The weather is bad. On the day that you planned to take some nature images outside. Why “bad” weather should keep you away from photographing some nature? Even in rainy or misty weather you can take good shots. Clients are not only looking for sunny images.
So go out and try to capture the world in unregular scenes. Take some images of the forest when there is mist. It will create a mystic atmosphere. Go to your garden when it rains and take some macro shots of the environment in wet condition. You can always take your umbrella if you need ;).