September weather forecastMendonça, Brazil

September

Weather in September

The first month of the spring, September, is a hot month in Mendonça, Brazil, with an average temperature fluctuating between 19°C (66.2°F) and 32.2°C (90°F).

Temperature

September, marked by an average high-temperature of 32.2°C (90°F) and a low-temperature of 19°C (66.2°F), is the warmest month.

Heat index

The heat index in September is evaluated at a sweltering 35°C (95°F). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.
Always consider that heat index estimations are for light winds and places in the shade. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

August and September, with an average relative humidity of 52%, are the least humid months.

Rainfall

In Mendonça, in September, during 8.9 rainfall days, 51mm (2.01") of precipitation is typically accumulated. Throughout the year, there are 208.9 rainfall days, and 1257mm (49.49") of precipitation is accumulated.

Daylight

In September, the average length of the day is 11h and 59min.
On the first day of the month, sunrise is at 06:26 and sunset at 18:09. On the last day of September, sunrise is at 05:59 and sunset at 18:16 -03.

Sunshine

In Mendonça, the average sunshine in September is 9.4h.

UV index

The months with the highest UV index are January, March through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. 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.

Updated: Aug 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

September is the warmest month of the year, registering average temperatures as high as 32.2°C (90°F) and as low as 19°C (66.2°F).

An average high-temperature, in September, in Mendonça, is 32.2°C (90°F) and the average low-temperature is 19°C (66.2°F). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in September is evaluated at 35°C (95°F).

The months with the lowest humidity are August and September, with an average relative humidity of 52%.

In Mendonça, the average relative humidity in September is 52%.

In September, the rain falls for 8.9 days. Throughout September, 51mm (2.01") of precipitation is accumulated.

In Mendonça, Brazil, the average day length in September is 11h and 59min.

In September, on the first day of the month, sunrise is at 06:26 and sunset at 18:09. On the last day of the month, sunrise is at 05:59 and sunset at 18:16 -03.

The average sunshine duration in September is 9.4h.

January, March through December, with an average maximum UV index of 6, are months with the highest UV index.

In Mendonça, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

29.8°C

32.2°C

31.8°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

11km/h

10.7km/h

10.6km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

26.9

11.4

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Mendonça, Brazil

Average high temperature in September: 32.2°C

The warmest month (with the highest average high temperature) is September (32.2°C).
The month with the lowest average high temperature is June (25.3°C).

Average low temperature in September: 19°C

The month with the highest average low temperature is December (21.2°C).
The coldest month (with the lowest average low temperature) is June (15.5°C).

Average pressure in September
Mendonça, Brazil

Average pressure in September: 1013.9mbar

The month with the highest atmospheric pressure is July (1017.9mbar).
The months with the lowest atmospheric pressure are November and December (1010mbar).

Average wind speed in September
Mendonça, Brazil

Average wind speed in September: 10km/h

The windiest months (with the highest average wind speed) are August and September (10km/h).
The calmest month (with the lowest average wind speed) is February (6.9km/h).

Average humidity in September
Mendonça, Brazil

Average humidity in September: 52%

The month with the highest relative humidity is March (86%).
The months with the lowest relative humidity are August and September (52%).

Average rainfall in September
Mendonça, Brazil

Average rainfall in September: 51mm

The wettest month (with the highest rainfall) is January (224mm).
The driest month (with the least rainfall) is August (9mm).

Average rainfall days in September
Mendonça, Brazil

Average rainfall days in September: 8.9 days

The month with the highest number of rainy days is January (29.6 days).
The month with the least rainy days is August (3.3 days).

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

Average daylight in September: 12h and 0min

The month with the longest days is December (Average daylight: 13h and 24min).
The month with the shortest days is June (Average daylight: 10h and 54min).

Average sunshine in September: 9h and 24min

The month with the most sunshine is August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 7h and 0min).

Average sunshine days in September
Mendonça, Brazil

Average sunshine days in September: 20 days

The month with the most sunshine days is August (26.9 days).
The month with the least sunshine days is January (1.1 days).

Average UV index in September
Mendonça, Brazil

Average UV index in September: 6

The months with the highest UV index are January, March, April, May, June, July, August, September, October, November and December (UV index 6).
The month with the lowest UV index is February (UV index 5).