“They say there is a difference between actual temperature and perceived temperature, but in the “bearable heaviness of being” the actual measure is no doubt the weight we perceive.”

Source: School's Out—Forever

Source: Vestiges of the Natural History of Creation (1844), p. 30

This actually first appears in Recent Experiments in Psychology (1950) by Leland Whitney Crafts, Théodore Christian Schneirla, and Elsa Elizabeth Robinson, where it is expressed:
: If we used a different vocabulary or if we spoke a different language, we would perceive a somewhat different world.
Randy Allen Harris, in Rhetoric and Incommensurability (2005), p. 35, and an endnote on p. 138 indicates the misattribution seems to have originated in a misreading of quotes in Patterns Of Discovery: An Inquiry Into The Conceptual Foundations of Science (1958) by Norwood Russell Hanson, where an actual quotation of WIttgenstein on p. 184 is followed by one from the book on psychology.
Misattributed

Source: Cosmos

Source: Ark Angel

as quoted by George Porter in the preface of [But the Crackling is Superb, An Anthology on Food and Drink by Fellows and Foreign Members of the Royal Society, Institute of Physics Publishing, London, UK, 1988, 0-750-30488-X, xvii]

Source: The Cardturner: A Novel about a King, a Queen, and a Joker