In the red sea coral reef, the water gets no colder then 18 degrees celcius. The temperture of the water is a result of two distint monsoon seasons; northeasterly, and southwesterly. The red sea is the warmest and saltiest body of seawater in the world. The average temperture of the water in the summer is 26 degrees celcius. The amount of rain that the red sea sees in a year is very low, about 2.36 inches.