April in Hong Kong has got off to an unseasonably hot start, with highs of 31 degrees Celsius forecast for Thursday. The temperature on Monday, the final day of the long Easter weekend, reached 29.1 degrees, while the mean temperature was 27.3 degrees, well above the monthly mean of 23 degrees Celsius, according to the Hong Kong Observatory. The highest temperature ever recorded in April was in 1965, when the Observatory logged 33.4 degrees Celsius. Last month, the city saw its hottest March day since records began in 1884, when the maximum temperature measured at the Observatory hit 31.5 degr…