Weather in Manaus in January

A hard month. January asks something of you. Go in knowing what. You should expect rain on 25 days of the month, which is more days wet than dry.

January ranks 6 of 12 in Manaus: past the worst of the year but short of August, which is the month to book if the dates are open.

Rain on 25 of the month's 31 days, 8 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Natural fibres and a second shirt for the day. At 87% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 6 days top 30 °C — hot spells arrive, but they break; the day barely swings — 4.3 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest January day reached 38 °C and the coldest night fell to 22.3 °C, and the wettest single day dropped 47 mm — roughly 21% of the month's rain in one day.

January is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest January on record still delivered 355 mm against 95 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 225 mm average is a reasonable planning figure, not a promise.

Wind is light at 2.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity at 87% is the real story though — it is the number that decides how the day feels, not the 29.1 °C.

How January sits in the year

Temperatures hold steady either side: 29.9 °C in December, 29.1 here, 28.8 in February. Nothing about the timing within the month matters much.

Daylight in January

Manaus sits close enough to the equator that daylight barely moves all year — 12.3 hours in January, 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

Shoulder. The value months — prices ease off and you get the place closer to itself.

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

January in Manaus versus nearby

If Manaus is one option among several, the nearby comparison is worth making. Belém is close enough to be a coin toss — within a degree on temperature, 5 days more rain. Cusco is close enough to be a coin toss — 12.2 °C cooler, 4 days less rain.

So: January works, with August the better month by 12 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Manaus

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