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
The arrival of September brings an average high-temperature of a still moderately hot 27.5°C (81.5°F), subtly diverging from August's 25.3°C (77.5°F). Alterosa reports a substantial plunge from daytime highs during the nights of September, with an average low-temperature of 14.4°C (57.9°F).Heat index
During September, the heat index is evaluated at 29°C (84.2°F). Prolonged exposure and physical activity might induce exhaustion, potentially causing heat cramps.Realize that the values for the heat index are set for shaded places and light winds. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', provides an understanding of perceived warmth by combining temperature and relative humidity. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
Humidity
With an average relative humidity of 66%, September is the least humid month.Rainfall
In Alterosa, Brazil, in September, it is raining for 9.6 days, with typically 45mm (1.77") of accumulated precipitation. Throughout the year, there are 213.8 rainfall days, and 1252mm (49.29") of precipitation is accumulated.Daylight
In Alterosa, the average length of the day in September is 11h and 59min.On the first day of September in Alterosa, sunrise is at 06:13 and sunset at 17:55. On the last day of the month, sunrise is at 05:45 and sunset at 18:02 -03.
Sunshine
The months with the most sunshine are August and September, with an average of 9.1h of sunshine.UV index
January through July, September through December, with an average maximum UV index of 5, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index, 5 during September, leads to the following recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Alterosa in September?
What is the least humid month in Alterosa?
What is the average humidity in September in Alterosa?
How many days does it rain in September in Alterosa?
How many hours of daylight does Alterosa have in September?
When is the sunrise / sunset in September in Alterosa?
What are the months with the most sunshine in Alterosa?
How long on average sun shines in September in Alterosa?
What is the month with the lowest UV index in Alterosa?
How high is the UV index in September in Alterosa?
Average temperature in September
Alterosa, Brazil
- Average high temperature in September: 27.5°C
The warmest month (with the highest average high temperature) is October (27.6°C).
The month with the lowest average high temperature is June (21.8°C).
- Average low temperature in September: 14.4°C
The month with the highest average low temperature is December (17.9°C).
The coldest month (with the lowest average low temperature) is July (11.3°C).
Average pressure in September
Alterosa, Brazil
- Average pressure in September: 1017.2mbar
The month with the highest atmospheric pressure is July (1020.6mbar).
The month with the lowest atmospheric pressure is December (1012.7mbar).
Average wind speed in September
Alterosa, Brazil
- Average wind speed in September: 7.7km/h
The windiest months (with the highest average wind speed) are September and October (7.7km/h).
The calmest month (with the lowest average wind speed) is April (5.9km/h).
Average humidity in September
Alterosa, Brazil
- Average humidity in September: 66%
The months with the highest relative humidity are January, March and April (89%).
The month with the lowest relative humidity is September (66%).
Average rainfall in September
Alterosa, Brazil
- Average rainfall in September: 45mm
The wettest month (with the highest rainfall) is January (240mm).
The driest month (with the least rainfall) is July (13mm).
Average rainfall days in September
Alterosa, Brazil
- Average rainfall days in September: 9.6 days
The month with the highest number of rainy days is December (28.9 days).
The month with the least rainy days is August (5.2 days).
Average daylight in September /
Average sunshine in September
Alterosa, 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 1min
The months with the most sunshine are August and September (Average sunshine: 9h and 6min).
The months with the least sunshine are January and December (Average sunshine: 6h and 48min).
Average sunshine days in September
Alterosa, Brazil
- Average sunshine days in September: 19.5 days
The month with the most sunshine days is August (24.1 days).
The month with the least sunshine days is December (1.1 days).
Average UV index in September
Alterosa, Brazil
- Average UV index in September: 5
The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January, February, March, April, May, June, July, September, October, November and December (UV index 5).
Average cloud cover in September
Alterosa, Brazil
- Average cloud cover in September: 26
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in September
Alterosa, Brazil
- Average visibility in September: 9km
The months with the highest visibility are August and September (9km).
The months with the lowest visibility are January, March, April and May (6km).
