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
São Sebastião da Boa Vista notes an average high-temperature of a still tropical 34.7°C (94.5°F) in September, hardly diverging from August. Throughout the nights in September, an average low-temperature of 23.2°C (73.8°F) is noted.Heat index
For September, the heat index is estimated at a blazing hot 49°C (120.2°F). Be cautious: Heat exhaustion along with heat cramps are predicted. Heatstroke is a possible consequence of continuous physical effort.Realize that the values for the heat index are set for shaded places and light winds. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is found by incorporating humidity levels into the air temperature measurement. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.
Humidity
The average relative humidity in September is 70%.Rainfall
September is the month with the least rainfall. Rain falls for 15.3 days and accumulates 27mm (1.06") of precipitation.Daylight
The average length of the day in September in São Sebastião da Boa Vista is 12h and 6min.On the first day of September, sunrise is at 06:15 and sunset at 18:20. On the last day of the month, sunrise is at 06:04 and sunset at 18:11 -03.
Sunshine
In September, the average sunshine is 8.9h.UV index
May through November, with an average maximum UV index of 7, are months with the highest UV index in São Sebastião da Boa Vista, Brazil. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 7 during September translates into the following directions:
Guard against overexposure. Protection from sun-induced harm is essential. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in São Sebastião da Boa Vista in September?
What is the average humidity in September in São Sebastião da Boa Vista?
What is the driest month in São Sebastião da Boa Vista?
How much does it rain in São Sebastião da Boa Vista in September?
What is the average length of the day in September in São Sebastião da Boa Vista?
When are sunrise and sunset in September in São Sebastião da Boa Vista?
How many hours of sunshine does São Sebastião da Boa Vista have in September?
What is the month with the highest UV index in São Sebastião da Boa Vista?
What is the UV index reading in September in São Sebastião da Boa Vista?
Average temperature in September
São Sebastião da Boa Vista, Brazil
- Average high temperature in September: 34.7°C
The warmest month (with the highest average high temperature) is October (35°C).
The month with the lowest average high temperature is April (30.1°C).
- Average low temperature in September: 23.2°C
The month with the highest average low temperature is November (24.2°C).
The coldest month (with the lowest average low temperature) is July (22.3°C).
Average pressure in September
São Sebastião da Boa Vista, Brazil
- Average pressure in September: 1011.2mbar
The month with the highest atmospheric pressure is July (1012.6mbar).
The month with the lowest atmospheric pressure is November (1008.8mbar).
Average wind speed in September
São Sebastião da Boa Vista, Brazil
- Average wind speed in September: 7.3km/h
The windiest month (with the highest average wind speed) is October (7.6km/h).
The calmest months (with the lowest average wind speed) are April and May (4.9km/h).
Average humidity in September
São Sebastião da Boa Vista, Brazil
- Average humidity in September: 70%
The month with the highest relative humidity is April (90%).
The month with the lowest relative humidity is October (68%).
Average rainfall in September
São Sebastião da Boa Vista, Brazil
- Average rainfall in September: 27mm
The wettest month (with the highest rainfall) is April (329mm).
The driest month (with the least rainfall) is September (27mm).
Average rainfall days in September
São Sebastião da Boa Vista, Brazil
- Average rainfall days in September: 15.3 days
The month with the highest number of rainy days is March (30.5 days).
The month with the least rainy days is September (15.3 days).
Average daylight in September /
Average sunshine in September
São Sebastião da Boa Vista, Brazil
- Average daylight in September: 12h and 1min
The month with the longest days is December (Average daylight: 12h and 12min).
The month with the shortest days is June (Average daylight: 12h and 0min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is November (Average sunshine: 10h and 6min).
The months with the least sunshine are February and March (Average sunshine: 6h and 24min).
Average sunshine days in September
São Sebastião da Boa Vista, Brazil
- Average sunshine days in September: 12 days
The month with the most sunshine days is August (13 days).
The months with the least sunshine days are February and April (0.1 days).
Average UV index in September
São Sebastião da Boa Vista, Brazil
- Average UV index in September: 7
The months with the highest UV index are May, June, July, August, September, October and November (UV index 7).
The months with the lowest UV index are January, February, March, April and December (UV index 6).
Average cloud cover in September
São Sebastião da Boa Vista, Brazil
- Average cloud cover in September: 34
The months with the most cloud cover are March and April (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
São Sebastião da Boa Vista, Brazil
- Average visibility in September: 9km
The months with the highest visibility are October and November (10km).
The months with the lowest visibility are March and April (6km).
