The spring period saw visitors to Guernsey rise by 6.2% over the same April to June quarter in 2014.
The positive second quarter spells a good year for tourism to the island overall, according to VisitGuernsey.
There was an overall increase in staying visitors of 6.5% to 102,000 in the first six months of the year, including a 3.2% rise in UK arrivals to 91,800.
The tourist board attributed the improvement in part to its first TV advertising in ten years which aired throughout February.
The first pan-island Channel Islands Heritage Festival took place throughout April and May, which is also thought to have been a driver for visitors.
Mike Hopkins, marketing and tourism director at VisitGuernsey, said: “It’s encouraging to see this growth, especially in the number of bed nights sold and positive staying visitor numbers.
“Our local tourism industry, the trade and VisitGuernsey worked extremely hard to promote a very successful Channel Islands Heritage Festival and the 70th anniversary of Liberation celebrations which, supported by our new TV ad campaign, we believe helped to boost visitor numbers during Q2.
“The current peak season is shaping up well, and we are now promoting the Guernsey International Food Festival to help boost visitor numbers during the latter part of the season.”