Climate averages 1991–2020
Belém weather
in September.
A hot, fairly dry month: the 3rd warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Belém: daytime highs average 31.7°C and nights cool to about 24.6°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 24 mm of rain on roughly 7 days, which makes September a fairly dry month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 06 min on an average September day.
The nearest other city in this atlas is Barcarena (15 km away). In September its highs average 31.7°C, about as warm as Belém, with 19 mm of rain.
Among the 448 cities listed in Brazil, Belém ranks joint 75th of 448 for the warmest September highs and joint 70th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Belém is 4.2°C warmer than that mean.
From September to October, average highs rise by 0.4°C to 32.1°C, and monthly rainfall rises from 24 mm to 27 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Belém climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.1°C24.3°C | 24.3°C | 232 | 27.0 | 12.212 h |
| February | 28.6°C24.1°C | 24.1°C | 317 | 27.2 | 12.212 h |
| March | 28.5°C24.1°C | 24.1°C | 404 | 30.4 | 12.112 h |
| April | 28.6°C24.2°C | 24.2°C | 394 | 29.4 | 12.112 h |
| May | 29.1°C24.3°C | 24.3°C | 256 | 26.9 | 12.112 h |
| June | 29.5°C24.3°C | 24.3°C | 107 | 20.0 | 12.012 h |
| July | 29.8°C24.1°C | 24.1°C | 68 | 15.0 | 12.012 h |
| August | 30.9°C24.4°C | 24.4°C | 36 | 10.0 | 12.112 h |
| September, selected | 31.7°C24.6°C | 24.6°C | 24 | 6.7 | 12.112 h |
| October | 32.1°C24.8°C | 24.8°C | 27 | 6.4 | 12.112 h |
| November | 31.9°C25.0°C | 25.0°C | 44 | 7.3 | 12.212 h |
| December | 30.7°C24.9°C | 24.9°C | 108 | 17.8 | 12.212 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Barcarena in SeptemberBrazil · 15 kmHigh 31.7°C · Low 24.8°C · 19 mm rain
- Ananindeua in SeptemberBrazil · 18 kmHigh 32.0°C · Low 24.1°C · 39 mm rain
- Marituba in SeptemberBrazil · 21 kmHigh 32.3°C · Low 23.9°C · 39 mm rain
- Santa Isabel do Pará in SeptemberBrazil · 42 kmHigh 32.0°C · Low 23.7°C · 39 mm rain
- Abaetetuba in SeptemberBrazil · 51 kmHigh 32.4°C · Low 24.8°C · 19 mm rain
- Moju in SeptemberBrazil · 56 kmHigh 33.4°C · Low 24.0°C · 27 mm rain
- Castanhal in SeptemberBrazil · 67 kmHigh 32.3°C · Low 23.4°C · 34 mm rain
- Cametá in SeptemberBrazil · 141 kmHigh 33.3°C · Low 24.7°C · 28 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Belém) is explained once on the Belém year overview and on the Sources, method and limits page.