He cracked 22 fours and seven sixes, sharing a massive stand of 248 with Luca Roberts (76), also a Hythe record.
Meredith, who won the County 4 batting award with the now defunct Peartree in 2014, became the third double centurion in Hythe’s history.
South African Adrian Greyvenstein made an unbeaten 239 against Amport in 2003 and Mel Hussain, then on the Hampshire county staff at Northlands Road, 205 not out against Southampton University, back in 1983.
Hythe’s previous highest total came two seasons ago when they scored 354 against Bramshaw.
Meredith’s run fest climaxed a fine day for the Jones Lane based Waterside club, who celebrated a four-team Hampshire League win triumph.
Hakim Peruzi hit an unbeaten 76 in the first team’s three-wicket win over Hook & Newnham Basics II, Luke Mills struck a maiden 111 for the thirds against Brockenhurst, while an undefeated 98 from Paul Toon got the fourth’s home against Burley II.