Manaus weather in September
In September, Manaus has an average high of 33 °C91 °F and an average low of 25 °C78 °F, with about 68 mm2.7 in of precipitation. It is the 2nd warmest month of the year and ranks 11th for precipitation.
How September compares with other months
Compared with August, September is 1.4 °C2.5 °F warmer on average and wetter by 18 mm0.7 in. Compared with October, September is about the same temperature and drier by 35 mm1.4 in. Daylight lasts about 12.1 hours around the middle of the month. Average relative humidity is 72% and the average cloud amount 72%.
Is September a good time to visit Manaus?
September is not among the most comfortable months by our comfort score: it is hot (average high 33 °C91 °F) and it is fairly wet (68 mm2.7 in). The most comfortable months in Manaus are July and August.
What to wear in September
For Manaus 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 |
|---|---|---|---|
| Manaus | 3391 | 2578 | 682.7 |
| Manacapuru | 3392 | 2678 | 732.9 |
| Itacoatiara | 3391 | 2577 | 562.2 |
| Parintins | 3493 | 2679 | 481.9 |
| Itaituba | 3492 | 2577 | 722.8 |
| Santarém | 3290 | 2679 | 361.4 |
| Boa Vista | 3289 | 2374 | 843.3 |
| Porto Velho | 3494 | 2475 | 833.3 |
| Altamira | 3391 | 2374 | 461.8 |
Nearby places that are more than 1 °C1.8 °F cooler: Boa Vista and Altamira.
Other months in Manaus
- January29 °C84 °F / 25 °C76 °F
- February29 °C83 °F / 24 °C76 °F
- March28 °C83 °F / 24 °C76 °F
- April28 °C83 °F / 24 °C76 °F
- May28 °C83 °F / 24 °C76 °F
- June28 °C83 °F / 24 °C75 °F
- July29 °C84 °F / 24 °C75 °F
- August31 °C88 °F / 25 °C76 °F
- September33 °C91 °F / 25 °C78 °F
- October33 °C91 °F / 26 °C79 °F
- November32 °C89 °F / 26 °C78 °F
- December30 °C85 °F / 25 °C77 °F
Frequently asked questions
How warm is Manaus in September?
In September the average high in Manaus is 33 °C (91 °F) and the average low is 25 °C (78 °F).
Does it rain a lot in Manaus in September?
On average about 68 mm (2.7 in) of precipitation falls in September; it ranks 11th of the 12 months.
Is September the warmest month in Manaus?
Yes. September is the warmest month in Manaus. The coldest month is July, with an average low of 24 °C (75 °F).
How long is the day in Manaus in September?
In the middle of September the day in Manaus 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 Manaus in September?
The average relative humidity in September is about 72%. Combined with warm days, it can feel muggy.
How cloudy is Manaus in September?
On average about 72% 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.