September weather forecastSão Luís do Quitunde, Brazil
September
Weather in September
The first month of the spring, September, is still a warm month in São Luís do Quitunde, Brazil, with an average temperature fluctuating between 27.1°C (80.8°F) and 21.1°C (70°F).Temperature
The start of September sees the average high-temperature at a still warm 27.1°C (80.8°F), showing little difference from August's 26.3°C (79.3°F). During September, São Luís do Quitunde records a consistent average nighttime temperature of 21.1°C (70°F).Heat index
September's average heat index is computed to be a tropical 30°C (86°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.Observations indicate that the heat index values are for shady locations with light wind. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. 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
The average relative humidity in September in São Luís do Quitunde, Brazil, is 81%.Rainfall
In September, the rain falls for 21.8 days. Throughout September, 37mm (1.46") of precipitation is accumulated. In São Luís do Quitunde, during the entire year, the rain falls for 256.6 days and collects up to 686mm (27.01") of precipitation.Daylight
In September, the average length of the day is 12h and 4min.On the first day of September, sunrise is at 05:23 and sunset at 17:20. On the last day of the month, sunrise is at 05:06 and sunset at 17:17 -03.
Sunshine
The average sunshine in September is 7.3h.UV index
April through September, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 6 suggests these recommendations:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
São Luís do Quitunde, Brazil
- Average high temperature in September: 27.1°C
The warmest month (with the highest average high temperature) is March (31.3°C).
The months with the lowest average high temperature are July and August (26.3°C).
- Average low temperature in September: 21.1°C
The month with the highest average low temperature is March (24°C).
The coldest month (with the lowest average low temperature) is August (20.8°C).
Average pressure in September
São Luís do Quitunde, Brazil
- Average pressure in September: 1016.4mbar
The month with the highest atmospheric pressure is August (1017.2mbar).
The month with the lowest atmospheric pressure is March (1012.2mbar).
Average wind speed in September
São Luís do Quitunde, Brazil
- Average wind speed in September: 12.1km/h
The windiest month (with the highest average wind speed) is November (13.4km/h).
The calmest month (with the lowest average wind speed) is May (8.9km/h).
Average humidity in September
São Luís do Quitunde, Brazil
- Average humidity in September: 81%
The months with the highest relative humidity are June and July (84%).
The months with the lowest relative humidity are March and December (74%).
Average rainfall in September
São Luís do Quitunde, Brazil
- Average rainfall in September: 37mm
The wettest month (with the highest rainfall) is July (105mm).
The driest month (with the least rainfall) is November (21mm).
Average rainfall days in September
São Luís do Quitunde, Brazil
- Average rainfall days in September: 21.8 days
The month with the highest number of rainy days is July (26.5 days).
The month with the least rainy days is November (15.3 days).
Average daylight in September /
Average sunshine in September
São Luís do Quitunde, Brazil
- Average daylight in September: 12h and 6min
The month with the longest days is December (Average daylight: 12h and 42min).
The month with the shortest days is June (Average daylight: 11h and 36min).
- Average sunshine in September: 7h and 18min
The month with the most sunshine is March (Average sunshine: 8h and 6min).
The month with the least sunshine is July (Average sunshine: 6h and 54min).
Average sunshine days in September
São Luís do Quitunde, Brazil
- Average sunshine days in September: 5.1 days
The month with the most sunshine days is December (7 days).
The month with the least sunshine days is June (2.3 days).
Average UV index in September
São Luís do Quitunde, Brazil
- Average UV index in September: 6
The months with the highest UV index are January, February, March, October, November and December (UV index 7).
The months with the lowest UV index are April, May, June, July, August and September (UV index 6).
Average cloud cover in September
São Luís do Quitunde, Brazil
- Average cloud cover in September: 47
The month with the most cloud cover is July (Cloud cover 52).
The month with the least cloud cover is March (Cloud cover 39).
Average visibility in September
São Luís do Quitunde, Brazil
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, June, August, September, October, November and December (10km).
The months with the lowest visibility are May and July (9km).
