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
The beginning of September reveals an average high-temperature of a very hot 35.5°C (95.9°F), showing minimal deviation from the previous month. Contrasting the daytime warmth, São Mateus do Maranhão's September nights cool down to an average of 22°C (71.6°F).Heat index
For September, the heat index is appraised at a life-threatening hot 48°C (118.4°F). Be on the lookout: Heat cramps and heat exhaustion are anticipated. Continued exertion can result in heatstroke.Heat index data is primarily for areas with shade and subjected to light winds. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is the outcome of merging air's temperature and its humidity metrics. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Perspiring is a crucial mechanism for the human body, allowing it to release excessive warmth through evaporating sweat. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.
Humidity
With an average relative humidity of 62%, September is the least humid month.Rainfall
The month with the least rainfall is September, when the rain falls for 10.4 days and typically collects 12mm (0.47") of precipitation.Daylight
In September, the average length of the day is 12h and 5min.On the first day of September in São Mateus do Maranhão, sunrise is at 05:56 and sunset at 17:58. On the last day of the month, sunrise is at 05:43 and sunset at 17:51 -03.
Sunshine
September has the most sunshine of the year, with an average of 8.7h of sunshine.UV index
The months with the highest UV index are January, July through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: A typical high UV index of 7 in September suggests the following recommendations:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
How hot does it get in São Mateus do Maranhão in September?
What is the least humid month in São Mateus do Maranhão?
What is the average humidity in September in São Mateus do Maranhão?
What is the driest month in São Mateus do Maranhão?
How many days does it rain in September in São Mateus do Maranhão?
How many hours of daylight does São Mateus do Maranhão have in September?
What time are sunrise and sunset in September in São Mateus do Maranhão?
What month has the most sunshine in São Mateus do Maranhão?
How many hours of sunshine does São Mateus do Maranhão have in September?
When is the highest UV index in São Mateus do Maranhão?
What is the UV index reading in September in São Mateus do Maranhão?
Average temperature in September
São Mateus do Maranhão, Brazil
- Average high temperature in September: 35.5°C
The warmest month (with the highest average high temperature) is October (36°C).
The month with the lowest average high temperature is April (29.9°C).
- Average low temperature in September: 22°C
The months with the highest average low temperature are October and November (23.3°C).
The coldest month (with the lowest average low temperature) is July (20.7°C).
Average pressure in September
São Mateus do Maranhão, Brazil
- Average pressure in September: 1011.4mbar
The month with the highest atmospheric pressure is July (1013mbar).
The month with the lowest atmospheric pressure is November (1009mbar).
Average wind speed in September
São Mateus do Maranhão, Brazil
- Average wind speed in September: 8.1km/h
The windiest month (with the highest average wind speed) is October (8.4km/h).
The calmest month (with the lowest average wind speed) is April (4.9km/h).
Average humidity in September
São Mateus do Maranhão, Brazil
- Average humidity in September: 62%
The month with the highest relative humidity is April (91%).
The month with the lowest relative humidity is September (62%).
Average rainfall in September
São Mateus do Maranhão, Brazil
- Average rainfall in September: 12mm
The wettest month (with the highest rainfall) is March (235mm).
The driest month (with the least rainfall) is September (12mm).
Average rainfall days in September
São Mateus do Maranhão, Brazil
- Average rainfall days in September: 10.4 days
The month with the highest number of rainy days is March (30.3 days).
The month with the least rainy days is August (8.8 days).
Average daylight in September /
Average sunshine in September
São Mateus do Maranhão, Brazil
- Average daylight in September: 12h and 1min
The month with the longest days is December (Average daylight: 12h and 24min).
The month with the shortest days is June (Average daylight: 11h and 54min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is September (Average sunshine: 8h and 42min).
The month with the least sunshine is April (Average sunshine: 5h and 36min).
Average sunshine days in September
São Mateus do Maranhão, Brazil
- Average sunshine days in September: 17.8 days
The month with the most sunshine days is August (20.6 days).
The month with the least sunshine days is March (0.4 days).
Average UV index in September
São Mateus do Maranhão, Brazil
- Average UV index in September: 7
The months with the highest UV index are January, July, August, September, October and November (UV index 7).
The months with the lowest UV index are February, March, April, May, June and December (UV index 6).
Average cloud cover in September
São Mateus do Maranhão, Brazil
- Average cloud cover in September: 29
The month with the most cloud cover is March (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
São Mateus do Maranhão, Brazil
- Average visibility in September: 9km
The month with the highest visibility is October (10km).
The months with the lowest visibility are February, March and April (6km).
São Mateus do Maranhão, Brazil
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