Yes, Betta can operate in cloudy weather and rain, as they are fully waterproof and designed for outdoor conditions. Cloudy or rainy days may reduce solar charging efficiency, which can shorten runtime. When there is sunlight, Betta charges continuously through its solar panel while cleaning the pool. Betta cannot charge at night, but if it has enough stored power from daytime charging, it may continue operating until the battery is depleted. Depending on the model, a full charge allows Betta to clean continuously for up to 30+ hours. For extended cloudy or rainy periods, Betta SE Plus features dual charging, allowing you to charge the unit with a wall adapter so it can continue operating even when sunlight is limited.