September weather forecast
Gastão, Angola

September, the first month of the spring in Gastão, is still a tropical month, with an average temperature varying between 18°C (64.4°F) and 30.2°C (86.4°F).

Temperature

The transition from August to September brings an average high-temperature of a still hot 30.2°C (86.4°F), barely different from August's 31.3°C (88.3°F). Gastão notes a substantial temperature decline from the daytime peaks throughout September, with an average nighttime temperature of 18°C (64.4°F).

Heat index

The average heat index in September is computed to be a sweltering 36°C (96.8°F). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.
Factoring in the heat index, values are geared towards shaded areas with light breezes. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'feels like', evaluates the perceived heat by adding the effect of moisture in the air. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

In Gastão, the average relative humidity in September is 70%.

Rainfall

In Gastão, in September, during 24.6 rainfall days, 82mm (3.23") of precipitation is typically accumulated. Throughout the year, in Gastão, there are 261.7 rainfall days, and 1536mm (60.47") of precipitation is accumulated.

Daylight

The average length of the day in September in Gastão is 12h and 4min.
On the first day of September, sunrise is at 05:59 and sunset at 17:56. On the last day of the month, sunrise is at 05:42 and sunset at 17:53 WAT.

Sunshine

The month with the most sunshine in Gastão is September, with an average of 8.6h of sunshine.

UV index

April through September, with an average maximum UV index of 6, are months with the highest UV index in Gastão. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The UV index of 6 during September translates into the following guidance:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.