Porto Alegre is at its most pleasant from late July to early December, and again from April to early June. For sun, aim for mid February to March; for walking, go from May to mid October.
When to go five ratings · thirty-six ten-day sections · click a cell to read it
The sun season here runs from mid February to March, with a second spell from late December to early January. It peaks in early March, at 61. The weakest stretch is in early and mid July, when it drops to 5, mostly because it is too cool. The clearest skies come in August, when the sky is typically 52% covered at midday (partly cloudy).
For being outside, go from late July to early December, with a second spell from April to early June. It peaks in early October, at 78. Avoid mid January to early February for this: it falls to 25, mostly because it is too hot.
The walking season here runs from May to mid October. It peaks in mid May, at 75. The weakest stretch is from late December to early March, when it drops to 6, mostly because it is too warm.
The year, measured
The average temperature in Porto Alegre over the whole year is 20°C. January is the hottest month, with highs of about 29°C; July is the coldest, with lows of about 11°C. Porto Alegre has no sharply defined rainy season: the chance of rain on a given day runs from 29% in July, the driest month, to 47% in September, the wettest. Winds in Porto Alegre are highest in December, averaging 3.3 m/s (12 km/h), and lightest in May, at 2.2 m/s (8 km/h). The prevailing wind is from the S. The clearest skies in Porto Alegre come in February, when the sky is typically 47% covered; September is the cloudiest month, at 63%.
Month by month Porto Alegre climate by month: average temperatures year round · click a month to read it
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 29°C | 21°C | 30°C | 44% | 51% | 3.2 m/s | 28 | 55 | 7 |
| February | 28°C | 21°C | 30°C | 31% | 47% | 2.9 m/s | 30 | 56 | 10 |
| March | 27°C | 20°C | 28°C | 36% | 52% | 2.7 m/s | 42 | 58 | 15 |
| April | 24°C | 17°C | 24°C | 31% | 52% | 2.5 m/s | 68 | 42 | 38 |
| May | 20°C | 14°C | 19°C | 44% | 54% | 2.2 m/s | 72 | 16 | 67 |
| June | 18°C | 12°C | 16°C | 39% | 57% | 2.2 m/s | 54 | 11 | 70 |
| July | 17°C | 11°C | 16°C | 29% | 52% | 2.3 m/s | 51 | 9 | 69 |
| August | 19°C | 12°C | 18°C | 46% | 53% | 2.4 m/s | 61 | 14 | 69 |
| September | 21°C | 15°C | 20°C | 47% | 63% | 3.0 m/s | 69 | 17 | 65 |
| October | 23°C | 16°C | 22°C | 46% | 61% | 3.2 m/s | 74 | 25 | 55 |
| November | 25°C | 18°C | 25°C | 39% | 51% | 3.2 m/s | 63 | 44 | 34 |
| December | 28°C | 20°C | 28°C | 33% | 51% | 3.3 m/s | 42 | 52 | 19 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Porto Alegre weather by season
Year round, Porto Alegre has days of about 17°C at their warmest in July, its coolest month, and 29°C in January, its warmest; the coolest hours of the day run from 11°C to 21°C through the year, and the average temperature over the year is 20°C around the clock. Rain is most likely around September and least likely around July. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Porto Alegre weather in winterJune to August
Winter in Porto Alegre has typical daily highs of about 18°C and lows of about 12°C, with a 38% chance of rain on a given day.
Porto Alegre weather in springSeptember to November
Spring in Porto Alegre has typical daily highs of about 23°C and lows of about 16°C, with a 44% chance of rain on a given day.
Porto Alegre weather in summerDecember to February
Summer in Porto Alegre has typical daily highs of about 28°C and lows of about 21°C, with a 36% chance of rain on a given day.
Porto Alegre weather in autumnMarch to May
Autumn in Porto Alegre has typical daily highs of about 24°C and lows of about 17°C, with a 37% chance of rain on a given day.
When is the rainy season in Porto Alegre?
Porto Alegre has no sharply defined rainy season: the chance of rain on a given day runs from 29% in July, the driest month, to 47% in September, the wettest.
What time of year is Porto Alegre windiest?
Winds in Porto Alegre are highest in December, averaging 3.3 m/s (12 km/h), and lightest in May, at 2.2 m/s (8 km/h). The prevailing wind is from the S.
What is the average temperature in Porto Alegre year round?
The average temperature in Porto Alegre over the whole year is 20°C. January is the hottest month, with highs of about 29°C; July is the coldest, with lows of about 11°C.
Where to go instead in mid January, the weakest time here for being outside
How this is worked out
Every figure is a decade of weather-station observations blended into one typical year, in ten-day sections. The ratings, the chart and the feels-like column are read at midday local solar time. Being outside is the Easy outdoors rating, Sun is Sunbathing and Walking is Active outdoors, each out of 100: Good from 55, Ideal from 80. They describe what a time of year is usually like here, not a forecast. The dotted links open the map at that time of year; set its time of day to midday to see these numbers.