The rain clouds hovering over most of Japan are not just drenching people -- they are also blighting the earnings outlook for corporate Japan.

From breweries to amusement parks and air conditioner retailers, a plethora of businesses that count on the scorching summer sun have taken a beating during this year's prolonged rainy season.

This could put a brake on the nascent economic recovery seen in recent months -- although some other firms are praying for the heavens to open.