This study analyzed daily rainfall probabilities and its persistence at Fukuoka for 78 years (1890～1967). Here, a rainy day is defined by the daily rainfall when it is over 0.1 mm. The results are as follows: 1. The longest rainy sequence is 23 days and the longest dry sequence 30 days. 2. The daily rainfall occurrence is closely fitted by the third order Markov chain model. 3. The persistence of daily rainfall occurrence is quite evident, and the forecast value of it for one or two day period is significant. 4. The probability of at least one rainy day is 0.79～0.95, in a 5-day period and 0.94～0.99 in a 10-day period.
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