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Abstract: A technique is presented in which satellite solar insolation estimates are used to predict daily reference evapotranspiration (ETo) using the Penman-Monteith (PM), Preistly-Taylor (PT) and Hargreaves-Samini (HS) methods for Puerto Rico. For this approach, average, minimum and maximum daily air temperatures were obtained from a regression procedure that depends on surface elevation and day of the year. The air temperature was adjusted using actual daily temperatures from several locations in PR. Dew point temperature was assumed to be equal to the daily minimum temperature, and a value of 1.9 m/s was assumed for wind speed. As an example, ETo was estimated for March 5, 2009 using the three methods, with the Penman-Monteith method producing the lowest values. This research represents a preliminary step in the development of an ETo product for PR. This product is a potentially valuable tool for conducting water resource studies and for supporting irrigation scheduling efforts.