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.
Nonfiction Titles/Authors
National Geographic Readers
Fly Guy Presents… -- Tedd Arnold
Gail Gibbons
Steve Jenkins
Fiction Series
Arthur – Brown (E and FIC - early chapters)
Strega Nona – Tomi DePaola
Owl Diaries – Rebecca Elliott (FIC)
Princess in Black – Shannon Hale (FIC)
If You Give a … – Numeroff
Henry and Mudge – Rylant
Nate the Great – Sharmat
Max and Ruby – Wells
Piggy and Elephant – Mo Willems
Authors
Mac Barnett
Jan Brett
Eric Carle
Lois Ehlert
Kevin Henkes
Lio Lionni
Peter Reynolds
Dr. Seuss
Judith Viorst
Mo Willems