September weather forecastSão Jerônimo da Serra, Brazil

September

Weather in September

September, the first month of the spring in São Jerônimo da Serra, is still a warm month, with an average temperature ranging between max 27.7°C (81.9°F) and min 15.8°C (60.4°F).

Temperature

September's commencement is accompanied by an average high-temperature of a still warm 27.7°C (81.9°F), diverging marginally from August's 25.3°C (77.5°F). São Jerônimo da Serra temperatures generally rest at a low of 15.8°C (60.4°F) during the September nights.

Heat index

In September, the heat index is appraised at a tropical 30°C (86°F). When exposure and activity are sustained, they could induce fatigue, with a chance of heat cramps.
One should consider that heat index numbers are for shaded settings and light wind. 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 'felt air temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.

Humidity

With an average relative humidity of 67%, September is the least humid month.

Rainfall

In São Jerônimo da Serra, Brazil, in September, it is raining for 9.9 days, with typically 55mm (2.17") of accumulated precipitation. In São Jerônimo da Serra, during the entire year, the rain falls for 185.2 days and collects up to 1015mm (39.96") of precipitation.

Daylight

In São Jerônimo da Serra, the average length of the day in September is 11h and 58min.
On the first day of the month, sunrise is at 06:33 and sunset at 18:12. On the last day of September, sunrise is at 06:03 and sunset at 18:22 -03.

Sunshine

The average sunshine in September is 9h.

UV index

The months with the highest UV index are January through March, August through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the average person.
Note: During September, 6 as the daily maximum UV index converts into the following advice:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely.

Updated: Feb 2, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In September, the average high-temperature and low-temperature in São Jerônimo da Serra, Brazil, are 27.7°C (81.9°F) and 15.8°C (60.4°F) respectively. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in September is appraised at 30°C (86°F).

The least humid month in São Jerônimo da Serra is September, with an average relative humidity of 67%.

The average relative humidity in September in São Jerônimo da Serra, Brazil, is 67%.

In São Jerônimo da Serra, during September, the rain falls for 9.9 days and regularly aggregates up to 55mm (2.17") of precipitation.

In September, the average day length in São Jerônimo da Serra, Brazil, is 11h and 58min.

In September, on the first day of the month, sunrise is at 06:33 and sunset at 18:12. On the last day of the month, in São Jerônimo da Serra, Brazil, sunrise is at 06:03 and sunset at 18:22 -03.

In September, the average sunshine duration in São Jerônimo da Serra is 9h.

The months with the highest UV index in São Jerônimo da Serra are January through March, August through December, with an average maximum UV index of 6.

In September, the average daily maximum UV index in São Jerônimo da Serra, Brazil, is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

25.3°C

27.7°C

28.8°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

12km/h

11.7km/h

11.6km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

22.1

18.3

13.7

Average UV index

Average cloud cover

Average visibility

Average temperature in September
São Jerônimo da Serra, Brazil

Average high temperature in September: 27.7°C

The warmest month (with the highest average high temperature) is October (28.8°C).
The month with the lowest average high temperature is June (21.7°C).

Average low temperature in September: 15.8°C

The month with the highest average low temperature is February (19.3°C).
The coldest month (with the lowest average low temperature) is July (12.8°C).

Average pressure in September
São Jerônimo da Serra, Brazil

Average pressure in September: 1015.3mbar

The month with the highest atmospheric pressure is July (1019mbar).
The month with the lowest atmospheric pressure is December (1010.6mbar).

Average wind speed in September
São Jerônimo da Serra, Brazil

Average wind speed in September: 11.2km/h

The windiest months (with the highest average wind speed) are August and September (11.2km/h).
The calmest month (with the lowest average wind speed) is February (8.5km/h).

Average humidity in September
São Jerônimo da Serra, Brazil

Average humidity in September: 67%

The months with the highest relative humidity are January and June (87%).
The month with the lowest relative humidity is September (67%).

Average rainfall in September
São Jerônimo da Serra, Brazil

Average rainfall in September: 55mm

The wettest month (with the highest rainfall) is January (137mm).
The driest month (with the least rainfall) is August (49mm).

Average rainfall days in September
São Jerônimo da Serra, Brazil

Average rainfall days in September: 9.9 days

The month with the highest number of rainy days is January (23.2 days).
The month with the least rainy days is August (8 days).

Average daylight in September /
Average sunshine in September
São Jerônimo da Serra, Brazil

Average daylight in September: 12h and 0min

The month with the longest days is December (Average daylight: 13h and 36min).
The month with the shortest days is June (Average daylight: 10h and 42min).

Average sunshine in September: 9h and 0min

The month with the most sunshine is August (Average sunshine: 9h and 12min).
The month with the least sunshine is January (Average sunshine: 7h and 12min).

Average sunshine days in September
São Jerônimo da Serra, Brazil

Average sunshine days in September: 18.3 days

The month with the most sunshine days is August (22.1 days).
The month with the least sunshine days is February (4.9 days).

Average UV index in September
São Jerônimo da Serra, Brazil

Average UV index in September: 6

The months with the highest UV index are January, February, March, August, September, October, November and December (UV index 6).
The month with the lowest UV index is May (UV index 4).