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
Amman's weather in September indicates an average high-temperature of a still tropical 30.7°C (87.3°F), nearly consistent with the 32.4°C (90.3°F) of
August. In the face of high daytime temperatures, Amman witnesses a consistent average nighttime low of 16.6°C (61.9°F) during September.
Rainfall
Months with rainfall in Amman are
January through
May, September through
December. September is the first month it rains. 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 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
The average sunshine in September in Amman,
Jordan, is 10.4h.
UV index
The average daily maximum UV index in September is 9. A UV Index estimate of 8 to 10 represents a very high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index, 9 in September, converts into the following recommendations:
Skin and eyes are vulnerable without protection. Ensure you always take precautions. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise.