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 warmest period is September, when temperatures fluctuate between an average high of 36.2°C (97.2°F) and a low of 22.6°C (72.7°F).Heat index
The heat index value for September is computed to be an extremely hot 44°C (111.2°F). Caution: Heat cramps along with heat exhaustion are expected. Sustained activity could lead to heatstroke.Heat index readings emphasize conditions of light breezes and shaded spots. Being exposed to direct sunshine might trigger a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', evaluates the perceived heat by adding the effect of moisture in the air. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.
Humidity
The months with the lowest humidity in João Lisboa are August and September, with an average relative humidity of 51%.Rainfall
In September, in João Lisboa, Brazil, the rain falls for 7.8 days. Throughout September, 9mm (0.35") of precipitation is accumulated. Throughout the year, there are 228.6 rainfall days, and 1158mm (45.59") of precipitation is accumulated.Daylight
In September, the average length of the day in João Lisboa is 12h and 5min.On the first day of the month, sunrise is at 06:09 and sunset at 18:09. On the last day of September, in João Lisboa, sunrise is at 05:54 and sunset at 18:04 -03.
Sunshine
In September, the average sunshine is 10.3h.UV index
The months with the highest UV index are April, May, July through October, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.Note: The daily high UV index of 7 during September translates into the following recommendations:
Prevent overexposure. Protection from the sun's harmful effects is needed. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Frequently asked questions
What is the warmest month in João Lisboa?
How hot does it get in João Lisboa in September?
What are the least humid months in João Lisboa?
What is the average humidity in September in João Lisboa?
How much does it rain in João Lisboa in September?
How many hours of daylight does João Lisboa have in September?
When is the sunrise / sunset in September in João Lisboa?
How long on average sun shines in September in João Lisboa?
When is the highest UV index in João Lisboa?
What is the UV index reading in September in João Lisboa?
Average temperature in September
João Lisboa, Brazil
- Average high temperature in September: 36.2°C
The warmest month (with the highest average high temperature) is September (36.2°C).
The month with the lowest average high temperature is February (30.3°C).
- Average low temperature in September: 22.6°C
The month with the highest average low temperature is October (23.5°C).
The coldest month (with the lowest average low temperature) is July (20.3°C).
Average pressure in September
João Lisboa, Brazil
- Average pressure in September: 1011.1mbar
The months with the highest atmospheric pressure are June and July (1013.1mbar).
The month with the lowest atmospheric pressure is November (1009.1mbar).
Average wind speed in September
João Lisboa, Brazil
- Average wind speed in September: 7.1km/h
The windiest month (with the highest average wind speed) is August (7.3km/h).
The calmest months (with the lowest average wind speed) are March and April (4.5km/h).
Average humidity in September
João Lisboa, Brazil
- Average humidity in September: 51%
The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are August and September (51%).
Average rainfall in September
João Lisboa, Brazil
- Average rainfall in September: 9mm
The wettest month (with the highest rainfall) is February (206mm).
The driest month (with the least rainfall) is August (2mm).
Average rainfall days in September
João Lisboa, Brazil
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is January (30.2 days).
The month with the least rainy days is August (2.6 days).
Average daylight in September /
Average sunshine in September
João Lisboa, 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 48min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is October (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 24min).
Average sunshine days in September
João Lisboa, Brazil
- Average sunshine days in September: 19.3 days
The month with the most sunshine days is August (26.6 days).
The month with the least sunshine days is January (0.3 days).
Average UV index in September
João Lisboa, Brazil
- Average UV index in September: 7
The months with the highest UV index are April, May, July, August, September and October (UV index 7).
The months with the lowest UV index are January, February, March, June, November and December (UV index 6).
Average cloud cover in September
João Lisboa, Brazil
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in September
João Lisboa, Brazil
- Average visibility in September: 10km
The months with the highest visibility are July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April and May (7km).
João Lisboa, Brazil
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