Simple future (Future I)

Simple future (Future I) vs present

The Simple future (Future I) has basically the same meaning as the present tense, when the latter is used with a future meaning. However, comparing the two tenses, the simple future expresses less certainty regarding the realization of the future event.  

When using the present tense with a future meaning, it is adviseable to use a word that determines the time that the event takes place i.e. future time.