Over 175 millimetres of rain was recorded at Valentia Observatory last month.
Statistics from Met Eireann show this was up from almost 150 millimetres in February.
It was also a much wetter March compared to the same month in 2018 when 130 millimetres of rain fell.
The average rainfall for March at the south Kerry weather station is 124 millimetres.
Meanwhile, the average temperature was 8.1 degrees compared to 5.7 degrees in March 2018.