Last year was a record year for jellyfish in British waters, according to scientists at Exeter University who keep track of the sightings.
This year there are unusual numbers of the barrel jellyfish. Its thought the mild winter has allowed more of them to survive.
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A minute's applause will take place during the Army-Navy rugby match in memory of Captain David Seath, who died during the marathon.
RNLI lifeguards will start patrolling beaches in the region this weekend as the 2016 summer season get underway.
People living in Totnes are celebrating after winning their three year legal battle, against the controversial traffic system