BrazilAverage weather for Porto Alegre in September
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.
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. A few showers might pop up early in the month, but overall, it’ll stay mostly sunny and dry.
With the temperature difference between day and night, it’s smart to wear layers.
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.
Since it cools down at night, it’s a good idea to wear layers.
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.
Because temperatures drop in the evening, wearing layers is recommended.
In September, there is an average of 109 mm of precipitation, spread over 8 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
Porto Alegre in September |
New York | ||
|---|---|---|---|
 Average temperature |
29°C | 27°C | |
 Max. temperature |
31°C | 31°C | |
| Min. temperature |
24°C | -5°C | |
 Total precipitation |
109 mm | 57 mm | |
| Rainy days |
8 days | 9 days | |
August
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.
Is September a good time to visit Porto Alegre?
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.
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.
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.
Daily Temperature in September in Porto Alegre
This chart shows the average daily high and low temperatures in September for Porto Alegre, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in September in Porto Alegre
The chart below shows the average daily precipitation in September for Porto Alegre, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 8 days of precipitation in Porto Alegre.
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.
Temperature in September in Porto Alegre over the years
This chart shows the average temperature in September in Porto Alegre, measured in degrees Celsius, over the past few years.
Total precipitation in September in Porto Alegre over the years
This chart shows the average precipitation in September in Porto Alegre, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
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.
Weather experiences in September in Porto Alegre
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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.
Or check out the climate of Porto Alegre for all months at once
