Weather in Saint Lucia in September
Country-wide climate normals across 15 cities in Saint Lucia.
How Hot Is Saint Lucia in September?
Saint Lucia bakes evenly in September — highs around 30°C are typical from Augier all the way to Canaries, with very little regional variation. Lows sit around 27°C even overnight, and the country's small geographic footprint means there are no significant climate pockets. Expect uniform heat day and night.
Sunshine in Saint Lucia in September
Dark, overcast days dominate Saint Lucia in September — Gros Islet sees just 1.2h of sun a day, and the pattern is similar across most regions. Cloud cover is heavy and persistent, with even the brighter regions struggling to escape the gloom for long.
Does It Rain In Saint Lucia In September?
Heavy rain shapes Saint Lucia's September: Gros Islet averages 142mm across 19 days, and most regions of the country see similar persistent wet conditions. Long sunny stretches are rare. Expect rain on roughly two out of every three days.
Is Saint Lucia Humid In September?
Mugginess defines Saint Lucia's September: humidity averages 75% in Gros Islet, and the air feels noticeably heavy across most regions. Sweat sits on the skin longer than it would in drier conditions, and overnight relief is limited. Pack light, breathable fabrics.
Wind In Saint Lucia In September
Breezy conditions cover Saint Lucia's September: Gros Islet sits at 22 kph on average, with the country as a whole feeling windy through the day. Afternoon winds pick up across most cities, and coastal regions often run significantly higher.
Cloud Cover In Saint Lucia In September
Heavy overcast covers Saint Lucia in September: 77% cloud cover in Gros Islet, with similar grey conditions in most regions. Direct sun is rare, and the pattern is persistent across the country. Coastal and northern regions feel especially heavy.