Amazonas weather in September
September is one of the best months to visit Amazonas: highs of 33°C (91°F) and about 68 mm (2.7 in) of rain on average. Nights average 25°C (78°F) and cloud cover 72% (NASA POWER, 2001–2025 averages). It is the 2nd driest month of the year and the warmest. Compared with August, it is warmer and wetter; October brings highs of 33°C (91°F) and 103 mm (4.1 in) of rain.
Figures are long-term averages for Manaus, the largest city in Amazonas. See below for other places.
Is September a good time to visit Amazonas?
best month Weather score 68/100.
Yes. September is one of the best months for weather in Amazonas.
Does it rain a lot in Amazonas in September?
Some rain is normal: about 68 mm (2.7 in) falls in an average September. It is the 2nd driest month of the year.
How warm is Amazonas in September?
Days average 33°C (91°F) and nights 25°C (78°F).
Amazonas weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 29°C (83°F) | 24°C (76°F) | 224 mm | 85% | least pleasant |
| February | 28°C (83°F) | 24°C (75°F) | 236 mm | 86% | least pleasant |
| March | 28°C (83°F) | 24°C (75°F) | 268 mm | 87% | least pleasant |
| April | 28°C (83°F) | 24°C (76°F) | 262 mm | 85% | least pleasant |
| May | 28°C (83°F) | 24°C (76°F) | 205 mm | 81% | least pleasant |
| June | 28°C (83°F) | 24°C (75°F) | 119 mm | 69% | fair |
| July | 29°C (84°F) | 24°C (75°F) | 76 mm | 59% | best |
| August | 31°C (87°F) | 25°C (76°F) | 50 mm | 60% | best |
| September | 33°C (91°F) | 25°C (78°F) | 68 mm | 72% | best |
| October | 33°C (91°F) | 26°C (78°F) | 103 mm | 80% | fair |
| November | 31°C (88°F) | 26°C (78°F) | 135 mm | 83% | fair |
| December | 30°C (85°F) | 25°C (76°F) | 213 mm | 83% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
Weather across Amazonas in September
Weather can differ a lot within Amazonas: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Manaus | 33°C (91°F) | 25°C (78°F) | 68 mm | best |
| Itacoatiara | 33°C (91°F) | 25°C (77°F) | 56 mm | best |
| Manacapuru | 33°C (92°F) | 26°C (78°F) | 73 mm | best |
| Parintins | 34°C (93°F) | 26°C (79°F) | 48 mm | best |
| Coari | 31°C (88°F) | 25°C (77°F) | 92 mm | best |
| Tefé | 29°C (85°F) | 24°C (75°F) | 113 mm | best |
| Tabatinga | 29°C (85°F) | 23°C (74°F) | 144 mm | best |
| Maués | 34°C (93°F) | 25°C (76°F) | 58 mm | best |
| Manicoré | 31°C (88°F) | 23°C (74°F) | 80 mm | best |
| Humaitá | 33°C (92°F) | 24°C (75°F) | 83 mm | fair |
| São Gabriel da Cachoeira | 29°C (84°F) | 23°C (74°F) | 152 mm | best |
| Iranduba | 34°C (93°F) | 25°C (78°F) | 62 mm | fair |