Research has shown that favorable weather is associated with increased tipping and that beliefs that weather is favorable can produce higher tips. In the current study, the possibility that beliefs about future weather conditions would affect tipping was experimentally examined. A server in a midscale restaurant wrote on the back of customers’ checks either nothing, that the weather would be good the next day, or that the weather would not be so good the next day. Compared to writing nothing (M= 18.73%) or giving an unfavorable forecast (M= 18.18%), giving a favorable forecast (M= 22.21%) resulted in significantly higher tip percentages. The power of beliefs, irrespective of their veridicality, regarding the state of atmospheric conditions in affecting human response is discussed.