SeasonMapSaint Lucia in September
September is Saint Lucia's 9th-best month (rank 9 of 12): its 2 destinations average 85/100, led by Castries at 86 — 35°C and 19 rainy days — while Soufrière trails at 84 with 98 mm of rain.
#9 of 12 months for Saint Lucia · 2 destinations · updated September 2026 · climate normals from ERA5 reanalysis
Where in Saint Lucia in September
| # | Place | Type | Feels-like high | Rain | Comfort | At its best |
|---|---|---|---|---|---|---|
| 1 | Castries | Island | 35°C | 88 mm · 19 days | 86 tier A | — |
| 2 | Soufrière | Beach | 35°C | 98 mm · 19 days | 84 tier A | — |
Comfort is SeasonMap's 0–100 score; each place is judged through the lens that suits it — beaches on beach weather, ski resorts on snow. "At its best" means September is one of that place's own top three months. Feels-like highs fold in humidity, wind and sun.
What's on in Saint Lucia in September
- La Rose flower festival · Soufrière · 28 Aug – 1 Sep
Seasons in force
Peak crowds at 1 of Saint Lucia's 1 well-known places this month.