Guarulhos is warmest in September, averaging 30° by day and 15° at night. The wettest month is February with 179 mm, and the year brings about 1140 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | 28° | 20° | 177 mm | 13.3 h | Mild |
| February | 28° | 19° | 179 mm | 12.8 h | Rainy season |
| March | 28° | 19° | 130 mm | 12.2 h | Mild |
| April | 26° | 17° | 48 mm | 11.4 h | Beach weather |
| May | 25° | 14° | 43 mm | 10.9 h | Beach weather |
| June | 24° | 13° | 39 mm | 10.6 h | Sightseeing |
| July | 25° | 12° | 22 mm | 10.7 h | Sightseeing |
| August | 26° | 13° | 43 mm | 11.2 h | Beach weather |
| September | 30° | 15° | 51 mm | 11.9 h | Beach weather |
| October | 28° | 17° | 136 mm | 12.6 h | Mild |
| November | 28° | 17° | 111 mm | 13.2 h | Mild |
| December | 29° | 19° | 161 mm | 13.4 h | Mild |
High and low are average daily maximum and minimum, rain is typical monthly total, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER — averages, not promises.
When to go
Beach weather: April, May, August and September — highs around 27°, nights no colder than 13°, and at most 51 mm of rain in a month.
Walking the city: June and July — highs of 24–25° and no more than 39 mm of rain a month.
Wet season: February — up to 179 mm in a single month.