Weather in St. Martin in September
Country-wide climate normals across 13 cities in St. Martin.
How Hot Is St. Martin in September?
Uniform heat across St. Martin's September: averages climb to 28°C nationally with overnight lows of 27°C, narrow spread from coast to interior. The hottest cities like Les Terres Basses register similar readings to the coolest, so plan for consistently hot weather across the country.
Sunshine in St. Martin in September
Dark, overcast days dominate St. Martin in September — Marigot sees just 1.8h 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 St. Martin In September?
Heavy rain shapes St. Martin's September: Marigot averages 142mm across 16 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 St. Martin Humid In September?
St. Martin is enveloped in tropical-thick humidity through September: Marigot averages 76%, and most of the country tracks similarly. The constant moisture makes warm temperatures feel substantially hotter, and even nights bring limited cooling. Light cotton clothing is essential.
Wind In St. Martin In September
St. Martin sees consistent breezes in September — averaging 27 kph in Marigot, with similar windy conditions across most regions. Coastal and exposed inland cities often see considerably more, especially in the afternoons. Wind-sensitive plans should factor this in.
Cloud Cover In St. Martin In September
St. Martin sees mostly cloudy weather through September: Marigot averages 73% cloud cover, and the pattern repeats across the country. Bright sun is uncommon; expect a grey, soft-lit feel to most days.