Temperature
Hot by day, warm at night.
86°Ftypical September high
Typical range
September climate
September in St. Lucia
Saint Lucia · Caribbean
Hot days and some sun. Hurricane risk near peak and humid air are the main drawbacks.
Some tradeoffs
Daytime high
86°F
Lows around 78°F
Rain
Rain most days
Sun
11 h/day
Air feel
Very humid
Sea temp
85°F
Great for swimming
When to visit
Month-by-month fit
Best
Precipitation
It rains on most days, with a mix of brief and longer spells. About 19 wet days, more than in most months.
63%wet-day frequency
AmountWet-day chance
Sunshine
Cloudier spells limit sunshine.
11.1 hSeptember sunshine
Heat & humidity by month
Very humid air is a major factor this month.
77%September Heat feel
Easy airWarm airHumid airVery humid air
Hourly temperature pattern
In September, afternoons feel about 89° and nights feel near 84°.
ComfortableWarmHotNight hours
Clear sky
Mostly cloudy skies this month.
39%September Clear sky
Clear skyCloud
Wind pattern
September's typical breeze keeps the air from feeling as stagnant.
10 mphSeptember Breezy
Sea temperature
85°FSeptember sea temp
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 84°F, easing to about 81°F in early evening.
Avg temp Typical range
Morning84°F
Feels 87°F
Rain41%
Cloud60%
Humid airVery high
Sun intensityModerate
Midday85°F
Feels 89°F
Rain48%
Cloud65%
Humid airVery high
Sun intensityStrong
Late afternoon84°F
Feels 88°F
Rain45%
Cloud66%
Humid airVery high
Sun intensityModerate
Early evening81°F
Feels 86°F
Rain24%
Cloud61%
Humid airVery high
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 82 | 75 | 1.4 | 13 | 10.8 | 74 | 81 |
| Feb | 82 | 75 | 0.9 | 10 | 11.1 | 71 | 80 |
| Mar | 83 | 75 | 1.1 | 11 | 11.6 | 71 | 80 |
| Apr | 84 | 76 | 1.5 | 12 | 11.8 | 73 | 81 |
| May | 85 | 78 | 1.7 | 13 | 11.7 | 74 | 82 |
| Jun | 85 | 78 | 2.8 | 16 | 11.5 | 76 | 83 |
| Jul | 85 | 78 | 3.6 | 21 | 11.6 | 78 | 83 |
| Aug | 85 | 78 | 4.1 | 22 | 11.4 | 79 | 84 |
| Sep | 86 | 78 | 4.0 | 19 | 11.1 | 78 | 85 |
| Oct | 85 | 78 | 4.9 | 21 | 10.7 | 79 | 85 |
| Nov | 84 | 77 | 4.0 | 19 | 10.6 | 79 | 84 |
| Dec | 83 | 76 | 1.7 | 14 | 10.7 | 75 | 82 |
Similar climates
Similar
Similar travel styleDominicaDominicaSimilar travel styleSt. JohnUS Virgin IslandsSimilar travel styleBaliIndonesiaSimilar travel styleRaa AtollMaldives
Want a side-by-side climate view? Compare St. Lucia with Dominica.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 1, 2026
Data & methodology