September weather forecast
Mecca, Saudi Arabia

September brings a sigh of relief as the scorched city of Mecca, Saudi Arabia starts to cool down. The temperatures slide down the scale, moving closer to comfort. The city senses the arrival of autumn, and a semblance of balance emerges between day and night. Despite less rain and moderate humidity, the weather becomes ideal for outdoor activity.

Temperature

Mecca's September weather showcases an average high temperature of a still scorching 42.8°C (109°F), equivalent to that of August. Despite the drastic temperature difference, Mecca records an average nighttime low of 28.9°C (84°F) throughout September.

Heat index

Throughout September, the heat index is estimated at a burning hot 60°C (140°F). Warning: These weather conditions are evaluated as gravely dangerous, heatstroke is approaching.
Bear in mind that the heat index values are determined for shaded areas and light breezes. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a numerical representation of warmth when taking temperature and moisture levels into account. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

The average relative humidity in September in Mecca is 45%.

Rainfall

In Mecca, Saudi Arabia, during September, the rain falls for 2 days and regularly aggregates up to 5mm (0.2") of precipitation. In Mecca, during the entire year, the rain falls for 22.4 days and collects up to 112mm (4.41") of precipitation.

Daylight

The average length of the day in September in Mecca is 12h and 16min.
On the first day of the month, sunrise is at 06:04 and sunset at 18:36. On the last day of September, sunrise is at 06:11 and sunset at 18:09 +03.

Sunshine

In September, the average sunshine in Mecca is 9.4h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index in Mecca. A UV Index estimate of 11, and higher, represents an excessive health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The daily high UV index of 12 in September translates into this advice:
Adopt every precaution of necessity, unprotected skin and eyes may suffer burns instantly. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. After a swim or outdoor exercise, one should liberally reapply broad-spectrum sunscreen with a sun protection factor of 30 or higher.