Spatial and temporal droughts during rainy seasons are important climatic aspects to consider in water resources management. The dry spell index, a time-independent index that considers the characteristic of dry days, dry spell, seasonal length and evaporation rate in drought severity estimation, is supporting the analyses of the spatiotemporal variations of drought severity in the rainy season of the Indonesian Maritime Continent (IMC) between 1998 and 2018. The rainy season was determined using a modified anomalous accumulation. The results showed that an increase in dry spells produced a consistently increasing temporal drought during the rainy season across the IMC. Meanwhile, spatial variation suggested that although there is an increase in the rainy season total accumulated precipitation and duration, a large area within the monsoon regime also experiences increased drought severity, indicating more frequent extreme precipitation. Regional drought severity was classified as normal with a tendency of an increasing area under dry categories. Overall, the rainy season drought has increased in the IMC from 1998 to 2018, elevating the threats of reduced agricultural production.

雨季的时空干旱是水资源管理中需要考虑的重要气候方面。旱期指数是一个与时间无关的指数，在干旱严重程度估计中考虑了干旱天数、旱期、季节长度和蒸发率的特征，支持分析印度尼西亚海事雨季干旱严重程度的时空变化。 1998 年至 2018 年间的大陆 (IMC)。雨季是使用修正的异常累积确定的。结果表明，在整个 IMC 的雨季，干旱期的增加导致时间干旱持续增加。同时，空间变异表明，虽然雨季累计降水总量和持续时间有所增加，季风范围内的大片地区也经历了更严重的干旱，表明更频繁的极端降水。区域干旱严重程度为正常，干旱类别面积有增加的趋势。总体而言，1998 年至 2018 年 IMC 的雨季干旱有所增加，加剧了农业减产的威胁。