Eamonn Holmes and Ruth Langsford will take over the presenting duties from Phillip Schofield and Holly Willoughby on Mondays to Thursdays, while a selection of rotating guests will fill in on Fridays.
"Just because some of the audience go on holiday at this time of year it doesn't mean their favourite shows should too - and if the British summer lives up to its reputation then we'll have more people indoors watching us than ever before!" said Holmes.
Langsford added: "Summer should be a happy time and we think we've got the programme to make it just that."
Strictly duo Russell Grant and Flavia Cacace will be offering Latino workouts to help viewers get fit, while Big Brother host Brian Dowling will be fronting a Dream Dates segment to aid singles looking for love.
Britain's Got More Talent host Stephen Mulhern will be showcasing hidden talents in an End of the Pier feature, while Abbey Clancy returns to the daytime show to look at summer fashion trends and more Hunks in Trunks.
Other guests across the summer in the kitchen studio and in The Hub will include TOWIE's Gemma Collins, Britain's Got Talent's The Showbears, Rusty Lee and Lisa Faulkner.
This Morning Summer kicks off on Monday, July 16.