Rio de Janeiro weather in May
May in Rio de Janeiro: warm, a little rain, with very humid — one of the best months to visit.
#2 of 12 months in Rio de Janeiro · #243 of 604 destinations to visit in May · comfort 84/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Rio de Janeiro climate normals — May
| Daytime high | 26°C / 79°F | 🌤 warm |
|---|---|---|
| Nighttime low | 19°C / 66°F | |
| Feels like (high) | 28°C / 82°F | |
| Rainfall | 61 mm / 2.4 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 18°C / 64°F | |
| Sunshine | 9 h/day | |
| Daylight | 11 h | |
| Wind | 10 km/h / 6 mph | |
| Air quality (US AQI) | 81 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Rio de Janeiro in May — FAQ
- Is May a good time to visit Rio de Janeiro?
- May in Rio de Janeiro: warm, a little rain, with very humid — one of the best months to visit. It ranks #2 of 12 months for Rio de Janeiro on SeasonMap's comfort score (84/100).
- What is the weather like in Rio de Janeiro in May?
- In May, Rio de Janeiro averages a daily high of 26.1°C and a low of 18.9°C, with about 60.9 mm of rain over roughly 8.6 rainy days.
- What is the air quality in Rio de Janeiro in May?
- Rio de Janeiro has a mean US Air Quality Index of about 81 in May.