Manaus
Brazil
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Manaus, Brazil

Cloudy skies above the Amazon Theatre building in Manaus, Brazil
Cloudy skies above the Amazon Theatre building in Manaus, Brazil
The first month of the spring, September, is also a hot month in Manaus, Brazil, with temperature in the range of an average low of 23.5°C (74.3°F) and an average high of 32.9°C (91.2°F).

Temperature

The warmest month is September, with an average high-temperature of 32.9°C (91.2°F) and an average low-temperature of 23.5°C (74.3°F).

Heat index

In September, the average heat index is calculated to a burning hot 46.3°C (115.3°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, differences in body mass, height, and shape, metabolic differences), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

August and September, with an average relative humidity of 77%, are the least humid months.

Rainfall

In September, in Manaus, Brazil, the rain falls for 6 days. Throughout September, 73.7mm (2.9") of precipitation is accumulated. In Manaus, during the entire year, the rain falls for 160 days and collects up to 2307.3mm (90.8") of precipitation.

Daylight

In Manaus, the average length of the day in September is 12.1h.

Sunshine

In Manaus, the average sunshine is 6.7h.

UV index

January through May, August through December, with an average maximum UV index of 12, are months with the highest UV index in Manaus. A UV Index value of 11, and more, symbolizes an extreme health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 12 in September transform into the following instructions:
Take all necessary precautions, as unprotected skin can burn in minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim.

What is the warmest month in Manaus?

With an average high-temperature of 32.9°C (91.2°F) and an average low-temperature of 23.5°C (74.3°F), September is the warmest month in Manaus.

What is the temperature in September in Manaus?

In September, the average high-temperature is 32.9°C (91.2°F), and the average low-temperature is 23.5°C (74.3°F). In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that calculates temperature value influenced by the moisture in the air, is estimated at 46.3°C (115.3°F).

What is the least humid month in Manaus?

Months with the lowest humidity in Manaus are August and September, with an average relative humidity of 77%.

What is the average humidity in September in Manaus?

In September, the average relative humidity is 77%.

How much does it rain in Manaus in September?

In Manaus, in September, it is raining for 6 days, with typically 73.7mm (2.9") of accumulated precipitation.

What is the average length of the day in September in Manaus?

The average length of the day in September in Manaus, Brazil, is 12.1h.

How long on average sun shines in September in Manaus?

In Manaus, the average sunshine in September is 6.7h.

What is the month with the highest UV index in Manaus?

January through May, August through December, with an average maximum UV index of 12, are months with the highest UV index.

What is the UV index reading in September in Manaus?

In September, the average daily maximum UV index is 12. A UV Index value of 11, and more, symbolizes an ultimate hazard to health from unprotected exposure to the UV radiation.
Average temperature in September - Manaus, Brazil
  • Average high temperature in September: 32.9°C

The warmest month (with the highest average high temperature) is September (32.9°C).
The month with the lowest average high temperature is February (30.4°C).

  • Average low temperature in September: 23.5°C

Months with the highest average low temperature are October and November (23.7°C).
The coldest month (with the lowest average low temperature) is July (22.7°C).

Average humidity in September - Manaus, Brazil
  • Average humidity in September: 77%

The month with the highest relative humidity is March (88%).
Months with the lowest relative humidity are August and September (77%).

Average rainfall in September - Manaus, Brazil
  • Average rainfall in September: 73.7mm

The wettest month (with the highest rainfall) is March (335.4mm).
The driest month (with the lowest rainfall) is August (47.3mm).

Average rainfall days in September - Manaus, Brazil
  • Average rainfall days in September: 6 days

The month with the highest number of rainy days is March (20 days).
Months with the lowest number of rainy days are August and September (6 days).

Average daylight in September / Average sunshine in September - Manaus, Brazil
  • Average daylight in September: 12.1h

Months with the longest days are January, November and December (Average daylight: 12.3h).
The month with shortest days is June (Average daylight: 11.9h).

  • Average sunshine in September: 6.7h

The month with most sunshine is August (Average sunshine: 7.3h).
The month with least sunshine is February (Average sunshine: 3.1h).

Average UV index in September - Manaus, Brazil
  • Average UV index in September: 12

Months with the highest UV index are January, February, March, April, May, August, September, October, November and December (UV index 12).
The month with the lowest UV index is July (UV index 10).