Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
September
Weather in September
Temperature
September's advent presents an average high-temperature of a hot 31.7°C (89.1°F), indicating a slight variation from the conditions of the previous month. Throughout September, Altaneira acknowledges a distinct difference between its daytime highs and the steady low average of 18.8°C (65.8°F).Heat index
In September, the average heat index is evaluated at a sweltering 35°C (95°F). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.Evaluating the heat index requires understanding its values in the shade and with gentle winds. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', arises from combining readings of air temperature and relative moisture content. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. The body is at risk of dehydration and related complications when it fails to shed excessive heat.
Humidity
In Altaneira, the average relative humidity in September is 54%.Rainfall
In September, the rain falls for 3 days. Throughout September, 3mm (0.12") of precipitation is accumulated. Throughout the year, there are 172.3 rainfall days, and 764mm (30.08") of precipitation is accumulated.Daylight
The average length of the day in September is 12h and 4min.On the first day of the month, sunrise is at 05:39 and sunset at 17:38. On the last day of September, sunrise is at 05:23 and sunset at 17:33 -03.
Sunshine
September has the most sunshine of the year, with an average of 9.5h of sunshine.UV index
September through November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 7 during September translates into the following recommendations:
Shun overexposure. Protection from sun ravages is indispensable. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the average humidity in September?
How many days does it rain in September?
How many hours of daylight does Altaneira have in September?
When is the sunrise / sunset in September?
What month has the most sunshine?
How long on average sun shines in September?
What is the month with the highest UV index?
What is the UV index intensity in September in Altaneira?
Average temperature in September
Altaneira, Brazil
- Average high temperature in September: 31.7°C
The warmest months (with the highest average high temperature) are October and November (32.5°C).
The months with the lowest average high temperature are June and July (28°C).
- Average low temperature in September: 18.8°C
The month with the highest average low temperature is November (21.5°C).
The coldest month (with the lowest average low temperature) is August (17.1°C).
Average pressure in September
Altaneira, Brazil
- Average pressure in September: 1013.9mbar
The month with the highest atmospheric pressure is July (1015.6mbar).
The month with the lowest atmospheric pressure is November (1010.3mbar).
Average wind speed in September
Altaneira, Brazil
- Average wind speed in September: 17.1km/h
The windiest month (with the highest average wind speed) is July (18.5km/h).
The calmest month (with the lowest average wind speed) is March (9.4km/h).
Average humidity in September
Altaneira, Brazil
- Average humidity in September: 54%
The month with the highest relative humidity is April (78%).
The month with the lowest relative humidity is October (52%).
Average rainfall in September
Altaneira, Brazil
- Average rainfall in September: 3mm
The wettest month (with the highest rainfall) is March (154mm).
The driest month (with the least rainfall) is August (2mm).
Average rainfall days in September
Altaneira, Brazil
- Average rainfall days in September: 3 days
The month with the highest number of rainy days is March (26.6 days).
The month with the least rainy days is August (2.5 days).
Average daylight in September /
Average sunshine in September
Altaneira, Brazil
- Average daylight in September: 12h and 1min
The month with the longest days is December (Average daylight: 12h and 30min).
The month with the shortest days is June (Average daylight: 11h and 42min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is September (Average sunshine: 9h and 30min).
The month with the least sunshine is March (Average sunshine: 6h and 48min).
Average sunshine days in September
Altaneira, Brazil
- Average sunshine days in September: 24.4 days
The month with the most sunshine days is August (24.5 days).
The month with the least sunshine days is March (2.8 days).
Average UV index in September
Altaneira, Brazil
- Average UV index in September: 7
The months with the highest UV index are September, October and November (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August and December (UV index 6).
Average cloud cover in September
Altaneira, Brazil
- Average cloud cover in September: 20
The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is September (Cloud cover 20).
Average visibility in September
Altaneira, Brazil
- Average visibility in September: 10km
The months with the highest visibility are June, July, August, September, October, November and December (10km).
The months with the lowest visibility are March and April (8km).
