Porto Alegre weather in September
September in Porto Alegre: nice, soaked, with very humid — fine if you can take 13 rainy days.
#5 of 12 months in Porto Alegre · #482 of 897 destinations to visit in September · comfort 82/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Porto Alegre in September
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Porto Alegre climate normals — September
| Daytime high | 22°C / 72°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 56°F | |
| Rainfall | 185 mm / 7.3 in | ⛈ soaked |
| Rainy days | 13 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 14°C / 56°F | |
| Sunshine | 7.9 h/day | |
| Daylight | 11.9 h | |
| Wind | 19 km/h / 11 mph | |
| Air quality (US AQI) | 52 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Porto Alegre in September — FAQ
- Is September a good time to visit Porto Alegre?
- September in Porto Alegre: nice, soaked, with very humid — fine if you can take 13 rainy days. It ranks #5 of 12 months for Porto Alegre on SeasonMap's comfort score (82/100).
- What is the weather like in Porto Alegre in September?
- In September, Porto Alegre averages a daily high of 22°C and a low of 13.3°C, with about 184.9 mm of rain over roughly 13.2 rainy days.
- What is the air quality in Porto Alegre in September?
- Porto Alegre has a mean US Air Quality Index of about 52 in September.