There are a number of different ways of referrig to the future in English. It is important to remember that we are expressing more than simply the time of the action or event. Obviously, any 'future' tense will always refer to a time 'later than now', but it may also express our attitude to the future event.
All of the following ideas can be expressed using different tenses:
a. Simple prediction
c. Plans and intentions
d. Time-table events
e. Prediction based on present evidence
g. An action in progress in the future
h. An action or event that is a matter of routine
j. An action or event that will take place immediatelly or very soon
k. Prejecting ourselves into the future and looking back at a completed action.
The example sentences below correspond to the ideas above:
a. There will be snow in many areas tomorrow.
b. I´m meeting Jim at the airport.
c. We´re going to spend the summer abroad.
d. The plane takes off at 3 at a.m.
e. I think it´s going to rain!
f. We´ll give you a lift to the cinema.
g. This time next week I´ll be sun-bathing.
h. You´ll be seeing John in the office tomorrow, won´t you?
i. You are to travel directly to London.
j. The train is about to leave.
k. A month from now he will have finished all his exams.
It´s clear from these examples that several tenses are used to express the future.