Porto Alegre weather in May
May in Porto Alegre: nice, rainy, with very humid — an excellent time to visit.
#6 of 12 months in Porto Alegre · #508 of 897 destinations to visit in May · comfort 81/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Porto Alegre in May
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Porto Alegre climate normals — May
| Daytime high | 21°C / 70°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 55°F | |
| Rainfall | 131 mm / 5.2 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 14°C / 56°F | |
| Sunshine | 6.9 h/day | |
| Daylight | 10.6 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 51 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Porto Alegre in May — FAQ
- Is May a good time to visit Porto Alegre?
- May in Porto Alegre: nice, rainy, with very humid — an excellent time to visit. It ranks #6 of 12 months for Porto Alegre on SeasonMap's comfort score (81/100).
- What is the weather like in Porto Alegre in May?
- In May, Porto Alegre averages a daily high of 21°C and a low of 13°C, with about 131 mm of rain over roughly 11.4 rainy days.
- What is the air quality in Porto Alegre in May?
- Porto Alegre has a mean US Air Quality Index of about 51 in May.