Campers joined police to search through the night for the missing boy, who was last seen at a campsite at Thistledown Farm in Nympsfield, near Stroud at around 7pm last night.
Police said a more extensive hunt was due to start as daylight breaks.
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There will be strong winds and frequent showers with possible hail.
Sunny spells and frequent, blustery showers, mixed with sleet and hail at times.
The seaside town of Dawlish has been branded the bossiest in Britain after a review said its signs were creating a 'Big Brother' atmosphere