Belém weather in September
In September, Belém has an average high of 33 °C91 °F and an average low of 24 °C75 °F, with about 75 mm3.0 in of precipitation. It is the 3rd warmest month of the year and the driest.
How September compares with other months
Compared with August, September is 1.2 °C2.1 °F warmer on average and drier by 18 mm0.7 in. Compared with October, September is about the same temperature. Daylight lasts about 12.1 hours around the middle of the month. Average relative humidity is 73% and the average cloud amount 42%.
Is September a good time to visit Belém?
Yes — September is one of the most comfortable months to visit Belém by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in September
For Belém in September, pack very light, breathable clothing, a sun hat and plenty of water.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Belém | 3391 | 2475 | 753.0 |
| Ananindeua | 3289 | 2373 | 763.0 |
| Castanhal | 3289 | 2373 | 763.0 |
| Cametá | 3493 | 2475 | 662.6 |
| Bragança | 3086 | 2475 | 261.0 |
| Paragominas | 3494 | 2373 | 441.7 |
| Breves | 3493 | 2374 | 692.7 |
| Tucuruí | 3596 | 2577 | 301.2 |
| Macapá | 3188 | 2373 | 401.6 |
Nearby places that are more than 1 °C1.8 °F warmer in September: Tucuruí; cooler: Ananindeua, Castanhal, Bragança and Macapá.
Other months in Belém
- January29 °C83 °F / 24 °C75 °F
- February28 °C82 °F / 24 °C75 °F
- March28 °C82 °F / 24 °C75 °F
- April28 °C82 °F / 24 °C76 °F
- May28 °C83 °F / 24 °C76 °F
- June29 °C83 °F / 24 °C75 °F
- July29 °C84 °F / 24 °C75 °F
- August31 °C87 °F / 24 °C75 °F
- September33 °C91 °F / 24 °C75 °F
- October33 °C92 °F / 24 °C76 °F
- November33 °C91 °F / 25 °C76 °F
- December31 °C88 °F / 24 °C76 °F
Frequently asked questions
How warm is Belém in September?
In September the average high in Belém is 33 °C (91 °F) and the average low is 24 °C (75 °F).
Does it rain a lot in Belém in September?
On average about 75 mm (3.0 in) of precipitation falls in September; it ranks 12th of the 12 months.
Is September the warmest month in Belém?
No. The warmest month in Belém is October, with an average high of 33 °C (92 °F). The coldest month is August, with an average low of 24 °C (75 °F).
How long is the day in Belém in September?
In the middle of September the day in Belém lasts about 12.1 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Belém in September?
The average relative humidity in September is about 73%. Combined with warm days, it can feel muggy.
How cloudy is Belém in September?
On average about 42% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.