The present disclosure relates to a holding device (1) for holding a weather-protection sheet (90) in a rolled-up position. The holding device (1) comprises a body (2), which can be mounted on a supporting cable (92) for the protection sheet (90), and an elongated flexible member (3) having a first portion (31) fixed to the body (2). The flexible member (3) can assume a first condition, in which the flexible member (3) is substantially outstretched, and a second condition, in which the flexible member (3) is bent substantially like a ring. A seat (25) is made in the body (2) and is adapted to receive a second portion (32) of the flexible member (3) when the flexible member (3) is in the second condition. The holding device (1) further comprises a locking element (4) that is mounted on said body (2) and is movable between a locking position and a release position, to reversibly lock the second portion (32) of the flexible member (3) in the seat (25). The flexible member (3) in the second condition is adapted to encircle and hold the rolled-up protection sheet (90), whereas the flexible member (3) in the first condition is adapted to let the protection sheet (90) free. The present disclosure relates to a weather-protection system (9) as well.
