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 observes an average high-temperature of a still moderately hot 27.2°C (81°F), marking an insignificant difference from August's 26.5°C (79.7°F). Atalaia Velha in September experiences a minor decline in temperature, with an average low of 22.7°C (72.9°F) at night.Heat index
For most parts of September, the heat index is appraised at a tropical 30°C (86°F). With prolonged exposure and constant activity, one might feel exhausted and experience heat cramps.Understanding the heat index involves considering values for shaded locales with light wind. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', melds the effects of warmth and moisture to generate a feeling of heat. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. 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 remain especially vital for babies and toddlers. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
Humidity
In Atalaia Velha, the average relative humidity in September is 76%.Rainfall
In Atalaia Velha, in September, it is raining for 19.3 days, with typically 41mm (1.61") of accumulated precipitation. Throughout the year, there are 197.6 rainfall days, and 586mm (23.07") of precipitation is accumulated.Daylight
The average length of the day in September is 12h and 3min.On the first day of September, sunrise is at 05:30 and sunset at 17:25. On the last day of the month, sunrise is at 05:12 and sunset at 17:23 -03.
Sunshine
The average sunshine in September is 7.9h.UV index
January through May, September through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 7 during September translates into the following directions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How much does it rain in September?
How many hours of daylight does Atalaia Velha have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Atalaia Velha have in September?
What are the months with the highest UV index?
What is the UV index reading in September in Atalaia Velha?
Average temperature in September
Atalaia Velha, Brazil
- Average high temperature in September: 27.2°C
The warmest month (with the highest average high temperature) is March (30.8°C).
The months with the lowest average high temperature are July and August (26.5°C).
- Average low temperature in September: 22.7°C
The month with the highest average low temperature is March (25.8°C).
The coldest month (with the lowest average low temperature) is September (22.7°C).
Average pressure in September
Atalaia Velha, Brazil
- Average pressure in September: 1016.4mbar
The month with the highest atmospheric pressure is August (1017.4mbar).
The month with the lowest atmospheric pressure is March (1011.9mbar).
Average wind speed in September
Atalaia Velha, Brazil
- Average wind speed in September: 17.9km/h
The windiest month (with the highest average wind speed) is November (18.8km/h).
The calmest month (with the lowest average wind speed) is May (13.7km/h).
Average humidity in September
Atalaia Velha, Brazil
- Average humidity in September: 76%
The months with the highest relative humidity are June and July (79%).
The months with the lowest relative humidity are January, February, March and December (73%).
Average rainfall in September
Atalaia Velha, Brazil
- Average rainfall in September: 41mm
The wettest month (with the highest rainfall) is July (96mm).
The driest month (with the least rainfall) is November (19mm).
Average rainfall days in September
Atalaia Velha, Brazil
- Average rainfall days in September: 19.3 days
The month with the highest number of rainy days is July (24.9 days).
The month with the least rainy days is March (10.6 days).
Average daylight in September /
Average sunshine in September
Atalaia Velha, Brazil
- Average daylight in September: 12h and 0min
The month with the longest days is December (Average daylight: 12h and 48min).
The month with the shortest days is June (Average daylight: 11h and 30min).
- Average sunshine in September: 7h and 5min
The month with the most sunshine is March (Average sunshine: 8h and 24min).
The month with the least sunshine is October (Average sunshine: 7h and 30min).
Average sunshine days in September
Atalaia Velha, Brazil
- Average sunshine days in September: 5.1 days
The month with the most sunshine days is March (19 days).
The month with the least sunshine days is July (3.8 days).
Average UV index in September
Atalaia Velha, Brazil
- Average UV index in September: 7
The months with the highest UV index are January, February, March, April, May, September, October, November and December (UV index 7).
The months with the lowest UV index are June, July and August (UV index 6).
Average cloud cover in September
Atalaia Velha, Brazil
- Average cloud cover in September: 41
The month with the most cloud cover is July (Cloud cover 46).
The month with the least cloud cover is March (Cloud cover 35).
Average visibility in September
Atalaia Velha, Brazil
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
