The main objective of the study was to estimate the solar mean global solar radiation monthly and annual, using extreme temperatures, applying the Bristow-Campbell model to the 19 meteorological stations of the Junín Region, under the responsibility of the National Service of Meteorology and Hydrology of Peru (SENAMHI) and the secondary objectives of calculating the maximum and minimum predicted temperatures through time series. The method used for the estimation of global mean daily solar radiation monthly and yearly was modeling using the empirical model Bristow-Campbell and for the forecast of temperatures was used the time series using the documentary technique of historical data of the website of SENAMHI from the years 2000 to 2015. It was determined seasonal predictive models to predict maximum and minimum temperatures to 2017 of the 19 stations of the Junín Region. With predicted extreme temperatures, global average daily solar radiation was estimated by means of the validated Bristow-Campbell empirical model with recorded data to estimate the coefficient a considering the altitude, obtaining that there are differences between the Sierra and Selva, being in the Sierra the average values at 6 kWh/m2/day and in Jungle 4 kWh/m2/day, both values are profitable for their application with the purpose of producing heat, cold and electricity with solar energy. These results validate the Bristow-Campbell model to reliably estimate monthly average and annual average global solar radiation, using extreme temperatures in the Junín Region-Peru.