The organisers of this year's air day at RNAS Yeovilton in Somerset are expecting big crowds - and no clouds.
Around 40,000 people will have a perfect view as 30 types of aircraft take to the skies on Saturday.
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A cloudy night will have drizzly spells throughout and into the early hours.
It will be a largely cloudy night with outbreaks of light rain. There will also be some hill fog.