Weather in Portoriko in september
Country-wide climate normals across 15 cities in Portoriko.
How Hot Is Portoriko in september?
Portoriko 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 Portoriko in september
Dark, overcast days dominate Portoriko in September — San Juan sees just 1.0h 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 Portoriko In september?
Heavy seasonal rains saturate Portoriko 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 Portoriko Humid In september?
Saturated air defines Portoriko'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 Portoriko In september
Light breezes are typical across Portoriko in September: 18 kph in San Juan, with similar gentle wind conditions in most regions. The air moves enough to keep things fresh on warm days but not enough to be disruptive. Coastal cities may see slightly more.
Cloud Cover In Portoriko In september
Portoriko'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.