  In this paper, we examine the relationship between solar activity and extreme
rainfall events in Kerala, India. Kerala receives minimum and maximum rainfall
during the winter and monsoon seasons, respectively. Sunspot number, F10.7
Index, and cosmic ray intensity are the solar indices considered and their
variations with rainfall were studied over a period of 57 years (1965-2021),
i.e., starting from Solar Cycle 20. For each solar cycle, correlative studies
are performed and correlation coefficients are calculated. We find that
rainfall in Kerala is correlated with sunspot activity, but with varying
degrees of significance. During Solar Cycle 21, rainfall and solar activity are
correlated with high significance during both winter and monsoon seasons. The
variation of different solar indices with rainfall is studied. The winter
season showed a better link between the sun and rainfall than the monsoon
season. The years with rainfall surplus and deficiency are calculated and
compared with the solar indices. We find that the years with rainfall excess
and deficit mostly occur in the years around solar maximum or minimum (within
$\pm$2 years). We hypothesise a physical relationship between solar activity
and extreme rainfall events in Kerala that contributes to their predictability.
