September weather forecastRialma, Brazil
September
Weather in September
The first month of the spring, September, is still a tropical month in Rialma, Brazil, with an average temperature varying between 33.5°C (92.3°F) and 20.4°C (68.7°F).Temperature
September, recording an average high temperature of 33.5°C (92.3°F) and a low temperature of 20.4°C (68.7°F), is Rialma's warmest month.Heat index
The heat index value for September is evaluated at a sweltering 35°C (95°F). Adopt special protective actions against heat exhaustion and heat cramps. Long-duration activity risks heatstroke.Heat index data is primarily for areas with shade and subjected to light winds. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is the result of factoring in humidity to the air temperature, indicating perceived warmth. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.
Humidity
September is the least humid month, with an average relative humidity of 40%.Rainfall
In Rialma, in September, it is raining for 7.9 days, with typically 16mm (0.63") of accumulated precipitation. In Rialma, during the entire year, the rain falls for 219.6 days and collects up to 1537mm (60.51") of precipitation.Daylight
The average length of the day in September is 12h and 1min.On the first day of the month, sunrise is at 06:23 and sunset at 18:12. On the last day of September, sunrise is at 06:01 and sunset at 18:15 -03.
Sunshine
The average sunshine in September in Rialma is 9.7h.UV index
The months with the highest UV index in Rialma are August and September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 7 in September translates into these instructions:
Inhibit overexposure. Warding off sun damage is of utmost importance. 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. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rialma, Brazil
- Average high temperature in September: 33.5°C
The warmest month (with the highest average high temperature) is September (33.5°C).
The month with the lowest average high temperature is January (27°C).
- Average low temperature in September: 20.4°C
The month with the highest average low temperature is October (21°C).
The coldest month (with the lowest average low temperature) is July (16.1°C).
Average pressure in September
Rialma, Brazil
- Average pressure in September: 1013.5mbar
The month with the highest atmospheric pressure is July (1017mbar).
The month with the lowest atmospheric pressure is November (1011mbar).
Average wind speed in September
Rialma, Brazil
- Average wind speed in September: 8.1km/h
The windiest month (with the highest average wind speed) is August (8.3km/h).
The calmest month (with the lowest average wind speed) is March (5.2km/h).
Average humidity in September
Rialma, Brazil
- Average humidity in September: 40%
The month with the highest relative humidity is March (88%).
The month with the lowest relative humidity is September (40%).
Average rainfall in September
Rialma, Brazil
- Average rainfall in September: 16mm
The wettest month (with the highest rainfall) is November (266mm).
The driest month (with the least rainfall) is July (1mm).
Average rainfall days in September
Rialma, Brazil
- Average rainfall days in September: 7.9 days
The months with the highest number of rainy days are January and December (29.3 days).
The month with the least rainy days is August (1.3 days).
Average daylight in September /
Average sunshine in September
Rialma, Brazil
- Average daylight in September: 12h and 0min
The month with the longest days is December (Average daylight: 13h and 0min).
The month with the shortest days is June (Average daylight: 11h and 12min).
- Average sunshine in September: 9h and 42min
The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in September
Rialma, Brazil
- Average sunshine days in September: 21.3 days
The month with the most sunshine days is August (29 days).
The months with the least sunshine days are February and November (0.7 days).
Average UV index in September
Rialma, Brazil
- Average UV index in September: 7
The months with the highest UV index are August and September (UV index 7).
The months with the lowest UV index are February and December (UV index 5).
Average cloud cover in September
Rialma, Brazil
- Average cloud cover in September: 15
The month with the most cloud cover is December (Cloud cover 56).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in September
Rialma, Brazil
- Average visibility in September: 10km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January, February and March (7km).
