Water temperatures range from the low 70s F (about 22 Celsius) in January and February, to the low 80s F (about 30C) in August and September. A full 2mm wet suit is likely to be adequate for most people. In summer, I am comfortable in a T-shirt.

There is an overall westerly movement of water around the Hawaiian islands. This is modified locally, particularly by tidal currents. The difference between high and low tide is approximately 2 feet (0.6m). Tidal currents can sometimes move faster than people can swim, so it is a good idea to consult tide tables before diving.

If you are planning on doing a lot of shore diving, it is also worth noting that in winter, it is quite common to have long periods of high surf, particularly on the north and west shores, which make shore diving entries and exits more difficult, and sometimes impossible.

Glenn James weather report and sea conditions for divers.
Marine Forecast 877-3477
Maui Recreational Forecast 871-5054 & 877-5111

Average Temperatures

(After 'Exploring Tropical Isles and Seas' by Frederic Martini)


Air Temp
C (F)
Sea Temp
C (F)
Wind
Dir
Swell
Dir
Jan
21.7 (71)
22.8 (73)
NE
NE
Feb
21.7 (71)
22.8 (73)
NE
NE
Mar
22.2 (72)
23.3 (73.9)
ENE
NE
Apr
22.8 (73)
24 (75.2)
ENE
NE
May
23.9 (75)
25.2 (77.4)
ENE
-
Jun
25 (77)
26.4 (79.5)
ENE
-
Jul
25.6 (78)
26.4 (79.5)
E
SW
Aug
25.6 (78)
26.8 (80.2)
E
SW
Sep
25.6 (78)
26.7 (80.1)
ENE
-
Oct
25 (77)
26.3 (79.3)
ENE
-
Nov
23.9 (75)
24.9 (76.8)
ENE
-
Dec
22.8 (73)
23.2 (73.8)
ENE
NE