Climate averages 1991–2020
Manaus weather
in September.
A hot, wet month: the 2nd warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Manaus: daytime highs average 31.2°C and nights cool to about 24.6°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 121 mm of rain on roughly 20 days, which makes September a wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 05 min on an average September day.
The nearest other city in this atlas is Manacapuru (70 km away). In September its highs average 30.5°C, 0.7°C cooler than Manaus, with 138 mm of rain.
Among the 448 cities listed in Brazil, Manaus ranks joint 88th of 448 for the warmest September highs and 363rd of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Manaus is 3.7°C warmer than that mean.
From September to October, average highs rise by 0.1°C to 31.3°C, and monthly rainfall rises from 121 mm to 159 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
Manaus climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.2°C24.1°C | 24.1°C | 296 | 28.0 | 12.312 h |
| February | 29.1°C24.0°C | 24.0°C | 296 | 25.5 | 12.212 h |
| March | 29.2°C24.1°C | 24.1°C | 375 | 29.5 | 12.112 h |
| April | 29.0°C24.0°C | 24.0°C | 363 | 28.8 | 12.012 h |
| May | 29.0°C23.9°C | 23.9°C | 312 | 29.1 | 12.012 h |
| June | 29.2°C23.7°C | 23.7°C | 164 | 23.5 | 11.912 h |
| July | 29.6°C23.6°C | 23.6°C | 105 | 19.9 | 12.012 h |
| August | 30.8°C24.1°C | 24.1°C | 99 | 17.3 | 12.012 h |
| September, selected | 31.2°C24.6°C | 24.6°C | 121 | 19.5 | 12.112 h |
| October | 31.3°C24.9°C | 24.9°C | 159 | 21.6 | 12.212 h |
| November | 30.6°C24.8°C | 24.8°C | 193 | 23.6 | 12.312 h |
| December | 29.6°C24.4°C | 24.4°C | 289 | 28.2 | 12.312 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
- Manacapuru in SeptemberBrazil · 70 kmHigh 30.5°C · Low 25.0°C · 138 mm rain
- Itacoatiara in SeptemberBrazil · 176 kmHigh 31.2°C · Low 25.2°C · 109 mm rain
- Coari in SeptemberBrazil · 363 kmHigh 30.2°C · Low 24.6°C · 123 mm rain
- Parintins in SeptemberBrazil · 369 kmHigh 31.7°C · Low 24.9°C · 94 mm rain
- Itaituba in SeptemberBrazil · 467 kmHigh 32.9°C · Low 24.1°C · 78 mm rain
- Oriximiná in SeptemberBrazil · 485 kmHigh 31.9°C · Low 25.5°C · 71 mm rain
- Tefé in SeptemberBrazil · 522 kmHigh 30.1°C · Low 23.8°C · 142 mm rain
- Santarém in SeptemberBrazil · 595 kmHigh 31.2°C · Low 26.2°C · 68 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 Manaus) is explained once on the Manaus year overview and on the Sources, method and limits page.