Weather in Porto Alegre in April

Prime time. If you get to pick your dates, April is the one. Highs average 25.9 °C, lows 15.9 °C, and rain falls on 11 days — nothing in the month is working against you.

April is the highest-scoring month of the twelve. The nearest rival is May, and the month at the other end of the year is January.

Rain on 11 days, 3 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: 4 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest April day reached 34.2 °C and the coldest night fell to 5.6 °C, and the wettest single day dropped 77 mm — roughly 79% of the month's rain in one day.

April is moderately variable: 25 mm in the driest year against 220 mm in the wettest, around an average of 98 mm. Roughly two Aprils in three land near that average, and the third does something else entirely.

Wind is light at 7.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 80%, high enough to notice on the warm days without dominating them.

How April sits in the year

The month is on the way down: 2.6 °C cooler than March, with May dropping another 4.3 °C. The first week and the last are not the same trip.

Daylight in April

11.4 hours of daylight, losing 0.8 hours across the month. That is between Porto Alegre's extremes of 14.1 and 10.2 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 23.2 °C in April — comfortable for a proper swim. The sea peaks at 25.3 °C in February and bottoms out at 16.5 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, September is the trade worth considering — 6 points weaker on weather, and materially quieter.

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

April in Porto Alegre versus nearby

If Porto Alegre is one option among several, the nearby comparison is worth making. Curitiba is close enough to be a coin toss — within a degree on temperature, 4 days more rain. São Paulo is close enough to be a coin toss — within a degree on temperature, 2 days more rain.

So: April is the answer for Porto Alegre. If it is booked out or priced out, May is the next best thing at 0 points behind, and January is the month to keep off the shortlist.

Every month in Porto Alegre

See all twelve months in Porto Alegre, or where else to go in April.