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As Arjen indicates any sort of accurate prediction requires long term records of rainfall and groundwater level. Even then, a direct correlation is likely to be impossible though a general relationship may emerge with a likelihood of high groundwater levels following a heavy rainy season with a lag of months between the peak rain and the highest groundwater level. The Food and Agricultural Organisation has also worked with community level data collection to establish a relationship for resource allocation. Long term rainfall records may be available locally from an airport, agricultural research station, school or mission but groundwater records are likely to be patchy at best. It is difficult to get clear groundwater levels from a well or borehole that is in use for water supply. Where there are sufficient resources, dedicated observation boreholes are drilled but this is unlikely to be the case in your area.