September weather forecast
Manaus, Brazil

Cloudy skies above the Amazon Theatre building in Manaus, Brazil
Cloudy skies above the Amazon Theatre building in Manaus, Brazil

Weather in September

September, the first month of the spring in Manaus, is still a hot month, with an average temperature fluctuating between 32.9°C (91.2°F) and 23.5°C (74.3°F).

Temperature

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.

Heat index

In September, the average heat index is appraised at a burning hot 46°C (114.8°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. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, clothing, wind). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. 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 in Manaus.

Rainfall

In Manaus, it is raining for 6 days, with typically 74mm (2.91") of accumulated precipitation. In Manaus, Brazil, during the entire year, the rain falls for 160 days and collects up to 2307mm (90.83") of precipitation.

Daylight

In September, the average length of the day is 12h and 5min.
On the first day of the month, sunrise is at 05:58 and sunset at 18:01. On the last day of September, sunrise is at 05:45 and sunset at 17:54 -04.

Sunshine

In September, the average sunshine in Manaus 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. A UV Index reading of 11, and higher, represents an ultimate health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The daily maximum UV index of 12 in September interpret into the following advice:
Take all required precautions, as unprotected skin and eyes 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise.
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FAQ

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, Brazil.

What is the temperature in September in Manaus?

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. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, is appraised at 46°C (114.8°F).

What is the least humid month in Manaus?

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

What is the average humidity in September in Manaus?

The average relative humidity in September in Manaus is 77%.

How many days does it rain in September in Manaus?

In Manaus, during September, the rain falls for 6 days and regularly aggregates up to 74mm (2.91") of precipitation.

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

The average day length in September in Manaus is 12h and 5min.

When are sunrise and sunset in September in Manaus?

On the first day of September, sunrise is at 05:58 and sunset at 18:01. On the last day of the month, sunrise is at 05:45 and sunset at 17:54 -04.

How many hours of sunshine does Manaus have in September?

The average sunshine duration in September is 6.7h.

What are the months 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 in Manaus, Brazil.

What is the UV index intensity in September in Manaus?

In Manaus, the average daily maximum UV index in September is 12. A UV Index estimate of 11, and higher, represents an extreme health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average sunshine
Average UV index

Average temperature in September
Manaus, Brazil

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

The 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).

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Average humidity in September
Manaus, Brazil

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

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

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Average rainfall in September
Manaus, Brazil

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 least rainfall) is August (47.3mm).

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Average rainfall days in September
Manaus, Brazil

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).
The months with the least rainy days are August and September (6 days).

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Average daylight in September /
Average sunshine in September
Manaus, Brazil

Average daylight in September / Average sunshine in September - Manaus, Brazil
  • Average daylight in September: 12h and 5min

The month with the longest days is December (Average daylight: 12h and 18min).
The month with the shortest days is June (Average daylight: 11h and 57min).

  • Average sunshine in September: 6h and 42min

The month with the most sunshine is August (Average sunshine: 7h and 18min).
The month with the least sunshine is February (Average sunshine: 3h and 6min).

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Average UV index in September
Manaus, Brazil

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

The 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).

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