Astrology always tells possibilities and probabilities, some events and experience have a more than 90% probability of occurrence and rest have lesser.
Since its a study of time and its relation to Nature (Planets and Zodiac signs representing combinations of Tri Gunas, Sattva, Rajas and Tamas), it can be wisely used to gain more awareness of what lies ahead and wise decisions could be made on the basis of that.
This is helpful in various spiritual pursuits and to have a better and harmonious life.