Affective forecasting (AF), the ability to predict one's future feelings, is important for decision making. We posit that AF entails the ability to maintain and evaluate an emotional feeling state, and thus requires affective working memory (AWM; Mikels & Reuter-Lorenz, 2019). To test this hypothesis, a series of studies investigated whether individual differences in AWM are related to AF ability. In the first study, we document that measures of AWM and AF are positively related, whereas an analogous measure of visual working memory is unrelated to AF in separate groups of participants. Two further within-group studies (1 preregistered) demonstrate that maintenance of affective information predicts AF performance, whereas maintenance of brightness information does not. Further, 2 additional measures of visual working memory (Corsi block-tapping and change detection) did not independently predict AF ability. Taken together the results demonstrate a reliable and selective relationship between AWM and AF, suggesting that AWM is a separable working memory subsystem and an elemental capacity that contributes to the type of higher-order emotional processes involved in AF. (PsycInfo Database Record (c) 2021 APA, all rights reserved).