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Saint Lucia, Saint Lucia · Tropical

Saint Lucia in September: go or not?

Mixed period. Saint Lucia in September: 4.9/10.

📅 Updated August 2026 🛰️ ERA5 · 10 years 📍 13.91°N · 60.98°W
⚡ This month's verdict
Why not
Saint Lucia · September
4.9
24–30°
Temperature
69%
Rain
8h
Sun
🌴 Tropical☀️ High UV🌧️ Monsoon season
Photo : Germine Sealy via Unsplash
The month in detail

What to expect in September

September falls in the wet season in Saint Lucia. Showers are often brief but intense. With 69.0% of rainy days, always have indoor alternatives planned.

September ranks 12 out of 12 months in Saint Lucia. Compared to August: +2°F daytime.

This month's conditions

What it's like in September

UV index
9 · very high
protection essential
Feels like
very humid
22°
Sea
30°C
warm, ideal
Daylight
12.1h of daylight
Air quality
excellent
AQI 18
Compare

Is September the right month?

The best month in Saint Lucia is March (8.1/10), 3.2 pts higher than September.

See March →See all 12 months →
Context

Our verdict

Saint Lucia is a volcanic island in the Eastern Caribbean: 230 sq miles, 180,000 inhabitants, traditionally Francophone (creole influenced by French despite British independence in 1979). Marked by the Pitons (UNESCO, 2 conical peaks of 2,300 ft and 2,600 ft).

Read Gilles' full review →

Book

Plan your trip

Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.

🏨
Stay
Hotels & rentals · Saint Lucia
Expedia →
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Activities
Tours, tickets, experiences
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Flights
Multi-airline comparator
Kiwi →

🎟️ Activities & tours · Saint Lucia

GetYourGuide selection · free cancellation

See all →
Affiliate link · GetYourGuide
Practical info

What you need to know before you go

Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a tropical stay.

Country · Saint Lucia

🗣️LanguageEnglish
💶CurrencyEast Caribbean Dollar ($)
🚗DrivingLeft-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘModerate · 3/5

🌡️ Climate

🌍Climate typeTropical
📈Climate trend ⓘStable
🔥Hottest monthSeptember · 86°F
❄️Coolest monthJanuary · 81°F
🌧️Rainiest month ⓘJuly · 73%

🏝️ Tropical stay

🌞Dry season ⓘMay → Sep
🌧️Wet season ⓘDec → Mar
🌀Cyclones ⓘSeason Nov-Apr
Explore

Other destinations in September

If September doesn't convince you for this destination, compare with others.

Similar climate
BarbadosBarbadosMartiniqueMartiniqueSaint VincentSaint Vincent and the GrenadinesSt. George'sGrenadaDominicaDominica
Nearby
GrenadinesSaint Vincent and the Grenadines104 kmDominicaDominica172 kmGuadeloupeGuadeloupe267 kmTrinidad and TobagoTrinidad and Tobago367 km
Other top picks
Cape VerdeCape Verde5.3SalCape Verde5.6Marsa AlamEgypt5.8Sharm el-SheikhEgypt5.8HurghadaEgypt5.9
← AugustOctober →
🗺️ See all 754 destinations on the map
Location

Where is Saint Lucia ?

Global position + regional geographic context.

🌍 World
🔍 Geographic context
Saint Lucia
Tropical climate with a 8.1 → 4.9 gap between best and worst month. 10 years of ERA5 data to choose by project.
13.91°N · 60.98°W
Questions

Frequently asked questions

What is the best time to visit Saint Lucia?
March is the best month with 82°F highs, 72°F lows, 8.0h of sunshine and 46.0% rainy days. The months of March & April offer comparable conditions.
How many hours of sunshine does Saint Lucia get in March?
Saint Lucia averages 8.0 sunshine hours per day in March. It is the sunniest month with a climate score of 7.6/10.
What is the rainiest month in Saint Lucia?
September is the most unfavourable month with September has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Saint Lucia in March?
In March, overnight lows reach 72°F, while afternoon highs average 82°F.
Is Saint Lucia good in winter?
In winter (December-February), Saint Lucia scores 7.4/10 on average — Acceptable conditions for cultural visits.. The best month overall remains March with a score of 7.6/10.
When should you avoid Saint Lucia?
September is the most difficult month to visit Saint Lucia, with September has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Saint Lucia in September?
In September, the sea averages 87°F in Saint Lucia: warm, ideal. Ideal conditions for swimming and snorkeling.
Do you need sun protection in Saint Lucia in September?
The average UV index reaches 9 in September in Saint Lucia (very high), with about 12.1h of daylight. Protection essential.