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
Ribeira Afonso, São Tomé and Príncipe, marks the onset of September with an average high-temperature of a still warm 25.5°C (77.9°F), subtly divergent from August's 24.8°C (76.6°F). Ribeira Afonso maintains a near steady average temperature of 24.6°C (76.3°F) during the nights of September, demonstrating little drop from daytime highs.Humidity
The months with the highest humidity in Ribeira Afonso are August through October, with an average relative humidity of 83%.Rainfall
In September, the rain falls for 15.8 days. Throughout September, 35mm (1.38") of precipitation is accumulated. Throughout the year, in Ribeira Afonso, São Tomé and Príncipe, there are 241.7 rainfall days, and 1287mm (50.67") of precipitation is accumulated.Daylight
The average length of the day in September is 12h and 7min.On the first day of September in Ribeira Afonso, sunrise is at 05:29 and sunset at 17:36. On the last day of the month, sunrise is at 05:19 and sunset at 17:26 GMT.
Sunshine
In September, the average sunshine is 5.4h.UV index
The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The average daily UV index of 6 in September transforms into the following instructions:
Deflect overexposure. Sun protection is a necessity. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Frequently asked questions
What is the average September temperature in Ribeira Afonso?
What is the most humid month in Ribeira Afonso?
What is the average humidity in September in Ribeira Afonso?
How much does it rain in Ribeira Afonso in September?
What is the average length of the day in September in Ribeira Afonso?
When is the sunrise / sunset in September in Ribeira Afonso?
How long on average sun shines in September in Ribeira Afonso?
What is the UV index intensity in September in Ribeira Afonso?
Average temperature in September
Ribeira Afonso, 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
Ribeira Afonso, 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
Ribeira Afonso, 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
Ribeira Afonso, 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
Ribeira Afonso, 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
Ribeira Afonso, 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
Ribeira Afonso, 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 February and October (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
Ribeira Afonso, 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
Ribeira Afonso, 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
Ribeira Afonso, 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
Ribeira Afonso, 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).
Ribeira Afonso, São Tomé and Príncipe
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