Dammam has an arid climate under the Köppen climate classification. Unlike other Saudi Arabian cities, Dammam retains its warm temperature in winter, which can range from +10 °C (59 °F) to +22 °C. However the temperature regularly drops to as low as around 0 °C some days. Summer temperatures are very hot and break the 40 °C (104 °F) mark and on some days the 50 °C mark. Though average summer temperatures usually lie between 40 °C to 45 °C.
Rainfall in Dammam is generally sparse, and usually occurs in small amounts in December. Though some winters rainfall has been comparatively heavy resulting in water logged roads. There have also been several notable incidents of hail. Heavy thunderstorms are not uncommon in winter. (The thunderstorm of December 2008 being the largest in recent memory, with rain reaching around 3 inches.)
Some unusual events often happen during the year, such as dust storms in summer, coming from the Arabian Peninsula's deserts or from North Africa