Weather in Belém in May

A hard month. May is a hard month in Belém, and worth planning around. You should expect rain on 30 days of the month, which is more days wet than dry.

Belém barely has seasons. May scores 48 out of 100 against a best of 49 in February — a gap small enough that the month you choose matters far less here than the week you choose.

Rain on 30 of the month's 31 days, 10 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Natural fibres and a second shirt for the day. At 92% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 3.8 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest May day reached 30.4 °C and the coldest night fell to 22.4 °C, and the wettest single day dropped 52 mm — roughly 19% of the month's rain in one day.

May is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest May on record still delivered 404 mm against 154 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 275 mm average is a reasonable planning figure, not a promise.

Wind is light at 2.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity at 92% is the real story though — it is the number that decides how the day feels, not the 28.4 °C.

How May sits in the year

Temperatures hold steady either side: 28.1 °C in April, 28.4 here, 28.7 in June. Nothing about the timing within the month matters much. Rain is the thing that moves: June brings 5 days less of it, so pushing the dates later buys drier weather.

Daylight in May

Belém sits close enough to the equator that daylight barely moves all year — 12.1 hours in May, against a range of just 0.2 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

An inland climate

Despite being inland, the year stays fairly even: 9.7 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

May in Belém versus nearby

If Belém is one option among several, the nearby comparison is worth making. Fortaleza is close enough to be a coin toss — within a degree on temperature, 8 days less rain. Manaus is close enough to be a coin toss — within a degree on temperature, 4 days less rain.

So: May is effectively as good as it gets here — 1 points behind February, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Belém

See all twelve months in Belém, or where else to go in May.