Mild
Average highs are around 21°C, so days are mild rather than hot.
September verdict
Porto Alegre, Brazil in September
Weather score36Poor
Poor for holiday weather
Average highs are around 21°C, so days are mild rather than hot. Sunshine averages 5h per day, enough for a balanced month. Rainfall averages 141mm, so some wet days are possible.
September weather
Monthly averages
Temp
21°C
Rain
141mm
Sun
5h
Sea
17°C
Weather score
36
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 141mm, so some wet days are possible.
Some sun
Sunshine averages 5h per day, enough for a balanced month.
Cool sea
Sea temperatures average 17°C, so the water can feel cool.
Map
Weather map
Compare Porto Alegre, Brazil with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September21°C average high
September is on the cooler side of Porto Alegre's year, useful if you prefer less intense daytime heat.
Warmest monthsJanuary to March and December
This stretch sets the upper range for average daytime heat.
Rain
September141mm average rain
September is one of Porto Alegre's wettest months, so rain is likely to be a major planning factor.
Driest monthsJanuary to May and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September5 hours average sun
September is below Porto Alegre's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsJanuary to February and November to December
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September17°C average sea
September is below Porto Alegre's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJanuary to March and December
Sea temperatures are usually near 26°C in this stretch, so swimming comfort is at its strongest.
Weather score
September36 weather score
September scores below Porto Alegre's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJanuary to March and November to December
These months have the strongest weather score in the monthly averages.