Anything offshore happens out at sea and when you're talking about the wind, offshore means it's blowing toward the land.
From the shore;
Adjective
(of winds) coming from the land; "offshore winds"
Adjective S.
at some distance from the shore; "offshore oil reserves"; "an offshore island"
Adverb
away from shore; away from land; "cruising three miles offshore"
a.
From the shore; as, an offshore wind; an offshore signal.
Offshore
From the shore;
Usage Examples
People always underestimate the impact of technology. To give you an example: In the 1970s the frontier for offshore development was 200 meters, today it is 4,000 meters.
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Other Usage Examples