Saudi Arabia's National Center for Meteorology (NCM) issued red alerts for heavy rain and possible flash floods across parts of Asir and Makkah on Monday, as moderate to heavy thunderstorms were forecast across several regions of the Kingdom.

In Asir, the red alert covers Al-Harajah, Al-Farshah, Sarat Abidah and Dhahran Al-Janub from 12 p.m. to 9 p.m.

Meanwhile, a red alert was issued for Rabigh, Madrakah and Huda Al-Sham in Makkah Region from 1 p.m. to 9 p.m.

Both alerts warn of strong winds, near-zero horizontal visibility, hail, flash floods and thunderstorms.

According to the NCM's Monday forecast, moderate to heavy thunderstorms capable of triggering flash floods are expected across parts of Jazan, Asir, Al-Baha, Makkah, Madinah, Hail, Tabuk, Al-Jouf and the Northern Borders. The storms may be accompanied by hail and strong winds that stir up dust and sand.

Light to moderate rainfall is also forecast over southern parts of Riyadh and the Eastern Province, as well as areas of Najran.

Fog may develop overnight and during the early morning over coastal areas of Tabuk, Madinah, Makkah and the Eastern Province.

Saudi Arabia Weather Forecast: Expected Temperatures

Dammam is forecast to record the highest temperature at 41°C, followed by Makkah and Madinah at 40°C.

Buraidah is expected to reach 38°C, while Riyadh and Jeddah are forecast to record 37°C. Tabuk, Hail and Jazan are expected to reach 36°C.

Sakaka is forecast to record 33°C, followed by Arar and Najran at 32°C. Abha is expected to reach 26°C, while Al-Baha is forecast to record 25°C.

Humidity Levels Across Saudi Cities

Humidity is forecast to reach 90 percent in Dammam and 85 percent in Jeddah, Abha, Al-Baha and Jazan. Makkah and Tabuk are expected to record humidity levels of 80 percent, while Arar and Sakaka may reach 75 percent.

Humidity is expected to reach 65 percent in Hail and Najran, 60 percent in Madinah, 35 percent in Riyadh and 30 percent in Buraidah.