Weather in Manaus in August

Shoulder season. August is shoulder season in Manaus — cheaper, quieter, and a genuine gamble. Highs average 31 °C, lows 24.9 °C, and rain falls on 12 days — nothing in the month is working against you.

August is the highest-scoring month of the twelve. The nearest rival is July, and the month at the other end of the year is October.

Rain on 12 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 31 °C days and 24.9 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 19 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest August day reached 38.7 °C and the coldest night fell to 22.3 °C.

August is moderately variable: 9 mm in the driest year against 114 mm in the wettest, around an average of 50 mm. Roughly two Augusts in three land near that average, and the third does something else entirely.

Wind is light at 2.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 79%, high enough to notice on the warm days without dominating them.

How August sits in the year

The month is on the way up: 1.9 °C warmer than July, and September adds another 2.1 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short. Rain has already shifted: 5 days fewer than July had.

Daylight in August

Manaus sits close enough to the equator that daylight barely moves all year — 12 hours in August, against a range of just 0.4 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

An inland climate

Despite being inland, the year stays fairly even: 8.9 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, April is the trade worth considering — 11 points weaker on weather, and materially quieter.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

August in Manaus versus nearby

If Manaus is one option among several, the nearby comparison is worth making. Belém is the weaker option in August — within a degree on temperature, 7 days more rain. Cusco is a better bet in August — 12.8 °C cooler, 10 days less rain.

So: August is the answer for Manaus. If it is booked out or priced out, July is the next best thing at 4 points behind, and October is the month to keep off the shortlist.

Every month in Manaus

See all twelve months in Manaus, or where else to go in August.