Guarulhos Weather in January

January: warm and very wet

January feels warm, sticky and cloudy in Guarulhos. Highs reach 27°C, and evenings stay mild, with lows around 19°C. Rain falls on 24 days, often as heavy showers, so a dry morning can turn wet by afternoon. The month gets 214 mm of rain, more than December or February.

You can still visit indoor sights or take a break at Bosque Maia when the weather clears. But muddy paths and sudden downpours make long outdoor plans less reliable. For a city visit, keep time flexible rather than tying a trip across town to a tight schedule.

Holidays and crowds

January 1 is Brazil's New Year's Day public holiday. It's also summer school-break time, so families are on the move and travel demand is generally higher than in the cooler, drier months from May to August. Guarulhos is home to São Paulo's main international airport, so holiday travel can make the airport busy.

For families, the school break can make travel easier, but the frequent rain may interrupt park outings. Prices can be higher than in quieter months, especially around the New Year holiday; compare dates if your plans allow.

Getting around in the rain

The weather is a poor fit for a packed outdoor sightseeing schedule. Save time for indoor stops, and leave extra room for airport journeys when rain is falling. A wet, cloudy day can also mean less sun than you might expect from a summer trip.

If you're using the CPTM Line 13-Jade train between Guarulhos airport and São Paulo, check the service before you go. Rain can slow road traffic too, so a taxi or bus ride may take longer than expected. For a calmer day between flights, Bosque Maia offers a green pause within Guarulhos; skip its paths if heavy rain has left them muddy.