The main objective of this study was to identify causes and perceived effects of rainfall variability on access to water in Baringo County. The study used a descriptive survey design. Purposeful sampling and stratified proportionate random sampling procedures were used to obtain the sample. A total of 376 households were selected for the study. Questionnaire, key informant interview schedule and observations were the main instruments of data collection. Analysis of data was done using the Statistical Package of Social Sciences (SPSS). Descriptive statistics were used to analyze the effects and causes of climate change in Baringo County. Rainfall variability affected access to water in Baringo County. More frequent and severe droughts were perceived to be responsible for the reduced water level in Lake Baringo and intermittency of most rivers that were previously permanent. Deforestation is the main cause of rainfall variability in Baringo County hence there is need to increase awareness on climate variability and change and encourage people to use alternative sources of energy and plant trees.