The Andean zone has great relevance due to its ecosystems and agroecosystems that provide economic and environmental services to the most populated zone of the country. El Nino, La Nina and the South Oscillation (ENSO) have a prominent influence in the hydro-climatology of the Colombian tropical Andes. This study estimates the relationship between the Pacific Sea Surfaces Temperatures (SSTs) in the region known as El Nino 3,4, measured in the Ocean Nino Index (ONI) and the monthly rainfall in the Colombian Central Andes. Forty-one-year historic monthly rainfall series for ten weather stations located between latitudes 03o 49’ N to 05o 58’N, along the three Colombian mountain chains were used. Statistically significant lineal relations (P <0,01 and P<0,05) between PSST and ONI were found for December, January, February, June, July, August and September, which are historically considered as the “dry” months. The Central mountain chain exhibits the greatest number of months with meaningful lineal relationships between PSST and ONI.