September signifies the start of the transition from summer heat to milder climates with a decline in the average high temperature to 30.7°C (87.3°F). Although still arid with very minimal rainfall of only 0mm (0") recorded, the afternoons become considerably cooler. The quantity of daylight reduces gradually indicating the eventual onset of autumn. The weather in September is known for its pleasant evenings that break the monotony of relentless summer heat. A decrease in the UV index suggests the lessened intensity of sun rays, fostering a more hospitable climate.
Temperature
September observes an average high-temperature of a still tropical 30.7°C (87.3°F), marking an insignificant difference from
August's 32.4°C (90.3°F).
Amman reports a sharp reduction in temperature during September, averaging at an enjoyable 16.6°C (61.9°F) at night.
Rainfall
Months with rainfall are
January through
May, September through
December. September is the first month it rains in Amman. Throughout September, in the average 0.1 rainfall days, it receives 0mm (0") of precipitation. In Amman, during the entire year, the rain falls for 51.7 days and collects up to 269mm (10.59") of precipitation.
Daylight
The average length of the day in September in Amman is 12h and 22min.
On the first day of the month, sunrise is at 06:11 and sunset at 19:00. On the last day of September, sunrise is at 06:29 and sunset at 18:22 +03.
Sunshine
In Amman, the average sunshine in September is 10.4h.
UV index
In Amman, the average daily maximum UV index in September is 9. A UV Index of 8 to 10 symbolizes a very high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 9 in September translates into these instructions:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. 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. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Ensure the liberal application and reapplication of a broad-spectrum SPF 30+ sunscreen after each outdoor activity or swim, and every two hours.