September weather forecastCosmópolis, Brazil

September

Weather in September

September, the first month of the spring in Cosmópolis, is still a warm month, with an average temperature fluctuating between 28.4°C (83.1°F) and 16°C (60.8°F).

Temperature

September's arrival brings an average high-temperature of a still warm 28.4°C (83.1°F), slightly deviating from August's 25.9°C (78.6°F). Despite higher daytime temperatures, nighttime averages fall to a refreshing 16°C (60.8°F) in September.

Heat index

The heat index for September is estimated at a hot 31°C (87.8°F). Unrelenting activity during exposure could cause fatigue and potentially lead to heat cramps.
Heat index's context suggests values are appropriate for shady areas and slight breezes. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the 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 primarily vital for children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.

Humidity

August and September, with an average relative humidity of 65%, are the least humid months in Cosmópolis.

Rainfall

In Cosmópolis, during September, the rain falls for 11.1 days and regularly aggregates up to 47mm (1.85") of precipitation. Throughout the year, in Cosmópolis, there are 187.6 rainfall days, and 941mm (37.05") of precipitation is accumulated.

Daylight

In Cosmópolis, the average length of the day in September is 11h and 59min.
On the first day of the month, sunrise is at 06:18 and sunset at 17:58. On the last day of September, in Cosmópolis, sunrise is at 05:49 and sunset at 18:07 -03.

Sunshine

With an average of 9.2h of sunshine, September has the most sunshine of the year.

UV index

The months with the highest UV index are January through March, September through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the UV index of 6 transforms into the following advice:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Experience reduced UV exposure by about half when donning a wide-brim hat.

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

Frequently asked questions

In Cosmópolis, in September, the average high-temperature is 28.4°C (83.1°F), and the average low-temperature is 16°C (60.8°F). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines relative humidity and air temperature, in September is estimated at 31°C (87.8°F).

August and September, with an average relative humidity of 65%, are the least humid months in Cosmópolis, Brazil.

The average relative humidity in September in Cosmópolis, Brazil, is 65%.

In Cosmópolis, Brazil, in September, during 11.1 rainfall days, 47mm (1.85") of precipitation is typically accumulated.

The average day length in September is 11h and 59min.

On the first day of September in Cosmópolis, Brazil, sunrise is at 06:18 and sunset at 17:58. On the last day of the month, sunrise is at 05:49 and sunset at 18:07 -03.

With an average of 9.2h of sunshine, September has the most sunshine of the year in Cosmópolis, Brazil.

The average sunshine duration in September is 9.2h.

January through March, September through December, with an average maximum UV index of 6, are months with the highest UV index.

The average daily maximum UV index in September in Cosmópolis, Brazil, is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

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

Aug

September

Oct

Average high temperature

25.9°C

28.4°C

28.9°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

9.8km/h

10.7km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

24.1

17.7

12.6

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Cosmópolis, Brazil

Average high temperature in September: 28.4°C

The warmest month (with the highest average high temperature) is October (28.9°C).
The month with the lowest average high temperature is June (22.8°C).

Average low temperature in September: 16°C

The month with the highest average low temperature is December (19.5°C).
The coldest month (with the lowest average low temperature) is June (13.3°C).

Average pressure in September
Cosmópolis, Brazil

Average pressure in September: 1016.8mbar

The month with the highest atmospheric pressure is July (1020.2mbar).
The month with the lowest atmospheric pressure is December (1011.9mbar).

Average wind speed in September
Cosmópolis, Brazil

Average wind speed in September: 9.2km/h

The windiest month (with the highest average wind speed) is October (9.6km/h).
The calmest months (with the lowest average wind speed) are February and April (7.3km/h).

Average humidity in September
Cosmópolis, Brazil

Average humidity in September: 65%

The months with the highest relative humidity are January, February and March (84%).
The months with the lowest relative humidity are August and September (65%).

Average rainfall in September
Cosmópolis, Brazil

Average rainfall in September: 47mm

The wettest month (with the highest rainfall) is January (166mm).
The driest month (with the least rainfall) is August (25mm).

Average rainfall days in September
Cosmópolis, Brazil

Average rainfall days in September: 11.1 days

The month with the highest number of rainy days is January (24.7 days).
The month with the least rainy days is August (6.6 days).

Average daylight in September /
Average sunshine in September
Cosmópolis, Brazil

Average daylight in September: 12h and 0min

The month with the longest days is December (Average daylight: 13h and 30min).
The month with the shortest days is June (Average daylight: 10h and 48min).

Average sunshine in September: 9h and 12min

The month with the most sunshine is September (Average sunshine: 9h and 12min).
The month with the least sunshine is January (Average sunshine: 7h and 36min).

Average sunshine days in September
Cosmópolis, Brazil

Average sunshine days in September: 17.7 days

The month with the most sunshine days is August (24.1 days).
The month with the least sunshine days is January (5.3 days).

Average UV index in September
Cosmópolis, Brazil

Average UV index in September: 6

The months with the highest UV index are January, February, March, September, October, November and December (UV index 6).
The months with the lowest UV index are April, May, June, July and August (UV index 5).

Average cloud cover in September
Cosmópolis, Brazil

Average cloud cover in September: 22

The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 19).

Average visibility in September
Cosmópolis, Brazil

Average visibility in September: 9km

The month with the highest visibility is August (10km).
The months with the lowest visibility are January, February, March, April, May, June and December (8km).