Posted: 26/04/2016 at 17:14
Is the grass in shade Shane ? That's the most common cause of moss, especially if you have trees or large shrubs nearby. The rain has nothing to do with the creation of moss or thatch. Also, if the ground's compacted and has poor drainage it will tend to prevent good grass growth.
If you can resolve any of those issues ( if you have them ) that will help, but as the others have said, the weather hasn't been conducive to good germination and growth, so don't worry too much. If you leave it a few weeks, new seed sown then will come away quickly