The average temperature in Montpellier the average temperature is 34.73 degrees in summer, with precipitation around 6.0 mm , Lihue - Kauai Island, HI's temperatures reach 30.44 during the hot season, with 6.0 average of rain rate . In winter, however, weather indicators show around 12.83 degrees in Lihue - Kauai Island, HI, compared to the -2.36 average degrees reported in Montpellier. During the winter period, Montpellier can register 3.0 mm precipitation, while Lihue - Kauai Island, HI have an average of 6.0 mm rain level.