Climate and monthly weather forecast
Manaus, Brazil

Taking into account the Köppen climate classification, Manaus in Brazil is characterized by an Af or Tropical Rainforest climate. This city, situated in the heart of the Amazon rainforest, experiences high humidity, significant rainfall, and consistently high temperatures throughout the year.

Throughout the annual cycle, the temperatures in Manaus remain relatively stable. High temperatures fluctuate marginally from 30.4°C (86.7°F) in February to a peak value of 32.9°C (91.2°F) in September. Low temperatures, likewise, vary only subtly, ranging from 22.7°C (72.9°F) in July to 23.7°C (74.7°F) in October and November. These values highlight the city's tropical climate, noted for its consistently warm temperatures.

Manaus receives a considerable amount of rainfall, with average monthly totals stretching from a minimum of 47mm (1.85") in August to an impressive 335mm (13.19") in March. Correspondingly, the number of rainfall days alters from 6 days in August and September to as many as 20 days in March. This information underscores the city's tropical rainforest climate, which includes regular, intense rainfall.

As to be expected in a tropical setting, relative humidity remains high, with monthly averages reaching from 77% in August and September, peaking at 88% in March. The city experiences around 12 hours of daylight throughout the year, with minor variations. The number of sunshine hours extends from 3.1 hours in February to a maximum of 7.3 hours in August. UV index values remain at a consistently high level, indicative of the city's proximity to the equator.

Given its tropical rainforest climate, the optimal time to visit Manaus would be during the drier months when rainfall and humidity are at their lowest. With a drop in rainfall to 47mm (1.85") and reduced rainfall days to 6, August offers the driest conditions. Moreover, August also sees an increase in sunshine hours to 7.3 hours daily, coupled with lower relative humidity levels at 77%.

Conversely, the unfavorable period for tourism in Manaus stretches from February to April. These months record the highest rainfall measurements, with March topping at 335mm (13.19") over a span of 20 days. Additionally, these months exhibit the highest relative humidity levels, peaking at 88% in March, potentially posing discomfort to visitors not accustomed to such conditions.

In Manaus, spring months from September to November witness high temperatures ranging from 32.9°C (91.2°F) down to 31.3°C (88.3°F) and low temperatures floating between 23.7°C (74.7°F) to 23°C (73.4°F). Rainfall begins to increase during this period, with an elevation from 74mm (2.91") in September to 174mm (6.85") in November across 9 to 12 days of rainfall. However, relative humidity levels and daily sunshine hours slightly decrease, providing somewhat comfortable conditions for outdoor activities.

During the summer period in Manaus, between December and February, high temperatures range from 31.3°C (88.3°F) to 30.4°C (86.7°F), while low temperatures rest around 23.5°C (74.3°F) to 23.1°C (73.6°F). This season is particularly wet, with rainfall of 220mm (8.66") in December, escalating to 290mm (11.42") in February over 16 to 18 rainfall days. Coupled with higher relative humidity levels and fewer sunshine hours, summer days can feel intensely humid and damp.

Autumn in Manaus spans from March to May, with high temperatures fluctuating between 30.6°C (87.1°F) and 30.6°C (87.1°F) and low temperatures from 23.1°C (73.6°F) to 23.3°C (73.9°F). March sees the highest rainfall of 335mm (13.19") over 20 days and the most elevated relative humidity levels at 88%. As May approaches, these measurements decrease, allowing for more sunshine hours and fewer rainfall days.

Winter, from June to August, presents high temperatures ranging from 32.6°C (90.7°F) down to 31°C (87.8°F) and low temperatures between 23°C (73.4°F) and 22.7°C (72.9°F). June sees a substantial drop in rainfall to 115mm (4.53") over 11 days, dropping further in August to 47mm (1.85") over 6 days. Coupled with lowering relative humidity and enhancing sunshine hours, this marks the onset of a relatively drier period in the city.

The beginning of a new year brings humid weather to Manaus, Brazil, making the experience slightly sultry and tropical. January tends to be warm, with the average high temperature peaking at 30.5°C (86.9°F), presenting a perfect opportunity for beach-goers and sun-seekers. Weather in January »

The transition from January to February does not see much change in weather conditions. February is equally humid and warm as the preceding month, yet rainfall is slightly more abundant. This period is characetized by an average temperature high of 30.4°C (86.7°F). Weather in February »

Marking the end of the first quarter of the year, March in Manaus experiences the highest recorded rainfall of 335mm (13.19") spanning over 20 days of the month. While the weather becomes cloudier and rainier, it does not lose its warm temperature appeal. Weather in March »

The pace of travel begins to slow in April due to less sunshine hours. Weather becomes marginally cooler, yet maintains its tropical appeal. Sunshine hours decline to three hours and rainfall remains relatively high. Visitors during this period should remember to carry their umbrellas to negotiate the intermittent downpours without disrupting their plans. Weather in April »

May presents a gradual transition in weather patterns in Manaus, Brazil, with an upturn in sunshine hours to 4.8 per day. It is slightly drier than the preceding months but continues to exhibit a tropical climate. The city springs into a vibrant hub of recreational activities. Weather in May »

June brings the winter season to Manaus, but being near the equator, temperatures remain high at 31°C (87.8°F). The weather is drier with comparatively less rainfall and more sunshine hours. Outdoor activities such as local short trekking, wildlife watching or visiting waterfalls become more accessible. Weather in June »

July is the driest month of the year, experiencing only 85mm (3.35") of rain, offering a more comfortable climate for exploring the city. Weather becomes less humid and slightly cooler, making sightseeing and outdoor activities more enjoyable. Weather in July »

August in Manaus continues the trend of drier weather established in July. With an average low temperature of 23°C (73.4°F), evenings and nights become more comfortable. The combination of dry weather, high temperatures and the city's exuberant festival period make for an exhilarating experience. Weather in August »

September is a transitional period as the city starts to experience the onset of the wet season. Temperature highs rise further to 32.9°C (91.2°F) but offer a decent amount of sunshine hours. Rainfall begins to increase compared to the summer months however the high temperatures and clear periods make the weather bearable. Weather in September »

October sees the official arrival of the wet season in Manaus. The weather is characterized by average high temperatures of 32.8°C (91°F). High humidity levels, combined with high temperatures, provide classic tropical weather. Weather in October »

November in Manaus is a month characterized by high humidity levels, with an average relative humidity of 81%. Rainy days increase significantly and temperatures begin to decrease, making the climate slightly more moderate. Accommodating for the intermittent rain, city dwellers and visitors alike enjoy warm, cozy interiors. Weather in November »

December rounds out the year with weather trends consistent with those observed in November. High temperatures prevail at 31.3°C (88.3°F) and heavy showers are characteristic of the tropical wet season. Even though December has fewer daylight hours, it possesses a unique charm. Weather in December »