September presents itself as the city’s link to the drier last quarter, with rainfall reducing.
Khartoum's arid spell begins to return as the humidity starts a downward trend. Cloud cover reduces noticeably, extending longer bouts of sunshine while the torrential
August rain takes its leave. September sees temperatures from 26.3°C (79.3°F) with highs at 38.7°C (101.7°F), being the testament for the year's downswing. As rainfall continues to dwindle, Khartoum readies for
October's lesser extremes.
Temperature
The onset of September brings with it an average high-temperature of a still fiery hot 38.7°C (101.7°F), showing a negligible variation from the month before. Despite drastic daily temperature oscillations, Khartoum cools down to an average low-temperature of 26.3°C (79.3°F) in September.
Heat index
During September, the heat index is evaluated at a blazing hot 45°C (113°F).
Watchful: Heat cramps and heat exhaustion are predicted. Continued exertion could lead to heatstroke.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', gives a temperature feeling by integrating air temperature and humidity. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.
Humidity
In Khartoum,
Sudan, the average relative humidity in September is 40%.
Rainfall
In Khartoum, Sudan, during September, the rain falls for 3.4 days and regularly aggregates up to 27mm (1.06") of precipitation. In Khartoum, during the entire year, the rain falls for 14.7 days and collects up to 121mm (4.76") of precipitation.
Daylight
In Khartoum, Sudan, the average length of the day in September is 12h and 13min.
On the first day of the month, sunrise is at 05:37 and sunset at 18:02. On the last day of September, in Khartoum, Sudan, sunrise is at 05:39 and sunset at 17:39 CAT.
Sunshine
The average sunshine in September in Khartoum is 10h.
UV index
The months with the highest UV index are
March through September, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an extreme health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum high UV index of 12 in September translates into the following recommendations:
Carry out all vital precautions. Protection from sun exposure is a must. 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. During bright days, sunglasses that offer UVA and UVB defense are recommended. After a swim or outdoor exercise, one should liberally reapply broad-spectrum sunscreen with a sun protection factor of 30 or higher.