Several Pima varieties were plant mapped and monitored for plant water status during periods of relatively high daytime peak temperatures during 4 different growing seasons. Daytime high peak temperatures of over 108F were considered to qualify as high peak temperatures for this study. Three irrigation treatments were imposed, producing relatively mild leaf water potentials (-1.9 to -2.0 MPa), moderate (-2.1 to -2.25 Mpa) or more severe water deficits (-2.3 to -2.6 MPa leaf water potential) during the high temperature periods. The duration of high temperature periods ranged from a minimum of 4 consecutive days occuring one time during the growing season to durations of over two weeks of high daytime temperatures, to one season with repeated periods of 4-5 days of high temperature peaks. Leaf growth responses to water stress and high daytime temperatures and impacts on fruit retention will be described.