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
Weather in September
Temperature
Rio das Ostras in September witnesses an average high-temperature of a still warm 25.2°C (77.4°F), indicating a slight variation from August's 24.3°C (75.7°F). In the month of September, the temperature generally rests at an average low of 19.3°C (66.7°F).Humidity
August and September, with an average relative humidity of 78%, are the least humid months.Rainfall
In Rio das Ostras, in September, it is raining for 9.9 days, with typically 33mm (1.3") of accumulated precipitation. Throughout the year, there are 179.7 rainfall days, and 674mm (26.54") of precipitation is accumulated.Sea temperature
September is the month with the coldest seawater, with an average sea temperature of 21.9°C (71.4°F).Note: For most individuals, swimming in 21.9°C (71.4°F) is not enjoyable. As the water temperature decreases from 21°C (69.8°F) to 15°C (59°F), breathing control becomes increasingly difficult.
Daylight
The average length of the day in September is 11h and 59min.On the first day of September, sunrise is at 05:57 and sunset at 17:38. On the last day of the month, sunrise is at 05:28 and sunset at 17:46 -03.
Sunshine
In September, the average sunshine is 8.2h.UV index
The months with the lowest UV index are July and September, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.
Frequently asked questions
What are September temperatures in Rio das Ostras?
What are the least humid months in Rio das Ostras?
What is the average humidity in September in Rio das Ostras?
How many days does it rain in September in Rio das Ostras?
What is the month with the coldest sea water in Rio das Ostras?
What is the sea water temperature in September in Rio das Ostras?
How many hours of daylight does Rio das Ostras have in September?
When are sunrise and sunset in September in Rio das Ostras?
How many hours of sunshine does Rio das Ostras have in September?
What is the month with the lowest UV index in Rio das Ostras?
How high is the UV index in September in Rio das Ostras?
Average temperature in September
Rio das Ostras, Brazil
- Average high temperature in September: 25.2°C
The warmest month (with the highest average high temperature) is February (29.1°C).
The month with the lowest average high temperature is June (24.1°C).
- Average low temperature in September: 19.3°C
The month with the highest average low temperature is January (23.1°C).
The coldest month (with the lowest average low temperature) is August (18.3°C).
Average pressure in September
Rio das Ostras, Brazil
- Average pressure in September: 1018.2mbar
The month with the highest atmospheric pressure is July (1020.7mbar).
The month with the lowest atmospheric pressure is December (1012mbar).
Average wind speed in September
Rio das Ostras, Brazil
- Average wind speed in September: 15.8km/h
The windiest month (with the highest average wind speed) is September (15.8km/h).
The calmest month (with the lowest average wind speed) is March (10.9km/h).
Average humidity in September
Rio das Ostras, Brazil
- Average humidity in September: 78%
The months with the highest relative humidity are November and December (84%).
The months with the lowest relative humidity are August and September (78%).
Average rainfall in September
Rio das Ostras, Brazil
- Average rainfall in September: 33mm
The wettest month (with the highest rainfall) is November (108mm).
The driest month (with the least rainfall) is June (18mm).
Average rainfall days in September
Rio das Ostras, Brazil
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is March (21.7 days).
The month with the least rainy days is August (8.9 days).
Average sea temperature in September
Rio das Ostras, Brazil
- Average sea temperature in September: 21.9°C
The best month for swimming (with the highest average sea temperature) is March (25.8°C).
The coldest month (with the lowest average sea temperature) is September (21.9°C).
Average daylight in September /
Average sunshine in September
Rio das Ostras, Brazil
- Average daylight in September: 12h and 0min
The month with the longest days is December (Average daylight: 13h and 30min).
The month with the shortest days is June (Average daylight: 10h and 48min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is February (Average sunshine: 9h and 0min).
The month with the least sunshine is October (Average sunshine: 7h and 36min).
Average sunshine days in September
Rio das Ostras, Brazil
- Average sunshine days in September: 16.9 days
The month with the most sunshine days is August (19.5 days).
The months with the least sunshine days are March and December (5.8 days).
Average UV index in September
Rio das Ostras, 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 July and September (UV index 5).
Average cloud cover in September
Rio das Ostras, Brazil
- Average cloud cover in September: 32
The month with the most cloud cover is November (Cloud cover 48).
The months with the least cloud cover are February, June and July (Cloud cover 27).
Average visibility in September
Rio das Ostras, Brazil
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and December (10km).
The month with the lowest visibility is November (9km).
Rio das Ostras, Brazil
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