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
With the onset of September, São Sebastião do Maranhão's average high-temperature clocks in at a still warm 27.1°C (80.8°F), showing a minor fluctuation from the previous month. Nightly average temperatures in September reveal a significant dip from daytime highs in São Sebastião do Maranhão, registering a consistent a moderate 15°C (59°F).Heat index
In September, the average heat index is evaluated at 29°C (84.2°F). Exhaustion might be the outcome of enduring exposure and continuous activity, with a risk of heat cramps.Factoring in the heat index, values are geared towards shaded areas with light breezes. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'apparent temperature' or 'real feel', melds the effects of warmth and moisture to generate a feeling of heat. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
Humidity
September is the least humid month in São Sebastião do Maranhão, with an average relative humidity of 70%.Rainfall
In São Sebastião do Maranhão, during September, the rain falls for 8.4 days and regularly aggregates up to 22mm (0.87") of precipitation. In São Sebastião do Maranhão, Brazil, during the entire year, the rain falls for 201.3 days and collects up to 1102mm (43.39") of precipitation.Daylight
In September, the average length of the day is 12h and 0min.On the first day of September in São Sebastião do Maranhão, sunrise is at 05:56 and sunset at 17:43. On the last day of the month, sunrise is at 05:32 and sunset at 17:47 -03.
Sunshine
With an average of 8.6h of sunshine, September has the most sunshine of the year in São Sebastião do Maranhão, Brazil.UV index
The months with the highest UV index are January and September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in São Sebastião do Maranhão?
What is the least humid month in São Sebastião do Maranhão?
What is the average humidity in September in São Sebastião do Maranhão?
How many days does it rain in September in São Sebastião do Maranhão?
How many hours of daylight does São Sebastião do Maranhão have in September?
What time are sunrise and sunset in September in São Sebastião do Maranhão?
What month has the most sunshine in São Sebastião do Maranhão?
How many hours of sunshine does São Sebastião do Maranhão have in September?
What are the months with the highest UV index in São Sebastião do Maranhão?
What is the UV index intensity in September in São Sebastião do Maranhão?
Average temperature in September
São Sebastião do Maranhão, Brazil
- Average high temperature in September: 27.1°C
The warmest month (with the highest average high temperature) is October (27.3°C).
The month with the lowest average high temperature is June (22.7°C).
- Average low temperature in September: 15°C
The month with the highest average low temperature is December (18°C).
The coldest month (with the lowest average low temperature) is July (12.6°C).
Average pressure in September
São Sebastião do Maranhão, Brazil
- Average pressure in September: 1017.7mbar
The month with the highest atmospheric pressure is July (1020.6mbar).
The month with the lowest atmospheric pressure is December (1013mbar).
Average wind speed in September
São Sebastião do Maranhão, Brazil
- Average wind speed in September: 8km/h
The windiest months (with the highest average wind speed) are September and October (8km/h).
The calmest months (with the lowest average wind speed) are March and May (5.9km/h).
Average humidity in September
São Sebastião do Maranhão, Brazil
- Average humidity in September: 70%
The months with the highest relative humidity are March and April (89%).
The month with the lowest relative humidity is September (70%).
Average rainfall in September
São Sebastião do Maranhão, Brazil
- Average rainfall in September: 22mm
The wettest month (with the highest rainfall) is December (211mm).
The driest month (with the least rainfall) is July (4mm).
Average rainfall days in September
São Sebastião do Maranhão, Brazil
- Average rainfall days in September: 8.4 days
The month with the highest number of rainy days is December (26.8 days).
The month with the least rainy days is July (5.7 days).
Average daylight in September /
Average sunshine in September
São Sebastião do Maranhão, Brazil
- Average daylight in September: 12h and 0min
The month with the longest days is December (Average daylight: 13h and 12min).
The month with the shortest days is June (Average daylight: 11h and 6min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is September (Average sunshine: 8h and 36min).
The month with the least sunshine is November (Average sunshine: 6h and 6min).
Average sunshine days in September
São Sebastião do Maranhão, Brazil
- Average sunshine days in September: 20 days
The month with the most sunshine days is July (23 days).
The month with the least sunshine days is December (2.8 days).
Average UV index in September
São Sebastião do Maranhão, Brazil
- Average UV index in September: 6
The months with the highest UV index are January and September (UV index 6).
The months with the lowest UV index are February, March, April, May, June, July, August, October, November and December (UV index 5).
Average cloud cover in September
São Sebastião do Maranhão, Brazil
- Average cloud cover in September: 37
The month with the most cloud cover is April (Cloud cover 68).
The month with the least cloud cover is September (Cloud cover 37).
Average visibility in September
São Sebastião do Maranhão, Brazil
- Average visibility in September: 9km
The month with the highest visibility is September (9km).
The months with the lowest visibility are January, February, March, April, May and June (6km).
