September weather forecast
Manessa, Angola

The first month of the spring, September, is still a tropical month in Manessa, Angola, with temperature in the range of an average high of 30.2°C (86.4°F) and an average low of 18°C (64.4°F).

Temperature

The introduction of September notes a subtle temperature variation to a still hot 30.2°C (86.4°F) from August's 31.3°C (88.3°F). Manessa witnesses a consistent, sharp contrast from the daytime highs, with an average low-temperature of 18°C (64.4°F) throughout September.

Heat index

During September, the heat index is estimated at a fiery hot 36°C (96.8°F). Exercise enhanced safety steps, heat cramps and heat exhaustion are probable. Heatstroke could be a result of sustained activity.
Heat index data is primarily for areas with shade and subjected to light winds. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', reflects the blend of air temperature and relative humidity to give a temperature impression. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.

Humidity

The average relative humidity in September is 70%.

Rainfall

In September, the rain falls for 24.6 days. Throughout September, 82mm (3.23") of precipitation is accumulated. In Manessa, during the entire year, the rain falls for 261.7 days and collects up to 1536mm (60.47") of precipitation.

Daylight

The average length of the day in September is 12h and 4min.
On the first day of the month, sunrise is at 05:57 and sunset at 17:55. On the last day of September, sunrise is at 05:41 and sunset at 17:51 WAT.

Sunshine

The month with the most sunshine 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. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the average person.
Note: In September, an average UV index of 6 transforms into the following instructions:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Always opt for UVA and UVB-resistant sunglasses on radiant days.