7-day weather forecast for Porto Alegre
7-day weather forecast for Porto Alegre: 20°C, Mainly clear, Humidity 46%, Wind 22 km/h.
Porto Alegre sits at 30.0° south latitude, in the subtropics, 15 m above sea level, in the America/Sao_Paulo time zone. Over the week ahead highs range from 18° to 26° and lows from 9° to 17°, averaging 17°.
Forecast rainfall totals 32 mm, and 1 of the seven days carry a chance above 50%. Today the sun rises at 05:44 and sets at 18:36: 12:52 of daylight.
| Conditions | high | low | rain | Wind | UV index | |
|---|---|---|---|---|---|---|
| Today | Light drizzle | 20° | 13° | 65% | 23 km/h | 6 |
| Tomorrow | Light drizzle | 18° | 11° | 20% | 19 km/h | 7 |
| Mon, Oct 19 | Overcast | 19° | 10° | 8% | 14 km/h | 8 |
| Tue, Oct 20 | Fog | 21° | 9° | 4% | 18 km/h | 8 |
| Wed, Oct 21 | Overcast | 23° | 13° | 11% | 23 km/h | 8 |
| Thu, Oct 22 | Overcast | 26° | 16° | 22% | 18 km/h | 7 |
| Fri, Oct 23 | Thunderstorm | 26° | 17° | 43% | 17 km/h | 2 |
Weather data by Open-Meteo (ECMWF, GFS, ICON models and national weather services). Updated every 15 minutes.
Weather in Porto Alegre month by month
The table gathers the 2016-2025 climate normals for Porto Alegre: average highs and lows, total rainfall and number of rainy days for each month of the year.
Porto Alegre has an annual mean temperature of 20.3°. The warmest month is January, when highs sit around 30.6°; the coldest is July, with average lows of 10.3°. The 20.3° gap between those two ends of the calendar is the measure of how much the year swings here.
Rainfall totals about 1,476 mm a year, spread over roughly 131 rainy days. The wettest month is September, averaging 172.6 mm across 12 days; the driest is February, with 83.5 mm.
| Month | Average high | Average low | Rainfall | Rainy days |
|---|---|---|---|---|
| January | 30.6° | 21.3° | 99.7 mm | 13 |
| February | 30.3° | 20.8° | 83.5 mm | 10 |
| March | 28.2° | 19.8° | 121.5 mm | 11 |
| April | 25.5° | 17.2° | 98.7 mm | 9 |
| May | 21.3° | 13.5° | 172.4 mm | 12 |
| June | 19.3° | 11° | 144 mm | 10 |
| July | 19.2° | 10.3° | 125 mm | 9 |
| August | 20.7° | 11.2° | 102.8 mm | 10 |
| September | 22.5° | 13.9° | 172.6 mm | 12 |
| October | 24.2° | 15.4° | 138.5 mm | 13 |
| November | 26.6° | 16.9° | 120.7 mm | 12 |
| December | 29.2° | 19.4° | 96.9 mm | 10 |
When to visit Porto Alegre
For travellers who plan around the weather, April, August, and November tend to be the most comfortable stretch: average highs between 20.7° and 26.6° and rainfall below the yearly average.
What to expect each month
- In January, highs sit near 30.6° and lows near 21.3°, with about 99.7 mm of rain over 13 days.
- In February, highs sit near 30.3° and lows near 20.8°, with about 83.5 mm of rain over 10 days.
- In March, highs sit near 28.2° and lows near 19.8°, with about 121.5 mm of rain over 11 days.
- In April, highs sit near 25.5° and lows near 17.2°, with about 98.7 mm of rain over 9 days.
- In May, highs sit near 21.3° and lows near 13.5°, with about 172.4 mm of rain over 12 days.
- In June, highs sit near 19.3° and lows near 11°, with about 144 mm of rain over 10 days.
- In July, highs sit near 19.2° and lows near 10.3°, with about 125 mm of rain over 9 days.
- In August, highs sit near 20.7° and lows near 11.2°, with about 102.8 mm of rain over 10 days.
- In September, highs sit near 22.5° and lows near 13.9°, with about 172.6 mm of rain over 12 days.
- In October, highs sit near 24.2° and lows near 15.4°, with about 138.5 mm of rain over 13 days.
- In November, highs sit near 26.6° and lows near 16.9°, with about 120.7 mm of rain over 12 days.
- In December, highs sit near 29.2° and lows near 19.4°, with about 96.9 mm of rain over 10 days.
Recorded extremes
Across 2016-2025, the thermometer reached 39° at the top of the series and fell to 1.6° at the bottom. These are observed values, not averages: they show what the city has actually faced.
Normals computed from the ERA5 reanalysis (Copernicus/ECMWF), 2016-2025 series.
FAQ
What is the temperature in Porto Alegre right now?
It is 20°C in Porto Alegre right now, with mainly clear. It feels like 16°C.
Will it rain in Porto Alegre today?
The peak chance of rain today is 65%, with about 1.8 mm expected.
What will the weather be tomorrow in Porto Alegre?
Tomorrow the high is 18° and the low 11°, with light drizzle.
Where does the data come from and how often is it updated?
Data comes from the ECMWF, GFS and ICON models and national weather services via Open-Meteo, updated every 15 minutes.
What is the warmest month in Porto Alegre?
The warmest month is January, with average highs of 30.6° and lows of 21.3°.
Does it rain a lot in Porto Alegre?
The city gets about 1,476 mm a year over 131 rainy days. The wettest month is September, with 172.6 mm.
When is the best time to visit Porto Alegre?
On weather grounds, April, August, and November combine the most agreeable temperatures with below-average rainfall.