Well 8 inches of rain in a month sounds like a lot, but it depends on how it was distributed ( a quarter of an inch of rain every day all month? 4 inches of rain in one day and then no more for two weeks?) and what the weather was like in between (hot and sunny?) and what your soil is like.
Both your soil and your poor plant look totally dried out and your plant looks like it is thirsting to death. Jeff is right that over-watering can cause wilting also, but usually has yellowing with it. There's an easy test. Go out in the morning and pour a gallon of water slowly on the soil around your plant and then wait a few hours. If the plant perks up, that was what it needed.
If so, then continue watering until all the soil around it is well moistened at least four inches deep. Water what you think is a lot and then dig down with your trowel to see how far down the soil is damp. I bet you will be surprised that it isn't very much. After you have thoroughly moistened the soil, then mulch over it with several inches of organic mulch. This will help keep the water in.