Similar Climates › City Pairings › Houston ≈ Porto Alegre
City Pairings
loose match
Houston, Texas and Porto Alegre, Brazil are a loose climate match — 8,126 km (5,049 mi) apart. Houston is Köppen zone Cfa; Porto Alegre is Cfa.
See Houston on the interactive map →Houston and Porto Alegre both sit in the humid subtropical (Cfa) zone, so their seasonal arcs line up. Because one city is in the opposite hemisphere, the comparison flips seasons: Houston’s January against Porto Alegre’s July. Roughly 8,126 km (5,049 mi) separates them — far enough that Porto Alegre feels like another continent, close enough on the climate numbers to stand in for Houston.
It is a loose match: useful as a climate analogue for Houston, though not a perfect copy. July by 4°C (Porto Alegre cooler); January means differ by 3°C (Porto Alegre warmer). Rainfall shifts more: Porto Alegre is 34 mm wetter in January, and 28 mm wetter in July.
Sunshine stays close: Porto Alegre at 9.1 h/day on average versus 9.0 h/day in Houston (January 7.1 h / 7 h, July 11 h / 11 h). PM2.5 averages stay near each other (10 µg/m³ in Porto Alegre, 14 in Houston). Humidity: dew point in Porto Alegre runs about 5°C higher in January (11°C vs 6°C), so the air feels muggier.
January & July · °C and mm
Porto Alegre is in the southern hemisphere, so its July lines up with Houston's January — the bars above pair each city's summer and winter, not the calendar month.
Compare Houston and Porto Alegre month by month on the interactive map →
See Porto Alegre's climate twin on its own page.
On Similar Climates, Porto Alegre, Brazil is the closest distant match for Houston, Texas — scored loose, about 8,126 km (5,049 mi) away.
Houston and Porto Alegre are separated by roughly 8,126 km (5,049 mi) on the great-circle route.
No — they sit in opposite hemispheres, so seasons run about six months apart: Porto Alegre’s July pairs with Houston’s January in the comparison.
Yes — both are humid subtropical (Cfa).
Houston has a humid subtropical climate (Cfa). January averages a high of 17°C and a low of 7°C with 91 mm of rain; July averages 35°C / 25°C and 107 mm.
Houston averages about 7 hours of sunshine a day in January and 11 hours in July.
January PM2.5 averages about 10.2 µg/m³ (US AQI 49); July averages 17.4 µg/m³ (US AQI 70).
Other close climate matches for Houston: Islamabad (loose), Asunción (loose), Shanghai (loose).
All humid subtropical (Cfa) cities on Similar Climates →
Explore Houston and Porto Alegre on the interactive map →