Belém is warmest in September, averaging 34° by day and 25° at night. The wettest month is March with 434 mm, and the year brings about 2777 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 29° | 24° | 322 mm | 29° | 12.1 h | Rainy season |
| February | 29° | 24° | 353 mm | 29° | 12.0 h | Rainy season |
| March | 28° | 25° | 434 mm | 28° | 12.0 h | Rainy season |
| April | 29° | 25° | 360 mm | 29° | 12.0 h | Rainy season |
| May | 29° | 25° | 341 mm | 29° | 11.9 h | Rainy season |
| June | 29° | 24° | 192 mm | 29° | 11.9 h | Rainy season |
| July | 30° | 24° | 102 mm | 29° | 11.9 h | Beach weather |
| August | 32° | 24° | 81 mm | 29° | 12.0 h | Beach weather |
| September | 34° | 25° | 99 mm | 29° | 12.0 h | Beach weather |
| October | 34° | 25° | 93 mm | 29° | 12.0 h | Beach weather |
| November | 32° | 25° | 186 mm | 29° | 12.1 h | Rainy season |
| December | 30° | 25° | 214 mm | 29° | 12.1 h | Rainy season |
High and low are average daily maximum and minimum, rain is typical monthly total, sea is the average surface temperature, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER and NOAA MUR — averages, not promises.
When to go
Beach weather: July, August, September and October — highs around 32°, nights no colder than 24°, and at most 102 mm of rain in a month. The sea sits at 29–29° then.
Wet season: January, February, March, April, May, June, November and December — up to 434 mm in a single month.