Riyadh
Saudi Arabia
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Riyadh, Saudi Arabia

A view of the Olaya street metro construction and cars in a traffic jam in the city of Riyadh, Saudi Arabia, viewed from above, at night
A view of the Olaya street metro construction and cars in a traffic jam in the city of Riyadh, Saudi Arabia, viewed from above, at night
September, the first month of the autumn, in Riyadh, is still an extremely hot month, with average temperature fluctuating between 25.9°C (78.6°F) and 40.4°C (104.7°F).

Temperature

In Riyadh, the average high-temperature slightly decreases, from an extreme hot 43.6°C (110.5°F) in August, to a still scorching 40.4°C (104.7°F). In Riyadh, the average low-temperature is 25.9°C (78.6°F).

Humidity

The average relative humidity in Riyadh, Saudi Arabia, is 14%.

Rainfall

In Riyadh, Saudi Arabia, rain does not fall in June, July and September.

Daylight

The average length of the day in Riyadh, Saudi Arabia, is 12.3h.

Sunshine

In Riyadh, the average sunshine in September is 9.1h.

UV index

In Riyadh, the average daily maximum UV index in September is 11. A UV Index of 11, and more, symbolizes an ultimate health vulnerability from unsafe exposure to the UV radiation for average individuals.
In September, the average maximum UV index of 11 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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.

What is the temperature in September in Riyadh?

In Riyadh, in September, the average high-temperature is 40.4°C (104.7°F), and the average low-temperature is 25.9°C (78.6°F).

What is the average humidity in September in Riyadh?

The average relative humidity in September in Riyadh is 14%.

Does it rain in Riyadh in September?

In September, in Riyadh, Saudi Arabia, it doesn't rain. August is the latest month when it rains.

What is the driest month in Riyadh?

June, July and September are months without rainfall in Riyadh, Saudi Arabia.

How many hours of daylight does Riyadh have in September?

In Riyadh, the average length of the day in September is 12.3h.

How many hours of sunshine does Riyadh have in September?

In September, the average sunshine in Riyadh, Saudi Arabia, is 9.1h.

What is the UV index intensity in September in Riyadh?

The average daily maximum UV index in September in Riyadh, Saudi Arabia, is 11. A UV Index value of 11, and more, symbolizes an excessive health risk from unprotected exposure to the UV radiation.
Average temperature in September - Riyadh, Saudi Arabia
  • Average high temperature in September: 40.4°C

The warmest month (with the highest average high temperature) is August (43.6°C).
The month with the lowest average high temperature is January (20.2°C).

  • Average low temperature in September: 25.9°C

The month with the highest average low temperature is July (29.3°C).
The coldest month (with the lowest average low temperature) is January (9°C).

Average humidity in September - Riyadh, Saudi Arabia
  • Average humidity in September: 14%

Months with the highest relative humidity are January and December (47%).
The month with the lowest relative humidity is July (10%).

Average rainfall in September - Riyadh, Saudi Arabia
  • Average rainfall in September: 0mm

The wettest month (with the highest rainfall) is April (23.8mm).
Driest months (with the lowest rainfall) are June, July and September (0mm).

Average rainfall days in September - Riyadh, Saudi Arabia
  • Average rainfall days in September: 0 days

The month with the highest number of rainy days is April (11.3 days).
Months with the lowest number of rainy days are June and September (0 days).

Average daylight in September / Average sunshine in September - Riyadh, Saudi Arabia
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.7h).
The month with shortest days is December (Average daylight: 10.6h).

  • Average sunshine in September: 9.1h

The month with most sunshine is June (Average sunshine: 10.9h).
Months with least sunshine are January and December (Average sunshine: 6.9).

Average UV index in September - Riyadh, Saudi Arabia
  • Average UV index in September: 11

Months with the highest UV index are April, May, June, July and August (UV index 12).
The month with the lowest UV index is December (UV index 5).