SeasonMapCharlotte Amalie (St Thomas) weather in September
U.S. Virgin Islands
September in Charlotte Amalie: sweltering, rainy, with clean air — fine if you can take 36°C afternoons.
#10 of 12 months in Charlotte Amalie · #632 of 1383 destinations to visit in September · comfort 81/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Charlotte Amalie in September
Other months in Charlotte Amalie
Charlotte Amalie's forum puts March in the 80s°F with occasional showers that regulars describe as passing in about five to fifteen minutes rather than settling in. Regulars flag March as high season with more cruise ships in port and correspondingly higher rates, though crowding is generally manageable for land-based visitors.
Add your own note from Charlotte Amalie's card on the map.
Charlotte Amalie climate normals — September
| Daytime high | 32°C / 89°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 26°C / 80°F | |
| Feels like (high) | 36°C / 97°F | |
| Sea temperature | 30°C / 86°F | ♨️ bath-warm |
| Rainfall | 111 mm / 4.4 in | 🌧 rainy |
| Rainy days | 14 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 10.6 h/day | |
| Daylight | 12.2 h | |
| Wind | 27 km/h / 17 mph | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Charlotte Amalie in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Quietschool holidays in 2 of the markets that fill it, one of its worst months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Charlotte Amalie's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherCharlotte Amalie's weather doesn't swing hard through the year — comfort stays fairly steady in every month.
What's on in Charlotte Amalie in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Hazard
Hurricane season
1 Jun – 30 NovIrma and Maria crossed the territory two weeks apart in September 2017 and the islands still plan around that fortnight. Small hotels and charter boats close for September outright. Source ↗
Nearby, and something's on
Within 300 km of Charlotte Amalie — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Charlotte Amalie?
Charlotte Amalie in September — FAQ
- Is September a good time to visit Charlotte Amalie?
- September in Charlotte Amalie: sweltering, rainy, with clean air — fine if you can take 36°C afternoons. It ranks #10 of 12 months for Charlotte Amalie on SeasonMap's comfort score (81/100).
- What is the weather like in Charlotte Amalie in September?
- In September, Charlotte Amalie averages a daily high of 31.7°C and a low of 26.4°C, with about 111.4 mm of rain over roughly 13.6 rainy days.
- What is the air quality in Charlotte Amalie in September?
- Charlotte Amalie has a mean US Air Quality Index of about 34 in September.
Other months in Charlotte Amalie
Compare Charlotte Amalie in September
Warmer or cooler than Charlotte Amalie in September
Similar destinations in Caribbean — September
Within 300 km: San Juan's Bioluminescent bay nights on 1 Jan – 31 Dec, and Philipsburg's Sea turtle nesting around 1 Apr – 30 Nov.