Weather in Puerto Riko in September
Country-wide climate normals across 15 cities in Puerto Riko.
How Hot Is Puerto Riko in September?
Puerto Riko bakes evenly in September — highs around 31°C are typical from Fajardo all the way to Guaynabo, with very little regional variation. Lows sit around 25°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 Puerto Riko in September
Persistent cloud and grey skies define Puerto Riko's September: about 1.0h of sun a day in San Juan. Daylight is in short supply too, running from 6:10 am to 6:25 pm, and most regions of the country see similar overcast conditions. Bright stretches are uncommon and brief.
Does It Rain In Puerto Riko In September?
Heavy seasonal rains saturate Puerto Riko in September — San Juan averages 208mm of rain across 23 days, with downpours an almost daily feature. The pattern is consistent across most regions, particularly along monsoon-affected coasts. Expect torrential afternoon storms followed by humid heat.
Is Puerto Riko Humid In September?
Saturated air defines Puerto Riko's September: humidity at 78% in San Juan, 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 Puerto Riko In September
Gentle steady winds define Puerto Riko's September: San Juan averages 18 kph, with conditions consistent across most regions. The breeze keeps warm days bearable without being a nuisance.
Cloud Cover In Puerto Riko In September
Puerto Riko's September is dominated by overcast skies: San Juan averages 78% cloud cover, with similar grey persistence across the country. Days feel dim and soft-lit, with little break in the cloud deck.