Weather in Guyana Prancis in September
Country-wide climate normals across 15 cities in Guyana Prancis.
How Hot Is Guyana Prancis in September?
Guyana Prancis sees consistently hot September weather — average highs of 32°C, average lows of 24°C, with minimal regional differences. Whether you're in Cayenne or one of the coastal cities, conditions feel broadly the same: hot, generally clear, with little night-time relief.
Sunshine in Guyana Prancis in September
Dark, overcast days dominate Guyana Prancis in September — Cayenne sees just 1.1h 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 Guyana Prancis In September?
Moderate rainfall defines Guyana Prancis's September: Cayenne averages 97mm across 14 days. Some regions see meaningfully wetter weather, especially coastal or mountain-facing areas, while continental interiors tend toward the drier end of the spectrum.
Is Guyana Prancis Humid In September?
Saturated air defines Guyana Prancis's September: humidity at 77% in Cayenne, with the country as a whole feeling muggy and oppressive. The air practically drips after rain, and even shaded outdoor areas feel warm and clammy. Plan indoor time during the most humid afternoon hours.
Wind In Guyana Prancis In September
Guyana Prancis's September has gentle wind — Cayenne averages 13 kph, and the country tracks similarly. Outdoor activity is comfortable, and afternoon thermals add a pleasant breeze in inland areas.
Cloud Cover In Guyana Prancis In September
Heavy overcast covers Guyana Prancis in September: 79% cloud cover in Cayenne, 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.