Similar Climates › City Pairings › Colombo ≈ San Juan
City Pairings
fair match
Colombo, Sri Lanka and San Juan, Puerto Rico are a fair climate match — 15,333 km (9,527 mi) apart. Colombo is Köppen zone Af; San Juan is Af.
See Colombo on the interactive map →Colombo and San Juan both sit in the tropical rainforest (Af) zone, so their seasonal arcs line up. They are about 15,333 km (9,527 mi) apart, nearly opposite on the globe, yet San Juan still tracks Colombo’s January and July.
It is a fair match — close on the main numbers, with a few seasonal quirks between Colombo and San Juan. Temperatures stay tight: January means differ by 2°C (San Juan cooler); July by 0°C (San Juan cooler).
Sunshine: San Juan averages 11.4 hours a day across the two months vs 10.2 in Colombo (1.2 h/day more; January 10.8 h vs 10.5 h, July 12 h vs 9.8 h). Air quality: mean PM2.5 is 10 µg/m³ in San Juan vs 23 in Colombo (lower by 13 µg/m³).
January & July · °C and mm
Compare Colombo and San Juan month by month on the interactive map →
See San Juan's climate twin on its own page.
On Similar Climates, San Juan, Puerto Rico is the closest distant match for Colombo, Sri Lanka — scored fair, about 15,333 km (9,527 mi) away.
Colombo and San Juan are separated by roughly 15,333 km (9,527 mi) on the great-circle route.
Yes — both cities are in the same hemisphere, so summer and winter fall in the same calendar months.
Yes — both are tropical rainforest (Af).
Colombo has a tropical rainforest climate (Af). January averages a high of 31°C and a low of 22°C with 75 mm of rain; July averages 30°C / 26°C and 135 mm.
Colombo averages about 10.5 hours of sunshine a day in January and 9.8 hours in July.
January PM2.5 averages about 31.1 µg/m³ (US AQI 98); July averages 14.6 µg/m³ (US AQI 60).
Other close climate matches for Colombo: Miami (fair), Nuku'alofa (loose), Rio de Janeiro (loose).
All tropical rainforest (Af) cities on Similar Climates →
Explore Colombo and San Juan on the interactive map →