Bouy 42001-Mid Gulf Buoy is closing the gap on the maximum sea temperature set during the years Aug. 1975 to Dec. 2001.
Previous June record was 32.1C (89.78 F) on June 29th, 1994 at 21Z.
The current June maximum is 31.7C (89.06 F) on June 19th.

2008 06 19 22 50 50 1.0 2.0 0.4 8 5.0 MM 1012.3 29.9 30.7 23.3 MM -1.3 MM
2008 06 19 21 50 140 1.0 2.0 0.4 7 5.1 MM 1012.6 29.7 31.7 22.8 MM -1.5 MM
2008 06 19 20 50 MM 0.0 1.0 0.3 8 4.8 MM 1013.2 29.6 30.9 21.9 MM -0.8 MM

http://www.ndbc.noaa.gov/station_page.php?station=42001&unit=M&tz=STN
http://www.ndbc.noaa.gov/data/climatic/42001.pdf
http://www.ndbc.noaa.gov/data/realtime2/42001.txt

Maximum Sea Temperature during the period of record, 1975 to 2001, was 33.1 (91.58 F) on July 22, 1996 at 21Z.