The storm, which is the first to be named by the Met Office this season, will hit the UK from late Friday night and into Saturday.
Weather warnings have been issued for Northern Ireland and parts of south-west Britain.
A spokesman from the Met Office said that although the weather warning does not extend to Norfolk, there will still be thundery conditions.
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The storm will move in from the west, with rain starting in the early hours of Saturday and building throughout the day.
It will also be very windy, with strong gusts along the coast.
Temperatures will hit highs of 14C but it will often feel more like 12C.
Storm Antoni will mostly clear by Sunday with some isolated showers remaining.
But conditions could bounce back next week with predictions of temperatures in the high 20s by August 10.
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