Abstract: In order to nowcast the lowest temperature correctly, and then provide early freeters’ freezing injury to famers, the author analyzed the correlation between the temperature difference of annual lowest temperature and the temperature at 8:00 pm of the same night and the weather condition of that night, estimated the range of temperature dropping of that night, and finally got the lowest temperature of the next day. The analysis of data of more than 50 years of Fuqing showed that: (1) the temperature difference of annual lowest temperature and the temperature at 8:00 pm of the same night had the closet correlation with the relative humidity of the same time, so the relative humidity at 8:00 pm could be used to estimate the temperature dropping, then combined with the temperature at 8:00 pm, the lowest temperature of the next morning could be predicted. (2) By analyzing the difference of low temperature between the temperature of primary observation station and the temperature of different automated observation station installed in different towns, the lowest temperature of respective towns could be predicted. If the predicted low temperature was lower than the freezing injury index of local principle fruiters and crops, the fruit growers and farmers could be informed the freeze-proofing measures which included sprinkling irrigation and fumigation, the freezing injury caused by low temperature could be avoided or be mitigated. The study could be an additional tool for nowcasting, could enhance the ability of low temperature prediction, and provide the freezing injury mitigation basis for the fruit growers and farmers.