Weather in São Paulo in May

Prime time. May is about as good as São Paulo gets. Highs average 22.8 °C, lows 13 °C, and rain falls on 10 days — nothing in the month is working against you.

May ranks 4 of 12 in São Paulo: past the worst of the year but short of August, which is the month to book if the dates are open.

Rain on 10 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average May reaches 30 °C. Across the twenty years measured, the hottest May day reached 30.4 °C and the coldest night fell to 5.2 °C, and the wettest single day dropped 105 mm — roughly 157% of the month's rain in one day.

May is moderately variable: 13 mm in the driest year against 149 mm in the wettest, around an average of 67 mm. Roughly two Mays in three land near that average, and the third does something else entirely.

Wind is light at 7.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 84%, high enough to notice on the warm days without dominating them.

How May sits in the year

Temperatures hold steady either side: 25.4 °C in April, 22.8 here, 22.3 in June. Nothing about the timing within the month matters much.

Daylight in May

May sits at the dark end of São Paulo's year — 11 hours of daylight against 13.6 at midsummer, losing 0.5 hours across the month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

An inland climate

Despite being inland, the year stays fairly even: 16.8 °C between the year's warmest afternoons and coldest nights. At 769 m the air is thin enough to matter — sun that burns faster than the temperature suggests, and nights that cool off quickly.

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 São Paulo versus nearby

If São Paulo is one option among several, the nearby comparison is worth making. Curitiba is close enough to be a coin toss — 2.3 °C cooler, 3 days more rain. Rio de Janeiro is close enough to be a coin toss — 2.8 °C warmer, the same number of rain days.

So: May is effectively as good as it gets here — 6 points behind August, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in São Paulo

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