Dammam usually retains its warm temperature even through winter which ranges from 10°C to 22°C, but the temperature can drop to as low as freezing. Summers are extremely hot and humid and regularly break the 40°C mark, with some days reaching as high as 50°. Rainfall here is sparse; when it does rain, it's usually in December.
What to wear
Women are expected to wear the abaya, a long black over-garment, and men cannot wear shorts. Pack a few jumpers and jackets for winter evenings and the fierce air conditioning you'll find in many places.