The recommendation lists below includes titles/authors at somewhat varied reading levels. Parents/students are encouraged, however, to look at the lists for the grade levels above and below the target grade.
For more recommendations, see School Library Journal's Summer Reading 2021. They did not make a 2022 version but this one still has some great recommendations.
Non-Fiction Series/Authors
DK Level 3 Readers (series)
Who Is/Who Was (Mostly biographies)
Magic School Bus (series) – Joanna Cole & Bruce Degen
Magic Tree House Fact Trackers - Mary Pope Osborne
Gail Gibbons
Steve Jenkins
Seymour Simon – some titles
Fiction Series
Spiderwick Chronicles – Tony DiTerlizzi
Mallory – Laurie Friedman
My Weird School – Dan Gutman
___ Story Treehouse – Andy Griffiths
Katie Kazoo – Nancy Krulik
Judy Moody / Stink – Megan McDonald
Puppy Place – Ellen Miles
Magic Tree House – Osborne
A-Z Mysteries – Ron Roy
Marvin Redpost – Louis Sachar
Wayside School – Louis Sachar
Frank Einstein – Jon Scieszka
Cupcake Diaries – Coco Simon
Geronimo / Thea Stilton
Marty Frye, Private Eye – Janet Tashjian
Authors
Judy Blume
Betsy Byars
Matt Christopher
Beverly Cleary
Kate Di Camillo
Dan Gutman
Brian Pinkney
Patricia Polacco