Your winter temperatures are good growing temperatures for the semps and jovis (those temps are considered prime growing temps during out springs here), so I think you will want to give them a chance to grow for you then. Rain and cool temps should not be much of a problem during your winter, but you are likely looking for a location and strategy for the spring floods. As long as the plants are getting some regular rain during the winter, you do not have to worry much about the winds. This becomes a problem when the temps get below freezing and the plants don't get any moisture for a long period of time, not what you are describing. That was my primary concern when I suggest putting the plant pots on the ground
I think that your main concern will be the spring rains and flooding. Semps and jovis can handle a lot of water for brief periods of time, but flooding or sitting in water for any long period of time will likely cause problems.
Very fast draining soil mixes in taller pots will help situations where there is a lot of rain (a wick in the pot that extends out the bottom of the pot will also help), but a rain shield may be a smart move. We all have plant losses from time to time. While it hurts to lose plants, the satisfaction of solving problems and learning to overcome these kinds of challenges is one of the things that makes gardening worthwhile and satisfying.
