Saint Lucia in September

September is one of Saint Lucia's weaker months (rank 11 of 12): its 2 destinations average 82/100, led by Castries at 83 — 37°C and 19 rainy days — while Soufrière trails at 81 with 129 mm of rain.

#11 of 12 months for Saint Lucia · 2 destinations · updated September 2026 · climate normals from ERA5 reanalysis

🇱🇨 Saint Lucia, month by month

82/100 in September
  1. 90Jan
  2. 91Feb
  3. 92Mar
  4. 91Apr
  5. 90May
  6. 86Jun
  7. 84Jul
  8. 83Aug
  9. 82Sep
  10. 82Oct
  11. 83Nov
  12. 89Dec

Where in Saint Lucia in September

#PlaceTypeFeels-like highRainComfortAt its best
1CastriesIsland37°C115 mm · 19 days83 tier A—
2SoufrièreBeach37°C129 mm · 19 days81 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

Peak crowds at 1 of Saint Lucia's 1 well-known places this month.

Better months for Saint Lucia

March · 92/100February · 91/100April · 91/100Weakest: October · 82/100
← Saint Lucia in AugustSaint Lucia in October →Best time to visit Saint Lucia, month by monthCompare: Castries vs Soufrière in September