Weather in Curitiba in May

A good month. May works. It is not the peak, but nothing about it fights you. Highs average 20.5 °C, lows 11.2 °C, and rain falls on 13 days — nothing in the month is working against you.

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

Rain on 13 days, 4 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 29.2 °C and the coldest night fell to -1.4 °C, and the wettest single day dropped 63 mm — roughly 61% of the month's rain in one day.

May is moderately variable: 20 mm in the driest year against 254 mm in the wettest, around an average of 104 mm. Roughly two Mays in three land near that average, and the third does something else entirely.

Wind is light at 3.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 85%, high enough to notice on the warm days without dominating them.

How May sits in the year

Temperatures hold steady either side: 24.1 °C in April, 20.5 here, 19.2 in June. Nothing about the timing within the month matters much.

Daylight in May

May sits at the dark end of Curitiba's year — 10.9 hours of daylight against 13.7 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: 17.3 °C between the year's warmest afternoons and coldest nights. At 924 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

Shoulder. The value months — prices ease off and you get the place closer to itself.

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

May in Curitiba versus nearby

If Curitiba is one option among several, the nearby comparison is worth making. São Paulo is close enough to be a coin toss — 2.3 °C warmer, 3 days less rain. Porto Alegre is close enough to be a coin toss — within a degree on temperature, 2 days less rain.

So: May works, with August the better month by 9 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Curitiba

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