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
Weather in September
Temperature
Stepping into September, Poiso Alto records an average high-temperature of a still warm 25.5°C (77.9°F), almost consistent with August. During September, nights cool slightly to an average low of 24.6°C (76.3°F).Humidity
The months with the highest humidity are August through October, with an average relative humidity of 83%.Rainfall
In Poiso Alto, in September, it is raining for 15.8 days, with typically 35mm (1.38") of accumulated precipitation. Throughout the year, there are 241.7 rainfall days, and 1287mm (50.67") of precipitation is accumulated.Daylight
In Poiso Alto, the average length of the day in September is 12h and 7min.On the first day of September, sunrise is at 05:29 and sunset at 17:37. On the last day of the month, sunrise is at 05:20 and sunset at 17:26 GMT.
Sunshine
In Poiso Alto, the average sunshine in September is 5.4h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 6 in September converts into the following recommendations:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Poiso Alto in September?
What are the most humid months?
What is the average humidity in September?
How much does it rain in September?
How many hours of daylight does Poiso Alto have in September?
When are sunrise and sunset in September in Poiso Alto?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Poiso Alto, São Tomé and Príncipe
- Average high temperature in September: 25.5°C
The warmest month (with the highest average high temperature) is March (28.8°C).
The month with the lowest average high temperature is July (24.5°C).
- Average low temperature in September: 24.6°C
The month with the highest average low temperature is March (27.5°C).
The coldest month (with the lowest average low temperature) is July (23°C).
Average pressure in September
Poiso Alto, São Tomé and Príncipe
- Average pressure in September: 1013.1mbar
The month with the highest atmospheric pressure is July (1014.3mbar).
The month with the lowest atmospheric pressure is February (1009.8mbar).
Average wind speed in September
Poiso Alto, São Tomé and Príncipe
- Average wind speed in September: 16.8km/h
The windiest month (with the highest average wind speed) is July (17.7km/h).
The calmest month (with the lowest average wind speed) is December (10.8km/h).
Average humidity in September
Poiso Alto, São Tomé and Príncipe
- Average humidity in September: 83%
The months with the highest relative humidity are August, September and October (83%).
The month with the lowest relative humidity is March (76%).
Average rainfall in September
Poiso Alto, São Tomé and Príncipe
- Average rainfall in September: 35mm
The wettest month (with the highest rainfall) is November (224mm).
The driest month (with the least rainfall) is July (9mm).
Average rainfall days in September
Poiso Alto, São Tomé and Príncipe
- Average rainfall days in September: 15.8 days
The month with the highest number of rainy days is December (28.6 days).
The month with the least rainy days is June (7.3 days).
Average daylight in September /
Average sunshine in September
Poiso Alto, São Tomé and Príncipe
- Average daylight in September: 12h and 1min
The month with the longest days is June (Average daylight: 12h and 6min).
The months with the shortest days are January, November and December (Average daylight: 12h and 6min).
- Average sunshine in September: 5h and 2min
The month with the most sunshine is February (Average sunshine: 8h and 36min).
The month with the least sunshine is August (Average sunshine: 5h and 0min).
Average sunshine days in September
Poiso Alto, São Tomé and Príncipe
- Average sunshine days in September: 5.3 days
The month with the most sunshine days is June (16.4 days).
The month with the least sunshine days is December (1.5 days).
Average UV index in September
Poiso Alto, São Tomé and Príncipe
- Average UV index in September: 6
The months with the highest UV index are January, February, March, April, May, October, November and December (UV index 7).
The month with the lowest UV index is July (UV index 5).
Average cloud cover in September
Poiso Alto, São Tomé and Príncipe
- Average cloud cover in September: 62
The month with the most cloud cover is August (Cloud cover 65).
The month with the least cloud cover is February (Cloud cover 37).
Average visibility in September
Poiso Alto, São Tomé and Príncipe
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September and December (10km).
The months with the lowest visibility are October and November (9km).
Poiso Alto, São Tomé and Príncipe
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