I do know that the thyroid has an easier time in the summer, so that could explain things. People taking replacement thyroid hormone need less in the summer than in the winter, and generally feel better all round - better mood, more energy, warmer etc. Thyroid levels and the immune system are inextricably linked, so your immune system might be fighting the candida more effectively in the summer.

Vitamin D and the sunshine also help the immune system, so that could be playing a part too.

Best

Nicola