Jelly fish are very common in Hawaii, mostly on our south and west shores; and they usually appear 8-10 days after a full moon. The dates below are only estimated dates of arrival by trusted and informational sources. Always use caution when going out in the ocean, and heed the posted signs on the beach and lifeguards warnings. January Dates January 30 2008 January 31 2008 February Dates February 1 2008 February 29 2008 March Dates March 1 2008 March 2 2008 March 30 2008 March 31 2008 April Dates April 28 2008 April 29 2008 April 30 2008 May Dates May 28 2008 May 29 2008 May 30 2008 June Dates June 27 2008 June 28 2008 July Dates July 26 2008 July 27 2008 July 28 2008 August Dates August 25 2008 August 26 2008 September Dates September 23 2008 September 24 2008 September 25 2008 October Dates October 23 2008 October 24 2008 November Dates November 21 2008 November 22 2008 November 23 2008 December Dates December 21 2008 December 22 2008