The Šibenik region is directly exposed to the sun's rays, and is among the sunniest parts of Croatia.
The maritime influence on the Krka River valley penetrates deep inland, and significantly impacts the climatic regime in the upper river course and at the springs.
Further inland from the mouth, the maritime influence is weakened; as such, the mean annual air temperature at Šibenik is about 15oC and only 13oC at Knin. The mean air temperature in the coldest month (January) is about 7oC at Šibenik and 5oC at Knin, while in the hottest month (July) it is about 25oC at Šibenik and 23oC at Knin. The highest air temperature ever recorded was 39.2oC at Šibenik and 39.6oC at Knin, while the lowest air temperature recorded was -10.2oC at Šibenik and -18.3oC at Knin. Just over 100 clear days and about 90 cloudy days can be expected per year.
The Šibenik area receives about 2600 hours of sunshine per year, while the Knin area receives about 2400 hours, and these are among the sunniest parts of Croatia. The annual amount of precipitation is about 809 mm in Šibenik and about 1078 mm in Knin, with the majority of precipitation falling during the colder part of the year from October to February. The least precipitation falls in summer, particularly in July, when only about 30 mm falls in Šibenik and 46 mm in Knin. Snow is a rare occurrence in this area, particularly in the coastal area. The mean relative humidity is 57% in Šibenik and 67% in Knin.
During the colder part of the year, the Krka River valley is exposed to north-easterly (bora) and south-easterly (scirocco or jugo) winds, where the bora wind is prevalent throughout the entire area, while the jugo wind usually only blows in the lower course of the Krka River. In summer, a gentle, daytime westerly (mistral) or south-westerly breeze develops on clear days.