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The issue of climate change appears to be on the fore burner and it cannot be ascertained to occur without evidence. Rainfall is one of the climatic factors that can indicate climate change. In this work, the non-parametric Mann-Kendall test is used to test for significant trend in rainfall in Nigeria through randomly selected locations in the six geopolitical zones within a 30 years period (1978-2007). The selected locations are; Maiduguri (13 degrees 10’, 11 degrees 50’) in the North East, Kaduna (7 degrees 27’, 10 degrees 31’) in the North West, Lokoja (6 degrees 45’, 7 degrees 43’) in the North Central, Ibadan (3 degrees 53’, 7 degrees 22’) in the South West, Enugu (7 degrees 30’, 6 degrees 27’) in the South East and Calabar (8 degrees 28’, 4 degrees 57’) in the South South. During the 30 years period, the yearly average rainfalls (mm) were 580.5, 1187.5, 1228.7, 1317.2, 1753.8 and 2925.6, respectively. While the rest of the locations had no significant trend yet Maiduguri showed an increasing trend at a rate of 9.88 mm/year, where formally the trend there from the period 1961-1990 was decreasing. This change could either be a problem or blessing to dwellers in that location and there is need for continuous monitoring.