Weather in Porto Alegre in January

Shoulder season. January sits in between. You will get good days and you will lose some. You should expect rain on 15 days of the month, which is more days wet than dry.

January ranks 12 of 12 — near the bottom of Porto Alegre's year. April is the month that works, and the swing between the two is 18 points, which is a different holiday rather than a slightly better one.

Rain on 15 days, 4 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 29.4 °C days and 19.8 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 12 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest January day reached 39.3 °C and the coldest night fell to 13.1 °C, and the wettest single day dropped 44 mm — roughly 37% of the month's rain in one day.

January is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest January on record still delivered 201 mm against 57 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 120 mm average is a reasonable planning figure, not a promise.

Wind is light at 8.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 78%, high enough to notice on the warm days without dominating them.

How January sits in the year

Temperatures hold steady either side: 28.2 °C in December, 29.4 here, 29.8 in February. Nothing about the timing within the month matters much.

Daylight in January

January is at or near the longest days of Porto Alegre's year: 13.9 hours of daylight, losing 0.5 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 24.7 °C in January — warm enough to stay in as long as you like. This is the warmest the water gets all year.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

January 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 — 3 °C cooler, 10 days more rain. São Paulo is close enough to be a coin toss — 2.2 °C cooler, 9 days more rain.

So: January works, with April the better month by 18 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Porto Alegre

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