Key weather averages for Jamaica in February. 1  29. 29°C max day temperature. 2  8. 8 hours of sunshine per day. 3  6. 6 days with some rainfall. 4  20. 20°C min night temperature. 5  12. 12 hours of daylight per day. 6  M. 7  69. 69 mm of monthly rainfall. 8  10. 10 (Very High) UV index. 9  27. 27°C sea temperature.