Saint Thomas weather in September [2026]

Month summary

Saint Thomas weather in September

✅ Good

🌡️ Temperature min / max

81°F – 84°F

🌧 Rainy days

55% of days

☀️ Sunshine

10.9h per day on average

🌊 🌊 Season

Autumn

⭐ ⭐ Weather score

7.9/10

📅 📅 Best month

March (8.8/10)

Quick decision

Should you visit Saint Thomas in September?

✅ Good

✅ Yes if: you're willing to accept showers in exchange for lower prices and fewer tourists.

❌ No if: you're planning 100% outdoor activities — rain is frequent.

🌧 Rain : ██████░░░░ 55%

🌡 Temperature : ███████░░░ 84°F

☀️ Sunshine : ████████░░ 10.9h/d

Our take: September in Saint Thomas is hot and humid with temperatures hovering around 27-29°C, so pack light, breathable clothes and sunscreen. You'll catch plenty of sunshine (over 5 hours daily), but afternoon showers are frequent—bring a compact umbrella or rain jacket. It's perfect for travelers who love warm weather and don't mind tropical downpours, plus you'll enjoy fewer crowds and great hotel deals.

By trip type

Saint Thomas in September by trip type

🏙️ 🏙️ City break / culture : ✅ Good
🚶 🚶 Outdoor activities : ✅ Good
🏖️ Beach / swimming : ✅ Good
💰 💰 Budget : ✅ Low season

Local context

What to expect in September

Autumn in Saint Thomas is often underrated: 29°F, golden light and declining crowds. An interesting window. With 55% of rainy days, always have indoor alternatives planned. A good balance between weather and crowds, even if March (8.8/10) remains theoretically better.

Browse by month

All months for Saint Thomas

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Annual table

Month-by-month comparison

Month	Min °F	Max °F	Rain %	Precip in	Sun h/d	Score
🌤️ January	77°F	79°F	31%	1.2in	10.6h	8.6/10
🌤️ February	75°F	79°F	37%	1.4in	11.7h	8.4/10
🌤️ March	75°F	79°F	25%	1.0in	10.8h	8.8/10
🌤️ April	77°F	79°F	29%	1.6in	11.8h	8.7/10
🌤️ May	79°F	81°F	33%	2.3in	11.4h	8.7/10
🌤️ June	79°F	82°F	35%	1.7in	12.3h	8.7/10
🌤️ July	81°F	82°F	43%	3.0in	11.6h	8.4/10
🌤️ August	81°F	82°F	52%	3.9in	11.1h	8.2/10
🌤️ September	81°F	84°F	55%	5.3in	10.9h	7.9/10
🌤️ October	81°F	82°F	56%	4.9in	10.2h	8.0/10
🌤️ November	79°F	82°F	54%	5.1in	9.9h	8.1/10
🌤️ December	79°F	81°F	37%	1.5in	10.3h	8.5/10

Ideal Fair Challenging climate ◀ Current month · Source Open-Meteo · 10 years

📊 Data source Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Saint Thomas averages 84°F, 55% rainy days and 10.9h of sunshine per day. Overall weather score: 7.9/10. See methodology →

Comparison