Weather in Guarulhos

Guarulhos is in Brazil at 23.5°S. The 2001–2020 NASA POWER daily record describes a monsoon climate with a sharp wet-dry split. February is the warmest month (average 23.4°C, high 27.7°C) and July is the coolest (average 17.4°C, low 12.0°C).

Rain is the monsoon runs from October to April, inside an annual total of 1379 mm. The wettest month is January at 228 mm; the driest is August at 37 mm. On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are August, October, and November.

Temperature through the year

Monthly average highs run from 22.8°C in July to 27.7°C in February. Nights follow the same curve: 12.0°C in July and 19.1°C in February.

Mean high across all twelve months is 25.8°C and mean low is 15.9°C. These are 20-year grid averages, so a city station can read a few degrees warmer or cooler.

Rainfall pattern

The monsoon in Guarulhos starts in October and ends in April (October, November, December, January, February, March, and April). January is the core of it at 228 mm. August is the other extreme, with 37 mm.

A rainy day here is a day with at least 1 mm in the NASA POWER series. January averages 25 such days; August averages 7.

Distinctive months in Guarulhos

January is the wettest month — 228 mm and 25 rainy days, with 83% humidity. Peak heat arrives in February: 27.7°C by day, 19.1°C at night, and 83% humidity. By April the monsoon is ending. Guarulhos still sees about 91 mm, but the next month is usually leaner.

July is the coolest month, with lows around 12.0°C and highs near 22.8°C. Rainfall is 62 mm. August is the driest month, averaging only 37 mm across 7 rainy days. Highs sit near 24.7°C.

Best months to visit Guarulhos

The three months with the highest comfort score are August, October, and November: August (18.7°C average, 37 mm, 75% humidity); October (21.9°C average, 106 mm, 77% humidity); November (21.9°C average, 151 mm, 80% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the monsoon itself — fewer crowds, greener landscape, heavier rain — aim at October–April instead of the score.

How Guarulhos compares inside Brazil

São Paulo is about 14 km away: Guarulhos is 0.5°C warmer than São Paulo in its hottest month and a similar annual rainfall (1352 mm in São Paulo). São Paulo’s wettest month is January (230 mm) versus January here.

Rio de Janeiro is about 348 km away: Guarulhos is 2.8°C cooler than Rio de Janeiro in its hottest month and 90 mm drier over the year than Rio de Janeiro. Rio de Janeiro’s wettest month is December (232 mm) versus January here.

Curitiba is about 353 km away: Guarulhos is 1.4°C warmer than Curitiba in its hottest month and 251 mm drier over the year than Curitiba. Curitiba’s wettest month is January (221 mm) versus January here.