September weather forecast
Alcatraz, Cape Verde

englishespañol中文
Share

Weather in September

September marks a definitive transition in weather as Alcatraz makes its way from the warm season to mildly cooler months. Rainfall reaches its peak with an whopping of 50mm (1.97"), the highest in the year. Nevertheless, temperatures remain uniformly high providing a warm ambiance throughout the city. Even with enhanced rainfall, it is seldom a deterrent to enjoy the unique charm of Alcatraz.

Temperature

September in Alcatraz is marked by an average high-temperature of a still moderately hot 28.1°C (82.6°F), almost identical to the preceding month. A consistent average low-temperature of 25.8°C (78.4°F), with a minor variance from the daytime highs, is noted in Alcatraz, Cape Verde, during the nights of September.

Heat index

For September, the heat index is estimated at a tropical 32°C (89.6°F). If exposure and activity persist, fatigue could ensue, possibly leading to heat cramps.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.

Humidity

The months with the highest humidity are June through September, with an average relative humidity of 79%.

Rainfall

September is the month with the most rainfall in Alcatraz. Rain falls for 13.1 days and accumulates 50mm (1.97") of precipitation.

Daylight

In Alcatraz, the average length of the day in September is 12h and 13min.
On the first day of September in Alcatraz, sunrise is at 06:19 and sunset at 18:44. On the last day of the month, sunrise is at 06:22 and sunset at 18:22 -01.

Sunshine

The average sunshine in September is 8h.

UV index

The months with the highest UV index in Alcatraz are August through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 7 in September interprets into the following recommendations:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. 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. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
[Resources]

Frequently asked questions

How hot does it get in Alcatraz in September?

During September, Alcatraz experiences an average high-temperature of 28.1°C (82.6°F) and a low-temperature of 25.8°C (78.4°F). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, in September is estimated at 32°C (89.6°F).

What is the most humid month in Alcatraz?

June through September, with an average relative humidity of 79%, are most humid months.

What is the average humidity in September in Alcatraz?

In September, the average relative humidity in Alcatraz is 79%.

What is the rainiest month in Alcatraz?

September is the month with the most rainfall in Alcatraz. Rain falls for 13.1 days and accumulates 50mm (1.97") of precipitation.

How many days does it rain in September in Alcatraz?

In Alcatraz, in September, it is raining for 13.1 days, with typically 50mm (1.97") of accumulated precipitation.

How many hours of daylight does Alcatraz have in September?

In September, the average day length in Alcatraz, Cape Verde, is 12h and 13min.

When are sunrise and sunset in September in Alcatraz?

On the first day of September, sunrise is at 06:19 and sunset at 18:44. On the last day of the month, sunrise is at 06:22 and sunset at 18:22 -01.

How long on average sun shines in September in Alcatraz?

In Alcatraz, Cape Verde, the average sunshine duration in September is 8h.

What is the month with the highest UV index in Alcatraz?

August through November, with an average maximum UV index of 7, are months with the highest UV index.

What is the UV index reading in September in Alcatraz?

The average daily maximum UV index in September in Alcatraz is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to Sun's UV rays.

Average temperature in September
Alcatraz, Cape Verde

Average temperature in September - Alcatraz, Cape Verde
  • Average high temperature in September: 28.1°C

The warmest month (with the highest average high temperature) is October (28.4°C).
The months with the lowest average high temperature are February and March (23.7°C).

  • Average low temperature in September: 25.8°C

The months with the highest average low temperature are September and October (25.8°C).
The coldest month (with the lowest average low temperature) is February (20.9°C).

[Resources]

Average pressure in September
Alcatraz, Cape Verde

Average pressure in September - Alcatraz, Cape Verde
  • Average pressure in September: 1012.5mbar

The month with the highest atmospheric pressure is January (1015.2mbar).
The month with the lowest atmospheric pressure is September (1012.5mbar).

[Resources]

Average wind speed in September
Alcatraz, Cape Verde

Average wind speed in September - Alcatraz, Cape Verde
  • Average wind speed in September: 16.1km/h

The windiest month (with the highest average wind speed) is February (25.8km/h).
The calmest month (with the lowest average wind speed) is August (14km/h).

[Resources]

Average humidity in September
Alcatraz, Cape Verde

Average humidity in September - Alcatraz, Cape Verde
  • Average humidity in September: 79%

The months with the highest relative humidity are June, July, August and September (79%).
The month with the lowest relative humidity is January (69%).

[Resources]

Average rainfall in September
Alcatraz, Cape Verde

Average rainfall in September - Alcatraz, Cape Verde
  • Average rainfall in September: 50mm

The wettest month (with the highest rainfall) is September (50mm).
The driest months (with the least rainfall) are January, March and May (1mm).

[Resources]

Average rainfall days in September
Alcatraz, Cape Verde

Average rainfall days in September - Alcatraz, Cape Verde
  • Average rainfall days in September: 13.1 days

The month with the highest number of rainy days is September (13.1 days).
The month with the least rainy days is January (0.7 days).

[Resources]

Average daylight in September /
Average sunshine in September
Alcatraz, Cape Verde

Average daylight in September / Average sunshine in September - Alcatraz, Cape Verde
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 13h and 0min).
The month with the shortest days is December (Average daylight: 11h and 12min).

  • Average sunshine in September: 8h and 0min

The month with the most sunshine is May (Average sunshine: 9h and 54min).
The month with the least sunshine is August (Average sunshine: 7h and 0min).

[Resources]

Average sunshine days in September
Alcatraz, Cape Verde

Average sunshine days in September - Alcatraz, Cape Verde
  • Average sunshine days in September: 13.1 days

The months with the most sunshine days are January and May (29.3 days).
The month with the least sunshine days is September (13.1 days).

[Resources]

Average UV index in September
Alcatraz, Cape Verde

Average UV index in September - Alcatraz, Cape Verde
  • Average UV index in September: 7

The months with the highest UV index are August, September, October and November (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July and December (UV index 6).

[Resources]

Average cloud cover in September
Alcatraz, Cape Verde

Average cloud cover in September - Alcatraz, Cape Verde
  • Average cloud cover in September: 44

The month with the most cloud cover is August (Cloud cover 52).
The month with the least cloud cover is May (Cloud cover 13).

[Resources]

Average visibility in September
Alcatraz, Cape Verde

Average visibility in September - Alcatraz, Cape Verde
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

[Resources]

Alcatraz, Cape Verde

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location