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 sea temperature 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 shift into September finds São Sebastião at an average high-temperature of a still pleasant 22.3°C (72.1°F), closely comparable to August's conditions. September nighttime temperatures in São Sebastião, Brazil, hover close to the daytime peak with an average of 18.5°C (65.3°F).Humidity
The average relative humidity in September in São Sebastião is 82%.Rainfall
In São Sebastião, during September, the rain falls for 14.6 days and regularly aggregates up to 46mm (1.81") of precipitation. In São Sebastião, Brazil, during the entire year, the rain falls for 210.2 days and collects up to 818mm (32.2") of precipitation.Sea temperature
With an average sea temperature of 21.2°C (70.2°F), September is the month with the coldest seawater in São Sebastião.Note: For most people, a water temperature of 21.2°C (70.2°F) is not conducive to enjoyable swimming. Breathing control becomes harder as the water temperature dips below 21°C (69.8°F).
Daylight
In September, the average length of the day in São Sebastião is 11h and 58min.On the first day of September in São Sebastião, sunrise is at 06:11 and sunset at 17:51. On the last day of the month, sunrise is at 05:42 and sunset at 18:00 -03.
Sunshine
In São Sebastião, the average sunshine in September is 7.5h.UV index
April, May, July through September, with an average maximum UV index of 5, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 5 during September leads to these instructions:
Heed the precautions - It is counselled to guard against solar damage. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Attention! UV strength is notably upped by the reflection of sand and water.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in São Sebastião in September?
What is the average humidity in September in São Sebastião?
How much does it rain in São Sebastião in September?
When is the sea coldest in São Sebastião?
What is the sea water temperature in September in São Sebastião?
How many hours of daylight does São Sebastião have in September?
When are sunrise and sunset in September in São Sebastião?
How many hours of sunshine does São Sebastião have in September?
What are the months with the lowest UV index in São Sebastião?
What is the UV index intensity in September in São Sebastião?
Average temperature in September
São Sebastião, Brazil
- Average high temperature in September: 22.3°C
The warmest month (with the highest average high temperature) is February (27°C).
The months with the lowest average high temperature are July and August (21.7°C).
- Average low temperature in September: 18.5°C
The month with the highest average low temperature is February (23.3°C).
The coldest months (with the lowest average low temperature) are July and August (17.8°C).
Average pressure in September
São Sebastião, Brazil
- Average pressure in September: 1017.4mbar
The month with the highest atmospheric pressure is July (1020.1mbar).
The month with the lowest atmospheric pressure is December (1011.8mbar).
Average wind speed in September
São Sebastião, Brazil
- Average wind speed in September: 13.8km/h
The windiest months (with the highest average wind speed) are August and September (13.8km/h).
The calmest months (with the lowest average wind speed) are January and February (11.2km/h).
Average humidity in September
São Sebastião, Brazil
- Average humidity in September: 82%
The month with the highest relative humidity is November (86%).
The month with the lowest relative humidity is August (80%).
Average rainfall in September
São Sebastião, Brazil
- Average rainfall in September: 46mm
The wettest month (with the highest rainfall) is February (133mm).
The driest month (with the least rainfall) is August (37mm).
Average rainfall days in September
São Sebastião, Brazil
- Average rainfall days in September: 14.6 days
The month with the highest number of rainy days is January (24.1 days).
The month with the least rainy days is August (10.8 days).
Average sea temperature in September
São Sebastião, Brazil
- Average sea temperature in September: 21.2°C
The best month for swimming (with the highest average sea temperature) is February (26.5°C).
The coldest month (with the lowest average sea temperature) is September (21.2°C).
Average daylight in September /
Average sunshine in September
São Sebastião, Brazil
- Average daylight in September: 12h and 0min
The month with the longest days is December (Average daylight: 13h and 36min).
The month with the shortest days is June (Average daylight: 10h and 42min).
- Average sunshine in September: 7h and 3min
The months with the most sunshine are February and May (Average sunshine: 8h and 6min).
The months with the least sunshine are October and November (Average sunshine: 7h and 0min).
Average sunshine days in September
São Sebastião, Brazil
- Average sunshine days in September: 11.7 days
The month with the most sunshine days is August (17.4 days).
The month with the least sunshine days is January (4.5 days).
Average UV index in September
São Sebastião, Brazil
- Average UV index in September: 5
The month with the highest UV index is January (UV index 7).
The months with the lowest UV index are April, May, July, August and September (UV index 5).
Average cloud cover in September
São Sebastião, Brazil
- Average cloud cover in September: 40
The month with the most cloud cover is November (Cloud cover 49).
The months with the least cloud cover are June, July and August (Cloud cover 34).
Average visibility in September
São Sebastião, Brazil
- 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).
