / March, at 25.0 °C. For travellers who prefer cooler average conditions, these months are the relevant options in the temperature data; the monthly figures cannot guarantee a particular day's feel. Across the calendar-month means, the unweighted mean is 26.4 °C. It provides a concise overview of the year, but is not a day-weighted annual average.

Rain

Mean daily rainfall is highest in September, at 4.46 mm/day. This is a daily average rather than a monthly accumulation, so it is useful for considering rain preparation but does not describe the amount on any specific day. The lowest monthly mean for daily rainfall is in March, at 0.87 mm/day. Visitors prioritising lower average rainfall could consider this as a conditional option, while keeping in mind that a lower mean neither guarantees dry days nor indicates how frequently rain occurs. The unweighted mean across the calendar-month daily rainfall means is 2.35 mm/day. It gives an overall reference point, not a monthly total or a measure of rain frequency.

Sunshine

Mean daily sunshine duration is highest in June, at 11.76 hours/day. For outdoor plans that depend on sunshine, this is the strongest month in the supplied averages, though the figure does not promise clear conditions on each day. The lowest mean daily sunshine duration occurs in November, at 9.50 hours/day. This can help set expectations for outdoor sightseeing, but sunshine duration is not the same as day length. The unweighted mean of the calendar-month sunshine means is 10.74 hours/day per day. Treat it as a broad planning reference rather than a guarantee of the sunshine available during a particular visit.