Manaus is warmest in September, averaging 34° by day and 26° at night. The wettest month is March with 313 mm, and the year brings about 2022 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | 29° | 25° | 223 mm | 12.2 h | Rainy season |
| February | 29° | 24° | 213 mm | 12.1 h | Rainy season |
| March | 29° | 24° | 313 mm | 12.0 h | Rainy season |
| April | 29° | 25° | 240 mm | 11.9 h | Rainy season |
| May | 29° | 25° | 211 mm | 11.9 h | Rainy season |
| June | 29° | 24° | 132 mm | 11.8 h | Mild |
| July | 29° | 24° | 81 mm | 11.8 h | Beach weather |
| August | 32° | 25° | 56 mm | 11.9 h | Beach weather |
| September | 34° | 26° | 66 mm | 12.0 h | Beach weather |
| October | 34° | 26° | 105 mm | 12.1 h | Beach weather |
| November | 33° | 26° | 165 mm | 12.1 h | Mild |
| December | 30° | 25° | 217 mm | 12.2 h | Rainy season |
High and low are average daily maximum and minimum, rain is typical monthly total, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER — averages, not promises.
When to go
Beach weather: July, August, September and October — highs around 32°, nights no colder than 24°, and at most 105 mm of rain in a month.
Wet season: January, February, March, April, May and December — up to 313 mm in a single month.