September weather forecastPiau, Brazil

September

Weather in September

The first month of the spring, September, is also a moderately hot month in Piau, Brazil, with an average temperature varying between 14.2°C (57.6°F) and 25.1°C (77.2°F).

Temperature

In Piau, September's average high-temperature stands at a still warm 25.1°C (77.2°F), closely related to the preceding month. Piau experiences an average low-temperature reading of 14.2°C (57.6°F) throughout September.

Humidity

September is the least humid month, with an average relative humidity of 76%.

Rainfall

In Piau, during September, the rain falls for 13.3 days and regularly aggregates up to 53mm (2.09") of precipitation. Throughout the year, there are 235.4 rainfall days, and 1316mm (51.81") of precipitation is accumulated.

Daylight

In September, the average length of the day in Piau is 11h and 59min.
On the first day of the month, sunrise is at 06:01 and sunset at 17:44. On the last day of September, sunrise is at 05:34 and sunset at 17:51 -03.

Sunshine

August and September, with an average of 8h of sunshine, are months with the most sunshine in Piau, Brazil.

UV index

The months with the highest UV index in Piau are January through December, with an average maximum UV index of 5. The months with the lowest UV index in Piau, Brazil, are January through December, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.
Note: In September, a daily UV index of 5 turns into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.

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

Frequently asked questions

September temperatures in Piau, Brazil, vary between a high-temperature of 25.1°C (77.2°F) and a low-temperature of 14.2°C (57.6°F).

The least humid month in Piau is September, with an average relative humidity of 76%.

In September, the average relative humidity is 76%.

In Piau, Brazil, during September, the rain falls for 13.3 days and regularly aggregates up to 53mm (2.09") of precipitation.

In September, the average day length in Piau, Brazil, is 11h and 59min.

In September, on the first day of the month, sunrise is at 06:01 and sunset at 17:44. On the last day of the month, in Piau, sunrise is at 05:34 and sunset at 17:51 -03.

The months with the most sunshine in Piau, Brazil, are August and September, with an average of 8h of sunshine.

In Piau, the average sunshine duration in September is 8h.

The months with the highest UV index are January through December, with an average maximum UV index of 5.

The months with the lowest UV index in Piau, Brazil, are January through December, with an average maximum UV index of 5.

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health risk 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

23.1°C

25.1°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

8.6km/h

8.7km/h

9km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

18.6

13.6

7.6

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Piau, Brazil

Average high temperature in September: 25.1°C

The warmest month (with the highest average high temperature) is February (25.6°C).
The month with the lowest average high temperature is June (20.9°C).

Average low temperature in September: 14.2°C

The months with the highest average low temperature are January and December (17.6°C).
The coldest month (with the lowest average low temperature) is July (12°C).

Average pressure in September
Piau, Brazil

Average pressure in September: 1018.1mbar

The month with the highest atmospheric pressure is July (1021mbar).
The month with the lowest atmospheric pressure is December (1012.8mbar).

Average wind speed in September
Piau, Brazil

Average wind speed in September: 8.3km/h

The windiest month (with the highest average wind speed) is September (8.3km/h).
The calmest month (with the lowest average wind speed) is April (6km/h).

Average humidity in September
Piau, Brazil

Average humidity in September: 76%

The months with the highest relative humidity are March and April (92%).
The month with the lowest relative humidity is September (76%).

Average rainfall in September
Piau, Brazil

Average rainfall in September: 53mm

The wettest month (with the highest rainfall) is December (251mm).
The driest month (with the least rainfall) is July (14mm).

Average rainfall days in September
Piau, Brazil

Average rainfall days in September: 13.3 days

The month with the highest number of rainy days is December (29.1 days).
The month with the least rainy days is August (9.3 days).

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

Average daylight in September: 12h and 0min

The month with the longest days is December (Average daylight: 13h and 24min).
The month with the shortest days is June (Average daylight: 10h and 48min).

Average sunshine in September: 8h and 0min

The months with the most sunshine are August and September (Average sunshine: 8h and 0min).
The month with the least sunshine is November (Average sunshine: 5h and 24min).

Average sunshine days in September
Piau, Brazil

Average sunshine days in September: 13.6 days

The month with the most sunshine days is August (18.6 days).
The month with the least sunshine days is December (1.2 days).

Average UV index in September
Piau, Brazil

Average UV index in September: 5

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