September weather forecastAltair, Brazil

September

Weather in September

The first month of the spring, September, is a tropical month in Altair, Brazil, with an average temperature varying between 32.2°C (90°F) and 19.2°C (66.6°F).

Temperature

September is the warmest month, with an average high-temperature of 32.2°C (90°F) and an average low-temperature of 19.2°C (66.6°F).

Heat index

The heat index value during September is computed to be a sweltering 35°C (95°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Heat index's context suggests values are appropriate for shady areas and slight breezes. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', unifies temperature and humidity readings to offer a comprehensive feel of warmth. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.

Humidity

August and September, with an average relative humidity of 51%, are the least humid months in Altair.

Rainfall

In Altair, Brazil, in September, during 8.4 rainfall days, 44mm (1.73") of precipitation is typically accumulated. Throughout the year, there are 210.1 rainfall days, and 1237mm (48.7") 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 06:24 and sunset at 18:07. On the last day of September, in Altair, sunrise is at 05:57 and sunset at 18:14 -03.

Sunshine

In September, the average sunshine is 9.5h.

UV index

January, March through December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 6 in September transforms into the following instructions:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.

Updated: Feb 2, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In Altair, September is the month with the highest recorded average temperatures, measuring a high of 32.2°C (90°F) and a low of 19.2°C (66.6°F).

During September, Altair experiences an average high-temperature of 32.2°C (90°F) and a low-temperature of 19.2°C (66.6°F). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines relative humidity and air temperature, in September is computed to be 35°C (95°F).

August and September, with an average relative humidity of 51%, are the least humid months in Altair.

In Altair, the average relative humidity in September is 51%.

In September, in Altair, the rain falls for 8.4 days. Throughout September, 44mm (1.73") of precipitation is accumulated.

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

In September, on the first day of the month, sunrise is at 06:24 and sunset at 18:07. On the last day of the month, in Altair, Brazil, sunrise is at 05:57 and sunset at 18:14 -03.

In Altair, the average sunshine duration in September is 9.5h.

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

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high hazard to health 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

29.6°C

32.2°C

31.5°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

11.1km/h

10.8km/h

10.7km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

26.7

19.2

11.6

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Altair, 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: 19.2°C

The month with the highest average low temperature is December (20.8°C).
The coldest month (with the lowest average low temperature) is June (15.6°C).

Average pressure in September
Altair, Brazil

Average pressure in September: 1014.2mbar

The month with the highest atmospheric pressure is July (1018.2mbar).
The months with the lowest atmospheric pressure are November and December (1010.4mbar).

Average wind speed in September
Altair, Brazil

Average wind speed in September: 10.1km/h

The windiest months (with the highest average wind speed) are August and September (10.1km/h).
The calmest month (with the lowest average wind speed) is February (7km/h).

Average humidity in September
Altair, Brazil

Average humidity in September: 51%

The month with the highest relative humidity is March (87%).
The months with the lowest relative humidity are August and September (51%).

Average rainfall in September
Altair, Brazil

Average rainfall in September: 44mm

The wettest month (with the highest rainfall) is January (214mm).
The driest month (with the least rainfall) is July (9mm).

Average rainfall days in September
Altair, Brazil

Average rainfall days in September: 8.4 days

The month with the highest number of rainy days is January (29.2 days).
The month with the least rainy days is August (3.7 days).

Average daylight in September /
Average sunshine in September
Altair, 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 30min

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 6min).

Average sunshine days in September
Altair, Brazil

Average sunshine days in September: 19.2 days

The month with the most sunshine days is August (26.7 days).
The month with the least sunshine days is December (1.5 days).

Average UV index in September
Altair, 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).