Venus flytraps can do well when grown indoors or outdoors all year round. They can even survive winter frost if they're protected. It’s often recommended that if the winter is very cold outdoor plants should be brought indoors, however. If a plant is growing in a pot or a terrarium, it should be easy to move it.
There are many points to consider about caring for a Venus flytrap throughout the year at different temperatures and about necessary precautions when moving a plant from indoors to outdoors and vice versa. It would be best if you found a book about caring for the plants (perhaps at a library) or a website that specializes in caring for Venus flytraps because there's quite a lot of information to absorb.
At this time of year, it probably doesn't matter whether you keep the plant indoors or outdoors, although since you get a lot of rain you might want to keep the plant in a sheltered area if you leave it outside. As winter approaches, you'll need to make a decision about what to do with the plant based on the expected winter temperatures in your part of the world. It will either need to be protected outside or brought inside. The book or specialist website that you explore should help you make a decision.