Belém weather in September
September in Belém: sweltering, dry, with clean air — a great time to visit.
#3 of 12 months in Belém · #411 of 604 destinations to visit in September · comfort 71/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Belém climate normals — September
| Daytime high | 32°C / 90°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Feels like (high) | 37°C / 99°F | |
| Rainfall | 28 mm / 1.1 in | ☀️ dry |
| Rainy days | 8 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 22°C / 72°F | |
| Sunshine | 11.3 h/day | |
| Daylight | 12.1 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Belém in September — FAQ
- Is September a good time to visit Belém?
- September in Belém: sweltering, dry, with clean air — a great time to visit. It ranks #3 of 12 months for Belém on SeasonMap's comfort score (71/100).
- What is the weather like in Belém in September?
- In September, Belém averages a daily high of 32.2°C and a low of 24.9°C, with about 27.9 mm of rain over roughly 8.2 rainy days.
- What is the air quality in Belém in September?
- Belém has a mean US Air Quality Index of about 34 in September.