Weathermondo.com
BrazilThe weather in September in Porto Alegre
It's warm in September in Porto Alegre with an average temperature of 29°C. Temperatures this month range from a low of 24°C to a high of 31°C. At night, you can expect temperatures between 14°C and 19°C.
Looking for sun? September isn’t a good month to be in Porto Alegre. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Porto Alegre, Brazil. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 41°C in 2020, Porto Alegre reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 14°C in 2018. The extreme nighttime temperatures ranged from a lowest recorded value of 3°C to a highest value of 25°C.
Rainfall amount
In September, there is an average of 109 mm of precipitation, spread over 13 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
Daily weather in September for Porto Alegre
Click on any day in September to get detailed info about the usual weather on that day in Porto Alegre. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Porto Alegre | New York | |
|---|---|---|
| Average temperature | 29°C | 27°C |
| Max. temperature | 31°C | 31°C |
| Min. temperature | 14°C | -5°C |
| Total precipitation | 109 mm | 57 mm |
| Rainy days | 13 days | 9 days |
Start of September
The month of September starts in Porto Alegre with hot temps, averaging around 28°C during the day and nights around 16°C.
Mid September
By mid-September, daytime temps rise to around 29°C, with nights around 17°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of September
By the end of September, the average daytime temperature in Porto Alegre is around 30°C, while nighttime temps are about 18°C. A shower might pop up, but overall, the weather will be dry and sunny.
Find affordable trips to Porto Alegre
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Porto Alegre for all months and discover the best travel time
Curious about the weather in other parts of Brazil? Check out the climate and weather for spots like Rio de Janeiro, Salvador, Pipa, or explore other destinations in Brazil.
Temperature charts
These charts show the average temperatures in September in Porto Alegre, Brazil. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Porto Alegre
Temperature in September in Porto Alegre over the years
Precipitation charts
These charts show the average amount of precipitation in September in Porto Alegre, Brazil. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Porto Alegre
Total precipitation in September in Porto Alegre over the years
Daily UV index in September in Porto Alegre
This chart shows the average daily UV index in September in Porto Alegre, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Porto Alegre
Have you been to Porto Alegre in September?
Share your weather experience in September in Porto Alegre.
Average weather in Porto Alegre by month
Click on a month below to see detailed weather info for Porto Alegre. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.