The month in detail
What to expect in September
In September, Saint Lucia sees 86°F during the day with 8.0h of sunshine per day. Expect rain on 34% of days — a light raincoat in the bag is recommended. Not the best window, but acceptable if dates are constrained. March (8.7/10) is significantly better if possible.
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 (8.7/10), 3.2 pts higher than September.
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 →
Activities
Tours, tickets, experiences
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Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Saint Lucia
GetYourGuide selection · free cancellation
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 · 37%
🏝️ 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
BarbadosBarbados
DominicaDominica
Saint VincentSaint Vincent and the Grenadines
AntiguaAntigua and Barbuda
Saint ThomasUS Virgin Islands
Location
Where is Saint Lucia ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
Saint LuciaTropical climate with a 8.7 → 5.5 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 19.0% 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 8.3/10.
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 8.1/10 on average — Acceptable conditions for cultural visits.. The best month overall remains March with a score of 8.3/10.
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.