樓主,這個情形“太陽雨”簡稱為“Sunshower",有時也作”Sun Shower".
此外,為了解釋“太陽雨”這個現(xiàn)象,樓主可以有以下幾種說法：-
1.Rainy Day In The Sun
2.The Sun Comes Out On A Rainy Day
3.Rain falls while the sun is shining
樓主也可參考以下鏈接,并見以下的解釋：-
"Not found in most dictionaries,the sunshower is a common weather phenomena in which rain falls while the sun is shining outside.This phenomenon is referred to as a “sunshower” in many countries including Canada and the United States."