Hello,
I think among the forum members there're definitely people who like gathering mushrooms in autumn. In Russia this is one of the favorite activities of many people especially older ones. We believe that there are some days when mushrooms in forests grow more rapidly than usual. These are the days when the sun is shining and it's raining simultaneously. We have a specific word for such a rain: "Mushroom raining". Do you use any idiomatic expression in English to describe a rain like this? Maybe "sunshower"?
Thanks
Sunshower (sun shower):
"In Russian, it is called грибной дождь (gribnoy dozhd'), "mushroom rain", as such conditions are considered favorable to growing mushrooms. It is also often referred to as слепой дождь (slepoy dozhd'}, which literally translates as "blind rain".
Only rarely is there simultaneous sunshine and rain. That's when rainbows are visible.
The nearest equivalent we have to your expression is in the springtime, when showers alternate with warm sunshine. We call this good growing weather.
Rover
Sunshower - Wikipedia, the free encyclopedia
In the US South, it is said that "the devil is beating his wife." Many other expressions from around the world in the linked article.